Adjust property editors

build.gradle.kts

@@ -1,18 +1,13 @@
 plugins {
     id("ru.mipt.npm.gradle.project")
-
-    //Override kotlin version
-//    val kotlinVersion = "1.5.20-RC"
-//    kotlin("multiplatform") version(kotlinVersion) apply false
-//    kotlin("jvm") version(kotlinVersion) apply false
-//    kotlin("js") version(kotlinVersion) apply false
 }
 
-val dataforgeVersion by extra("0.5.0-dev-2")
+val dataforgeVersion by extra("0.5.0-dev-9")
 val fxVersion by extra("11")
 
 allprojects {
     repositories {
+        mavenLocal()
         mavenCentral()
         jcenter()
         maven("https://repo.kotlin.link")

demo/gdml/src/commonTest/kotlin/space/kscience/visionforge/gdml/GDMLVisionTest.kt

@@ -1,7 +1,7 @@
 package space.kscience.visionforge.gdml
 
 import space.kscience.dataforge.meta.string
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.values.asValue
 import space.kscience.gdml.GdmlShowCase
 import space.kscience.visionforge.setProperty
@@ -24,7 +24,7 @@ class GDMLVisionTest {
     @Test
     fun testPrototypeProperty() {
         val vision = GdmlShowCase.cubes().toVision()
-        val child = vision["composite-000.segment-0".toName()]
+        val child = vision[Name.of("composite-000","segment-0")]
         assertNotNull(child)
         child.setProperty(SolidMaterial.MATERIAL_COLOR_KEY, "red".asValue())
         assertEquals("red", child.getProperty(SolidMaterial.MATERIAL_COLOR_KEY).string)

demo/gdml/src/jvmMain/kotlin/space/kscience/visionforge/gdml/demo/GdmlFxDemoApp.kt

@@ -8,8 +8,8 @@ import space.kscience.dataforge.context.fetch
 import space.kscience.gdml.GdmlShowCase
 import space.kscience.visionforge.VisionManager
 import space.kscience.visionforge.describedProperties
-import space.kscience.visionforge.editor.VisualObjectEditorFragment
-import space.kscience.visionforge.editor.VisualObjectTreeFragment
+import space.kscience.visionforge.editor.VisionEditorFragment
+import space.kscience.visionforge.editor.VisionTreeFragment
 import space.kscience.visionforge.gdml.toVision
 import space.kscience.visionforge.solid.FX3DPlugin
 import space.kscience.visionforge.solid.FXCanvas3D
@@ -29,18 +29,17 @@ class GDMLView : View() {
     private val visionManager = context.fetch(VisionManager)
     private val canvas = FXCanvas3D(fx3d)
 
-    private val treeFragment = VisualObjectTreeFragment().apply {
+    private val treeFragment = VisionTreeFragment().apply {
         this.itemProperty.bind(canvas.rootObjectProperty)
     }
 
-    private val propertyEditor = VisualObjectEditorFragment {
+    private val propertyEditor = VisionEditorFragment {
         it.describedProperties
     }.apply {
         descriptorProperty.set(SolidMaterial.descriptor)
         itemProperty.bind(treeFragment.selectedProperty)
     }
 
-
     override val root: Parent = borderpane {
         top {
             buttonbar {

demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt

@@ -6,6 +6,7 @@ import ru.mipt.npm.muon.monitor.Monitor.UPPER_LAYER_Z
 import space.kscience.visionforge.VisionManager
 import space.kscience.visionforge.removeAll
 import space.kscience.visionforge.root
+import space.kscience.visionforge.setProperty
 import space.kscience.visionforge.solid.*
 import kotlin.math.PI
 

demo/playground/build.gradle.kts

@@ -67,6 +67,7 @@ kotlin {
         val jvmMain by getting{
             dependencies {
                 api(project(":visionforge-server"))
+                api(project(":visionforge-markdown"))
                 api("ch.qos.logback:logback-classic:1.2.3")
                 implementation("com.github.Ricky12Awesome:json-schema-serialization:0.6.6")
             }

demo/playground/src/jvmMain/kotlin/markdownDemo.kt

@@ -0,0 +1,91 @@
+package space.kscience.visionforge.examples
+
+import kotlinx.html.div
+import kotlinx.html.h1
+import space.kscience.dataforge.context.Context
+import space.kscience.plotly.layout
+import space.kscience.plotly.models.ScatterMode
+import space.kscience.plotly.models.TextPosition
+import space.kscience.plotly.scatter
+import space.kscience.visionforge.html.ResourceLocation
+import space.kscience.visionforge.markup.markdown
+import space.kscience.visionforge.plotly.PlotlyPlugin
+import space.kscience.visionforge.plotly.plotly
+import space.kscience.visionforge.solid.*
+
+fun main() {
+    val context = Context {
+        plugin(Solids)
+        plugin(PlotlyPlugin)
+    }
+
+    context.makeVisionFile(resourceLocation = ResourceLocation.SYSTEM) {
+        markdown {
+            //language=markdown
+            """
+                # Section
+                
+                **TBD**
+                
+                ## Subsection
+            """.trimIndent()
+        }
+
+        div {
+            h1 { +"Canvas" }
+            vision("canvas") {
+                solid {
+                    box(100, 100, 100)
+                    material {
+                        emissiveColor("red")
+                    }
+                }
+            }
+        }
+
+        vision("plot") {
+            plotly {
+                scatter {
+                    x(1, 2, 3, 4)
+                    y(10, 15, 13, 17)
+                    mode = ScatterMode.markers
+                    name = "Team A"
+                    text("A-1", "A-2", "A-3", "A-4", "A-5")
+                    textposition = TextPosition.`top center`
+                    textfont {
+                        family = "Raleway, sans-serif"
+                    }
+                    marker { size = 12 }
+                }
+
+                scatter {
+                    x(2, 3, 4, 5)
+                    y(10, 15, 13, 17)
+                    mode = ScatterMode.lines
+                    name = "Team B"
+                    text("B-a", "B-b", "B-c", "B-d", "B-e")
+                    textposition = TextPosition.`bottom center`
+                    textfont {
+                        family = "Times New Roman"
+                    }
+                    marker { size = 12 }
+                }
+
+                layout {
+                    title = "Data Labels Hover"
+                    xaxis {
+                        range(0.75..5.25)
+                    }
+                    legend {
+                        y = 0.5
+                        font {
+                            family = "Arial, sans-serif"
+                            size = 20
+                            color("grey")
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

demo/playground/src/jvmMain/kotlin/serverExtensions.kt

@@ -26,7 +26,7 @@ public fun Context.makeVisionFile(
     content: VisionTagConsumer<*>.() -> Unit
 ): Unit {
     val actualPath = page(title, content = content).makeFile(path) { actualPath ->
-        mapOf("threeJs" to scriptHeader("js/visionforge-playground.js", resourceLocation, actualPath))
+        mapOf("playground" to scriptHeader("js/visionforge-playground.js", resourceLocation, actualPath))
     }
     if (show) Desktop.getDesktop().browse(actualPath.toFile().toURI())
 }

demo/playground/src/jvmMain/kotlin/simpleCube.kt

@@ -2,9 +2,7 @@ package space.kscience.visionforge.examples
 
 import space.kscience.dataforge.context.Context
 import space.kscience.visionforge.html.ResourceLocation
-import space.kscience.visionforge.solid.Solids
-import space.kscience.visionforge.solid.box
-import space.kscience.visionforge.solid.solid
+import space.kscience.visionforge.solid.*
 
 fun main() {
     val context = Context {
@@ -15,6 +13,9 @@ fun main() {
         vision("canvas") {
             solid {
                 box(100, 100, 100)
+                material {
+                    emissiveColor("red")
+                }
             }
         }
     }

demo/sat-demo/src/main/kotlin/ru/mipt/npm/sat/satServer.kt

@@ -8,7 +8,7 @@ import kotlinx.coroutines.launch
 import kotlinx.html.div
 import kotlinx.html.h1
 import space.kscience.dataforge.context.Global
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.Name
 import space.kscience.visionforge.solid.*
 import space.kscience.visionforge.three.server.*
 import space.kscience.visionforge.visionManager
@@ -42,7 +42,7 @@ fun main() {
             val randomLayer = Random.nextInt(1, 11)
             val randomI = Random.nextInt(1, 4)
             val randomJ = Random.nextInt(1, 4)
-            val target = "layer[$randomLayer].segment[$randomI,$randomJ]".toName()
+            val target = Name.parse("layer[$randomLayer].segment[$randomI,$randomJ]")
             val targetVision = sat[target] as Solid
             targetVision.color("red")
             delay(1000)

demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/VisionLayout.kt

@@ -1,7 +1,8 @@
-package space.kscience.visionforge
+package space.kscience.visionforge.solid.demo
 
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.names.Name
+import space.kscience.visionforge.Vision
 
 public interface VisionLayout<in V: Vision> {
     public fun render(name: Name, vision: V, meta: Meta = Meta.EMPTY)

demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/demo.kt

@@ -6,9 +6,8 @@ import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.invoke
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.Name
 import space.kscience.visionforge.Colors
-import space.kscience.visionforge.VisionLayout
 import space.kscience.visionforge.solid.*
 import space.kscience.visionforge.solid.specifications.Canvas3DOptions
 import space.kscience.visionforge.visible
@@ -23,7 +22,7 @@ fun VisionLayout<Solid>.demo(name: String, title: String = name, block: SolidGro
         "title" put title
     }
     val vision = SolidGroup(block)
-    render(name.toName(), vision)
+    render(Name.parse(name), vision)
 }
 
 val canvasOptions = Canvas3DOptions {

demo/solid-showcase/src/jsMain/kotlin/space/kscience/visionforge/solid/demo/ThreeDemoGrid.kt

@@ -15,7 +15,6 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.names.Name
-import space.kscience.visionforge.VisionLayout
 import space.kscience.visionforge.solid.Solid
 import space.kscience.visionforge.solid.three.ThreeCanvas
 import space.kscience.visionforge.solid.three.ThreePlugin

demo/solid-showcase/src/jvmMain/kotlin/space/kscience/visionforge/solid/demo/FXDemoGrid.kt

@@ -7,7 +7,6 @@ import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.context.fetch
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.names.Name
-import space.kscience.visionforge.VisionLayout
 import space.kscience.visionforge.solid.FX3DPlugin
 import space.kscience.visionforge.solid.FXCanvas3D
 import space.kscience.visionforge.solid.Solid

demo/solid-showcase/src/jvmMain/kotlin/space/kscience/visionforge/solid/demo/MetaEditorDemo.kt

@@ -2,12 +2,14 @@ package space.kscience.visionforge.demo
 
 import javafx.geometry.Orientation
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.asConfig
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.MutableMeta
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.node
+import space.kscience.dataforge.meta.descriptors.value
 import space.kscience.dataforge.values.ValueType
-import space.kscience.visionforge.editor.ConfigEditor
-import space.kscience.visionforge.editor.FXMeta
+import space.kscience.visionforge.editor.FXMetaModel
 import space.kscience.visionforge.editor.MetaViewer
+import space.kscience.visionforge.editor.MutableMetaEditor
 import tornadofx.*
 
 
@@ -15,7 +17,7 @@ class MetaEditorDemoApp : App(MetaEditorDemo::class)
 
 class MetaEditorDemo : View("Meta editor demo") {
 
-    val meta = Meta {
+    val meta = MutableMeta {
         "aNode" put {
             "innerNode" put {
                 "innerValue" put true
@@ -23,18 +25,16 @@ class MetaEditorDemo : View("Meta editor demo") {
             "b" put 223
             "c" put "StringValue"
         }
-    }.asConfig()
+    }
 
-    val descriptor = NodeDescriptor {
+    val descriptor = MetaDescriptor {
         node("aNode") {
             info = "A root demo node"
-            value("b") {
+            value("b", ValueType.NUMBER) {
                 info = "b number value"
-                type(ValueType.NUMBER)
             }
             node("otherNode") {
-                value("otherValue") {
-                    type(ValueType.BOOLEAN)
+                value("otherValue", ValueType.BOOLEAN) {
                     default(false)
                     info = "default value"
                 }
@@ -46,12 +46,13 @@ class MetaEditorDemo : View("Meta editor demo") {
         }
     }
 
-    private val rootNode = FXMeta.root(meta, descriptor)
+    private val rootNode = FXMetaModel.root(meta, descriptor)
 
-    override val root =
-        splitpane(Orientation.HORIZONTAL, MetaViewer(rootNode).root, ConfigEditor(
-            rootNode
-        ).root)
+    override val root = splitpane(
+        Orientation.HORIZONTAL,
+        MetaViewer(rootNode as Meta).root,
+        MutableMetaEditor(rootNode as FXMetaModel<MutableMeta>).root
+    )
 }
 
 fun main() {

docs/design.md

@@ -1,5 +1,5 @@
 ## Library design
-The central point of the library design is the `Vision` interface. The `Vision` stores an optional reference to its parent and is able to store a number of mutable or read-only properties. Each property is represented by its `Name`, and a `MetaItem` value-tree, both following DataForge library specification (discussed in the [Appendix](appendix.md)). The `Vision` objects are organized in a tree using `VisionGroup` as nodes. `VisionGroup` additionally to all `Vision` properties holds a `children` container that holds named references to its direct children `Vision`s. Thus, `Vision`s form a doubly linked tree (a parent stores references to all its children and children store a reference to the parent).
+The central point of the library design is the `Vision` interface. The `Vision` stores an optional reference to its parent and is able to store a number of mutable or read-only properties. Each property is represented by its `Name`, and a `Meta` value-tree, both following DataForge library specification (discussed in the [Appendix](appendix.md)). The `Vision` objects are organized in a tree using `VisionGroup` as nodes. `VisionGroup` additionally to all `Vision` properties holds a `children` container that holds named references to its direct children `Vision`s. Thus, `Vision`s form a doubly linked tree (a parent stores references to all its children and children store a reference to the parent).
 
 An important concept using in the VisionForge is the property layering mechanism. It means that if the property with a given name is not found in the `Vision` it is requested from, it could be requested from the parent `Vision`, form the style declaration, the prototype for the vision or any other place defined by the component author. For example, let's take a `color` attribute used in 3D visualization. When one draws a group of objects, he usually wants to make the color of all objects in the group to be defined by a single handle in the group common ancestor. So when the parent color changes, all children color must follow suite, but we also want to change children color individually without changing the parent. In this case two property layers are defined:
 

docs/uml/Vision.puml

@@ -3,7 +3,7 @@
 
 interface Vision{
     val parent: Vision?
-    fun getProperty(name): MetaItem?
+    fun getProperty(name): Meta?
     fun setProperty(name, value)
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

settings.gradle.kts

@@ -1,6 +1,6 @@
 pluginManagement {
 
-    val toolsVersion = "0.10.0"
+    val toolsVersion = "0.10.2"
 
     repositories {
         maven("https://repo.kotlin.link")

ui/bootstrap/build.gradle.kts

@@ -11,5 +11,5 @@ dependencies {
     implementation(npm("file-saver", "2.0.2"))
     implementation(npm("bootstrap","4.6.0"))
     implementation(npm("jquery","3.5.1"))
-    implementation(npm("popper.js","1.16.1"))
+    implementation(npm("@popperjs/core","2.9.3"))
 }

ui/bootstrap/src/main/kotlin/space/kscience/visionforge/bootstrap/outputConfig.kt

@@ -12,6 +12,7 @@ import org.w3c.files.BlobPropertyBag
 import react.*
 import react.dom.attrs
 import react.dom.button
+import space.kscience.dataforge.meta.descriptors.defaultNode
 import space.kscience.dataforge.meta.withDefault
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.react.flexColumn
@@ -43,7 +44,7 @@ public external interface CanvasControlsProps : RProps {
     public var vision: Vision?
 }
 
-public val CanvasControls: FunctionalComponent<CanvasControlsProps> = functionalComponent("CanvasControls") { props ->
+public val CanvasControls: FunctionComponent<CanvasControlsProps> = functionalComponent("CanvasControls") { props ->
     flexColumn {
         flexRow {
             css {
@@ -66,7 +67,7 @@ public val CanvasControls: FunctionalComponent<CanvasControlsProps> = functional
         }
         propertyEditor(
             ownProperties = props.canvasOptions,
-            allProperties = props.canvasOptions.withDefault(Canvas3DOptions.descriptor.defaultMeta),
+            allProperties = props.canvasOptions.meta.withDefault(Canvas3DOptions.descriptor.defaultNode),
             descriptor = Canvas3DOptions.descriptor,
             expanded = false
         )

ui/bootstrap/src/main/kotlin/space/kscience/visionforge/bootstrap/tabComponent.kt

@@ -18,7 +18,7 @@ public external class TabProps : RProps {
 }
 
 @JsExport
-public val Tab: FunctionalComponent<TabProps> = functionalComponent { props ->
+public val Tab: FunctionComponent<TabProps> = functionalComponent { props ->
     props.children()
 }
 
@@ -27,7 +27,7 @@ public external class TabPaneProps : RProps {
 }
 
 @JsExport
-public val TabPane: FunctionalComponent<TabPaneProps> = functionalComponent("TabPane") { props ->
+public val TabPane: FunctionComponent<TabPaneProps> = functionalComponent("TabPane") { props ->
     var activeTab: String? by useState(props.activeTab)
 
     val children: Array<out ReactElement?> = Children.map(props.children) {

ui/bootstrap/src/main/kotlin/space/kscience/visionforge/bootstrap/visionPropertyEditor.kt

@@ -3,22 +3,25 @@ package space.kscience.visionforge.bootstrap
 import org.w3c.dom.Element
 import react.RBuilder
 import react.dom.render
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.visionforge.*
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.visionforge.Vision
+import space.kscience.visionforge.getStyle
+import space.kscience.visionforge.meta
 import space.kscience.visionforge.react.metaViewer
 import space.kscience.visionforge.react.propertyEditor
 import space.kscience.visionforge.solid.SolidReference
+import space.kscience.visionforge.styles
 
 public fun RBuilder.visionPropertyEditor(
     vision: Vision,
-    descriptor: NodeDescriptor? = vision.descriptor,
+    descriptor: MetaDescriptor? = vision.descriptor,
     key: Any? = null,
 ) {
 
     card("Properties") {
         propertyEditor(
-            ownProperties = vision.ownProperties,
-            allProperties = vision.allProperties(),
+            ownProperties = vision.meta(false,false,false),
+            allProperties = vision.meta(),
             updateFlow = vision.propertyChanges,
             descriptor = descriptor,
             key = key
@@ -47,7 +50,7 @@ public fun RBuilder.visionPropertyEditor(
 
 public fun Element.visionPropertyEditor(
     item: Vision,
-    descriptor: NodeDescriptor? = item.descriptor,
+    descriptor: MetaDescriptor? = item.descriptor,
 ): Unit = render(this) {
     visionPropertyEditor(item, descriptor = descriptor)
 }

ui/react/src/main/kotlin/space/kscience/visionforge/react/MetaViewer.kt

@@ -8,12 +8,11 @@ import react.*
 import react.dom.a
 import react.dom.attrs
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MetaItemNode
-import space.kscience.dataforge.meta.MetaItemValue
-import space.kscience.dataforge.meta.descriptors.ItemDescriptor
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.defaultNode
 import space.kscience.dataforge.meta.descriptors.get
 import space.kscience.dataforge.meta.get
+import space.kscience.dataforge.meta.isLeaf
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.NameToken
 import space.kscience.dataforge.names.lastOrNull
@@ -41,18 +40,19 @@ public external interface MetaViewerProps : RProps {
     /**
      * Root descriptor
      */
-    public var descriptor: NodeDescriptor?
+    public var descriptor: MetaDescriptor?
 }
 
-private val MetaViewerItem: FunctionalComponent<MetaViewerProps> = functionalComponent("MetaViewerItem") { props ->
+private val MetaViewerItem: FunctionComponent<MetaViewerProps> = functionalComponent("MetaViewerItem") { props ->
     metaViewerItem(props)
 }
 
 private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
     var expanded: Boolean by useState { true }
     val item = props.root[props.name]
-    val descriptorItem: ItemDescriptor? = props.descriptor?.get(props.name)
-    val actualItem = item ?: descriptorItem?.defaultValue
+    val descriptorItem: MetaDescriptor? = props.descriptor?.get(props.name)
+    val actualValue = item?.value ?: descriptorItem?.defaultValue
+    val actualMeta = item ?: descriptorItem?.defaultNode
 
     val token = props.name.lastOrNull()?.toString() ?: props.rootName ?: ""
 
@@ -60,12 +60,11 @@ private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
         expanded = !expanded
     }
 
-    when (actualItem) {
-        is MetaItemNode -> {
     flexRow {
         css {
             alignItems = Align.center
         }
+        if (actualMeta?.isLeaf == false) {
             styledSpan {
                 css {
                     +TreeStyles.treeCaret
@@ -77,6 +76,8 @@ private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
                     onClickFunction = expanderClick
                 }
             }
+        }
+
         styledSpan {
             css {
                 +TreeStyles.treeLabel
@@ -86,6 +87,11 @@ private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
             }
             +token
         }
+        styledDiv {
+            a {
+                +actualValue.toString()
+            }
+        }
     }
     if (expanded) {
         flexColumn {
@@ -93,10 +99,10 @@ private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
                 +TreeStyles.tree
             }
             val keys = buildSet {
-                        (descriptorItem as? NodeDescriptor)?.items?.keys?.forEach {
+                descriptorItem?.children?.keys?.forEach {
                     add(NameToken(it))
                 }
-                        actualItem.node.items.keys.let { addAll(it) }
+                actualMeta!!.items.keys.let { addAll(it) }
             }
 
             keys.filter { !it.body.startsWith("@") }.forEach { token ->
@@ -117,33 +123,12 @@ private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
             }
         }
     }
-        }
-        is MetaItemValue -> {
-            flexRow {
-                css {
-                    alignItems = Align.center
-                }
-                styledSpan {
-                    css {
-                        +TreeStyles.treeLabel
-                        if (item == null) {
-                            +TreeStyles.treeLabelInactive
-                        }
-                    }
-                    +token
-                }
-                styledDiv {
-                    a {
-                        +actualItem.value.toString()
-                    }
-                }
-            }
-        }
-    }
+
+
 }
 
 @JsExport
-public val MetaViewer: FunctionalComponent<MetaViewerProps> =
+public val MetaViewer: FunctionComponent<MetaViewerProps> =
     functionalComponent<MetaViewerProps>("MetaViewer") { props ->
         child(MetaViewerItem) {
             attrs {
@@ -155,7 +140,7 @@ public val MetaViewer: FunctionalComponent<MetaViewerProps> =
         }
     }
 
-public fun RBuilder.metaViewer(meta: Meta, descriptor: NodeDescriptor? = null, key: Any? = null) {
+public fun RBuilder.metaViewer(meta: Meta, descriptor: MetaDescriptor? = null, key: Any? = null) {
     child(MetaViewer) {
         attrs {
             this.key = key?.toString() ?: ""

ui/react/src/main/kotlin/space/kscience/visionforge/react/MultiSelectChooser.kt

@@ -5,20 +5,20 @@ import org.w3c.dom.HTMLOptionElement
 import org.w3c.dom.HTMLSelectElement
 import org.w3c.dom.asList
 import org.w3c.dom.events.Event
-import react.FunctionalComponent
+import react.FunctionComponent
 import react.dom.attrs
 import react.dom.option
 import react.dom.select
 import react.functionalComponent
 import react.useState
-import space.kscience.dataforge.meta.value
+import space.kscience.dataforge.meta.descriptors.allowedValues
 import space.kscience.dataforge.values.asValue
 import space.kscience.dataforge.values.string
 
 @JsExport
-public val MultiSelectChooser: FunctionalComponent<ValueChooserProps> =
+public val MultiSelectChooser: FunctionComponent<ValueChooserProps> =
     functionalComponent("MultiSelectChooser") { props ->
-        var selectedItems by useState { props.item.value?.list ?: emptyList() }
+        var selectedItems by useState { props.item?.value?.list ?: emptyList() }
 
         val onChange: (Event) -> Unit = { event: Event ->
             val newSelected = (event.target as HTMLSelectElement).selectedOptions.asList()

ui/react/src/main/kotlin/space/kscience/visionforge/react/PropertyEditor.kt

@@ -18,14 +18,10 @@ import react.*
 import react.dom.attrs
 import react.dom.render
 import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.ItemDescriptor
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.descriptors.ValueDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.ValueRequirement
 import space.kscience.dataforge.meta.descriptors.get
-import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.NameToken
-import space.kscience.dataforge.names.lastOrNull
-import space.kscience.dataforge.names.plus
+import space.kscience.dataforge.names.*
 import space.kscience.dataforge.values.Value
 import space.kscience.visionforge.hidden
 import styled.css
@@ -38,12 +34,12 @@ public external interface PropertyEditorProps : RProps {
     /**
      * Root config object - always non null
      */
-    public var ownProperties: MutableItemProvider
+    public var ownProperties: MutableMetaProvider
 
     /**
      * Provide default item (greyed out if used)
      */
-    public var allProperties: ItemProvider?
+    public var allProperties: MetaProvider?
 
     /**
      * Full path to the displayed node in [ownProperties]. Could be empty
@@ -53,7 +49,7 @@ public external interface PropertyEditorProps : RProps {
     /**
      * Root descriptor
      */
-    public var descriptor: NodeDescriptor?
+    public var descriptor: MetaDescriptor?
 
     /**
      * A coroutine scope for updates
@@ -71,21 +67,21 @@ public external interface PropertyEditorProps : RProps {
     public var expanded: Boolean?
 }
 
-private val PropertyEditorItem: FunctionalComponent<PropertyEditorProps> =
+private val PropertyEditorItem: FunctionComponent<PropertyEditorProps> =
     functionalComponent("ConfigEditorItem") { props ->
         propertyEditorItem(props)
     }
 
 private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
     var expanded: Boolean by useState { props.expanded ?: true }
-    val descriptorItem: ItemDescriptor? = props.descriptor?.get(props.name)
-    var ownProperty: MetaItem? by useState { props.ownProperties.getItem(props.name) }
-    val actualItem: MetaItem? = props.allProperties?.getItem(props.name)
+    val descriptor: MetaDescriptor? = props.descriptor?.get(props.name)
+    var ownProperty: Meta? by useState { props.ownProperties.getMeta(props.name) }
+    val actualMeta = props.allProperties?.getMeta(props.name)
 
     val token = props.name.lastOrNull()?.toString() ?: "Properties"
 
     fun update() {
-        ownProperty = props.ownProperties.getItem(props.name)
+        ownProperty = props.ownProperties.getMeta(props.name)
     }
 
     if (props.updateFlow != null) {
@@ -109,7 +105,7 @@ private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
         if (it == null) {
             props.ownProperties.remove(props.name)
         } else {
-            props.ownProperties[props.name] = it
+            props.ownProperties.setValue(props.name, it)
         }
         update()
     }
@@ -119,19 +115,20 @@ private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
         update()
     }
 
-    if (actualItem is MetaItemNode) {
     val keys = buildSet {
-            (descriptorItem as? NodeDescriptor)?.items?.filterNot {
+        descriptor?.children?.filterNot {
             it.key.startsWith("@") || it.value.hidden
         }?.forEach {
             add(NameToken(it.key))
         }
-            ownProperty?.node?.items?.keys?.filterNot { it.body.startsWith("@") }?.let { addAll(it) }
+        ownProperty?.items?.keys?.filterNot { it.body.startsWith("@") }?.let { addAll(it) }
     }
-        // Do not show nodes without visible children
-        if (keys.isEmpty()) return
 
     flexRow {
+        css {
+            alignItems = Align.center
+        }
+        if(keys.isNotEmpty()) {
             styledSpan {
                 css {
                     +TreeStyles.treeCaret
@@ -143,44 +140,6 @@ private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
                     onClickFunction = expanderClick
                 }
             }
-            styledSpan {
-                css {
-                    +TreeStyles.treeLabel
-                    if (ownProperty == null) {
-                        +TreeStyles.treeLabelInactive
-                    }
-                }
-                +token
-            }
-        }
-        if (expanded) {
-            flexColumn {
-                css {
-                    +TreeStyles.tree
-                }
-                keys.forEach { token ->
-                    styledDiv {
-                        css {
-                            +TreeStyles.treeItem
-                        }
-                        child(PropertyEditorItem) {
-                            attrs {
-                                this.key = props.name.toString()
-                                this.ownProperties = props.ownProperties
-                                this.allProperties = props.allProperties
-                                this.name = props.name + token
-                                this.descriptor = props.descriptor
-                            }
-                        }
-                        //configEditor(props.root, props.name + token, props.descriptor, props.default)
-                    }
-                }
-            }
-        }
-    } else {
-        flexRow {
-            css {
-                alignItems = Align.center
         }
         styledSpan {
             css {
@@ -191,7 +150,7 @@ private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
             }
             +token
         }
-
+        if(!props.name.isEmpty() && descriptor?.valueRequirement != ValueRequirement.ABSENT) {
             styledDiv {
                 css {
                     //+TreeStyles.resizeableInput
@@ -200,8 +159,8 @@ private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
                 }
                 valueChooser(
                     props.name,
-                    actualItem,
-                    descriptorItem as? ValueDescriptor,
+                    actualMeta,
+                    descriptor,
                     valueChanged
                 )
             }
@@ -232,14 +191,38 @@ private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
                     }
                 }
             }
+        }
+    }
+    if (expanded) {
+        flexColumn {
+            css {
+                +TreeStyles.tree
+            }
+            keys.forEach { token ->
+                styledDiv {
+                    css {
+                        +TreeStyles.treeItem
+                    }
+                    child(PropertyEditorItem) {
+                        attrs {
+                            this.key = props.name.toString()
+                            this.ownProperties = props.ownProperties
+                            this.allProperties = props.allProperties
+                            this.name = props.name + token
+                            this.descriptor = props.descriptor
+                        }
+                    }
+                    //configEditor(props.root, props.name + token, props.descriptor, props.default)
+                }
+            }
+        }
+    }
 
 }
-    }
-}
 
 
 @JsExport
-public val PropertyEditor: FunctionalComponent<PropertyEditorProps> = functionalComponent("PropertyEditor") { props ->
+public val PropertyEditor: FunctionComponent<PropertyEditorProps> = functionalComponent("PropertyEditor") { props ->
     child(PropertyEditorItem) {
         attrs {
             this.key = ""
@@ -254,10 +237,10 @@ public val PropertyEditor: FunctionalComponent<PropertyEditorProps> = functional
 }
 
 public fun RBuilder.propertyEditor(
-    ownProperties: MutableItemProvider,
-    allProperties: ItemProvider? = ownProperties,
+    ownProperties: MutableMetaProvider,
+    allProperties: MetaProvider? = ownProperties,
     updateFlow: Flow<Name>? = null,
-    descriptor: NodeDescriptor? = null,
+    descriptor: MetaDescriptor? = null,
     scope: CoroutineScope? = null,
     key: Any? = null,
     expanded: Boolean? = null
@@ -276,8 +259,8 @@ public fun RBuilder.propertyEditor(
 }
 
 @OptIn(ExperimentalCoroutinesApi::class)
-private fun Config.flowUpdates(): Flow<Name> = callbackFlow {
-    onChange(this) { name, _, _ ->
+private fun ObservableMutableMeta.flowUpdates(): Flow<Name> = callbackFlow {
+    onChange(this) { name ->
         launch {
             send(name)
         }
@@ -289,16 +272,16 @@ private fun Config.flowUpdates(): Flow<Name> = callbackFlow {
 
 
 public fun RBuilder.configEditor(
-    config: Config,
-    default: ItemProvider? = null,
-    descriptor: NodeDescriptor? = null,
+    config: ObservableMutableMeta,
+    default: MetaProvider? = null,
+    descriptor: MetaDescriptor? = null,
     key: Any? = null,
     scope: CoroutineScope? = null,
 ): Unit = propertyEditor(config, default, config.flowUpdates(), descriptor, scope, key = key)
 
 public fun Element.configEditor(
-    config: Config,
-    descriptor: NodeDescriptor? = null,
+    config: ObservableMutableMeta,
+    descriptor: MetaDescriptor? = null,
     default: Meta? = null,
     key: Any? = null,
     scope: CoroutineScope? = null,

ui/react/src/main/kotlin/space/kscience/visionforge/react/RangeValueChooser.kt

@@ -6,7 +6,7 @@ import kotlinx.html.InputType
 import kotlinx.html.js.onChangeFunction
 import org.w3c.dom.HTMLInputElement
 import org.w3c.dom.events.Event
-import react.FunctionalComponent
+import react.FunctionComponent
 import react.dom.attrs
 import react.functionalComponent
 import react.useState
@@ -18,7 +18,7 @@ import styled.css
 import styled.styledInput
 
 @JsExport
-public val RangeValueChooser: FunctionalComponent<ValueChooserProps> =
+public val RangeValueChooser: FunctionComponent<ValueChooserProps> =
     functionalComponent("RangeValueChooser") { props ->
         var innerValue by useState(props.item.double)
         var rangeDisabled: Boolean by useState(props.item == null)

ui/react/src/main/kotlin/space/kscience/visionforge/react/ThreeCanvasComponent.kt

@@ -21,7 +21,7 @@ public external interface ThreeCanvasProps : RProps {
     public var selected: Name?
 }
 
-public val ThreeCanvasComponent: FunctionalComponent<ThreeCanvasProps> = functionalComponent(
+public val ThreeCanvasComponent: FunctionComponent<ThreeCanvasProps> = functionalComponent(
     "ThreeCanvasComponent"
 ) { props ->
     val elementRef = useRef<Element>(null)

ui/react/src/main/kotlin/space/kscience/visionforge/react/VisionTree.kt

@@ -107,7 +107,7 @@ private fun RBuilder.visionTree(props: ObjectTreeProps): Unit {
 }
 
 @JsExport
-public val ObjectTree: FunctionalComponent<ObjectTreeProps> = functionalComponent("ObjectTree") { props ->
+public val ObjectTree: FunctionComponent<ObjectTreeProps> = functionalComponent("ObjectTree") { props ->
     visionTree(props)
 }
 

ui/react/src/main/kotlin/space/kscience/visionforge/react/valueChooser.kt

@@ -13,8 +13,12 @@ import org.w3c.dom.events.Event
 import react.*
 import react.dom.attrs
 import react.dom.option
-import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.ValueDescriptor
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.boolean
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.allowedValues
+import space.kscience.dataforge.meta.get
+import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.values.*
 import space.kscience.visionforge.Colors
@@ -24,14 +28,15 @@ import styled.styledInput
 import styled.styledSelect
 
 public external interface ValueChooserProps : RProps {
-    public var item: MetaItem?
-    public var descriptor: ValueDescriptor?
+    public var item: Meta?
+    public var descriptor: MetaDescriptor?
+
     //public var nullable: Boolean?
     public var valueChanged: ((Value?) -> Unit)?
 }
 
 @JsExport
-public val StringValueChooser: FunctionalComponent<ValueChooserProps> =
+public val StringValueChooser: FunctionComponent<ValueChooserProps> =
     functionalComponent("StringValueChooser") { props ->
         var value by useState(props.item.string ?: "")
         val keyDown: (Event) -> Unit = { event ->
@@ -58,7 +63,7 @@ public val StringValueChooser: FunctionalComponent<ValueChooserProps> =
     }
 
 @JsExport
-public val BooleanValueChooser: FunctionalComponent<ValueChooserProps> =
+public val BooleanValueChooser: FunctionComponent<ValueChooserProps> =
     functionalComponent("BooleanValueChooser") { props ->
         val handleChange: (Event) -> Unit = {
             val newValue = (it.target as HTMLInputElement).checked
@@ -77,7 +82,7 @@ public val BooleanValueChooser: FunctionalComponent<ValueChooserProps> =
     }
 
 @JsExport
-public val NumberValueChooser: FunctionalComponent<ValueChooserProps> =
+public val NumberValueChooser: FunctionComponent<ValueChooserProps> =
     functionalComponent("NumberValueChooser") { props ->
         var innerValue by useState(props.item.string ?: "")
         val keyDown: (Event) -> Unit = { event ->
@@ -116,7 +121,7 @@ public val NumberValueChooser: FunctionalComponent<ValueChooserProps> =
     }
 
 @JsExport
-public val ComboValueChooser: FunctionalComponent<ValueChooserProps> =
+public val ComboValueChooser: FunctionComponent<ValueChooserProps> =
     functionalComponent("ComboValueChooser") { props ->
         var selected by useState(props.item.string ?: "")
         val handleChange: (Event) -> Unit = {
@@ -141,10 +146,10 @@ public val ComboValueChooser: FunctionalComponent<ValueChooserProps> =
     }
 
 @JsExport
-public val ColorValueChooser: FunctionalComponent<ValueChooserProps> =
+public val ColorValueChooser: FunctionComponent<ValueChooserProps> =
     functionalComponent("ColorValueChooser") { props ->
         var value by useState(
-            props.item.value?.let { value ->
+            props.item?.value?.let { value ->
                 if (value.type == ValueType.NUMBER) Colors.rgbToString(value.int)
                 else value.string
             } ?: "#000000"
@@ -166,11 +171,11 @@ public val ColorValueChooser: FunctionalComponent<ValueChooserProps> =
     }
 
 @JsExport
-public val ValueChooser: FunctionalComponent<ValueChooserProps> = functionalComponent("ValueChooser") { props ->
+public val ValueChooser: FunctionComponent<ValueChooserProps> = functionalComponent("ValueChooser") { props ->
     val rawInput by useState(false)
 
     val descriptor = props.descriptor
-    val type = descriptor?.type?.firstOrNull()
+    val type = descriptor?.valueTypes?.firstOrNull()
 
     when {
         rawInput -> child(StringValueChooser, props)
@@ -187,8 +192,8 @@ public val ValueChooser: FunctionalComponent<ValueChooserProps> = functionalComp
 
 internal fun RBuilder.valueChooser(
     name: Name,
-    item: MetaItem?,
-    descriptor: ValueDescriptor? = null,
+    item: Meta?,
+    descriptor: MetaDescriptor? = null,
     callback: (Value?) -> Unit,
 ) {
     child(ValueChooser) {

ui/ring/build.gradle.kts

@@ -17,14 +17,13 @@ kotlin{
 
 dependencies{
     api(project(":ui:react"))
-    //TODO replace by kotlin-wrappers
-    api("ru.mipt.npm:ring-ui:0.1.0")
+    //api("ru.mipt.npm:ring-ui:0.1.0")
+    api("org.jetbrains.kotlin-wrappers:kotlin-ring-ui")
 
     implementation(npm("@jetbrains/icons", "3.14.1"))
     implementation(npm("@jetbrains/ring-ui", "4.0.7"))
     implementation(npm("core-js","3.12.1"))
     implementation(npm("file-saver", "2.0.2"))
-    compileOnly(npm("url-loader","4.1.1"))
-    compileOnly(npm("postcss-loader","5.2.0"))
-    compileOnly(npm("source-map-loader","2.0.1"))
+//    compileOnly(npm("url-loader","4.1.1"))
+//    compileOnly(npm("postcss-loader","5.2.0"))
 }

ui/ring/src/main/kotlin/space.kscience.visionforge.ring/ThreeViewWithControls.kt

@@ -14,8 +14,7 @@ import space.kscience.dataforge.names.NameToken
 import space.kscience.dataforge.names.isEmpty
 import space.kscience.dataforge.names.length
 import space.kscience.visionforge.VisionGroup
-import space.kscience.visionforge.allProperties
-import space.kscience.visionforge.ownProperties
+import space.kscience.visionforge.meta
 import space.kscience.visionforge.react.ThreeCanvasComponent
 import space.kscience.visionforge.react.flexColumn
 import space.kscience.visionforge.react.flexRow
@@ -70,7 +69,7 @@ public fun RBuilder.nameCrumbs(name: Name?, link: (Name) -> Unit): ReactElement
 }
 
 @JsExport
-public val ThreeCanvasWithControls: FunctionalComponent<ThreeCanvasWithControlsProps> =
+public val ThreeCanvasWithControls: FunctionComponent<ThreeCanvasWithControlsProps> =
     functionalComponent("ThreeViewWithControls") { props ->
         var selected by useState { props.selected }
 
@@ -135,8 +134,8 @@ public val ThreeCanvasWithControls: FunctionalComponent<ThreeCanvasWithControlsP
                             }
                             IslandContent {
                                 propertyEditor(
-                                    ownProperties = vision.ownProperties,
-                                    allProperties = vision.allProperties(),
+                                    ownProperties = vision.meta(false, false, false),
+                                    allProperties = vision.meta(),
                                     updateFlow = vision.propertyChanges,
                                     descriptor = vision.descriptor,
                                     key = selected

ui/ring/src/main/kotlin/space.kscience.visionforge.ring/ringPropertyEditor.kt

@@ -7,16 +7,19 @@ import react.dom.render
 import ringui.Island
 import ringui.SmartTabs
 import ringui.Tab
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.visionforge.*
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.visionforge.Vision
+import space.kscience.visionforge.getStyle
+import space.kscience.visionforge.meta
 import space.kscience.visionforge.react.flexColumn
 import space.kscience.visionforge.react.metaViewer
 import space.kscience.visionforge.react.propertyEditor
 import space.kscience.visionforge.solid.SolidReference
+import space.kscience.visionforge.styles
 
 public fun RBuilder.ringPropertyEditor(
     vision: Vision,
-    descriptor: NodeDescriptor? = vision.descriptor,
+    descriptor: MetaDescriptor? = vision.descriptor,
     key: Any? = null,
 ) {
     val styles = if (vision is SolidReference) {
@@ -28,8 +31,8 @@ public fun RBuilder.ringPropertyEditor(
     flexColumn {
         Island("Properties") {
             propertyEditor(
-                ownProperties = vision.ownProperties,
-                allProperties = vision.allProperties(),
+                ownProperties = vision.meta(false,false,false),
+                allProperties = vision.meta(),
                 updateFlow = vision.propertyChanges,
                 descriptor = descriptor,
                 key = key
@@ -69,7 +72,7 @@ public fun RBuilder.ringPropertyEditor(
 
 public fun Element.ringPropertyEditor(
     item: Vision,
-    descriptor: NodeDescriptor? = item.descriptor,
+    descriptor: MetaDescriptor? = item.descriptor,
 ): Unit = render(this) {
     ringPropertyEditor(item, descriptor = descriptor)
 }

ui/ring/src/main/kotlin/space.kscience.visionforge.ring/ringThreeControls.kt

@@ -15,6 +15,7 @@ import react.dom.button
 import ringui.Island
 import ringui.SmartTabs
 import ringui.Tab
+import space.kscience.dataforge.meta.descriptors.defaultNode
 import space.kscience.dataforge.meta.withDefault
 import space.kscience.dataforge.names.Name
 import space.kscience.visionforge.Vision
@@ -49,7 +50,7 @@ internal external interface CanvasControlsProps : RProps {
     public var vision: Vision?
 }
 
-internal val CanvasControls: FunctionalComponent<CanvasControlsProps> = functionalComponent("CanvasControls") { props ->
+internal val CanvasControls: FunctionComponent<CanvasControlsProps> = functionalComponent("CanvasControls") { props ->
     flexColumn {
         flexRow {
             css {
@@ -73,7 +74,7 @@ internal val CanvasControls: FunctionalComponent<CanvasControlsProps> = function
         }
         propertyEditor(
             ownProperties = props.options,
-            allProperties = props.options.withDefault(Canvas3DOptions.descriptor.defaultMeta),
+            allProperties = props.options.meta.withDefault(Canvas3DOptions.descriptor.defaultNode),
             descriptor = Canvas3DOptions.descriptor,
             expanded = false
         )
@@ -91,7 +92,7 @@ public external interface ThreeControlsProps : RProps {
 }
 
 @JsExport
-public val ThreeControls: FunctionalComponent<ThreeControlsProps> = functionalComponent { props ->
+public val ThreeControls: FunctionComponent<ThreeControlsProps> = functionalComponent { props ->
     SmartTabs("Tree") {
         props.vision?.let {
             Tab("Tree") {

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Colors.kt

@@ -1,6 +1,8 @@
 package space.kscience.visionforge
 
-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.get
+import space.kscience.dataforge.meta.number
 import space.kscience.dataforge.values.ValueType
 import space.kscience.dataforge.values.int
 import space.kscience.dataforge.values.string
@@ -190,25 +192,18 @@ public object Colors {
     /**
      * Convert color represented as Meta to string of format #rrggbb
      */
-    fun fromMeta(item: MetaItem): String {
-        return when (item) {
-            is MetaItemNode -> {
-                val node = item.node
-                rgbToString(
-                    node[RED_KEY].number?.toByte()?.toUByte() ?: 0u,
-                    node[GREEN_KEY].number?.toByte()?.toUByte() ?: 0u,
-                    node[BLUE_KEY].number?.toByte()?.toUByte() ?: 0u
-                )
-            }
-            is MetaItemValue -> {
-                if (item.value.type == ValueType.NUMBER) {
-                    rgbToString(item.value.int)
+    fun fromMeta(meta: Meta): String = meta.value?.let { value ->
+        //if value is present, use it
+        if (value.type == ValueType.NUMBER) {
+            rgbToString(value.int)
         } else {
-                    item.value.string
-                }
-            }
-        }
+            value.string
         }
+    } ?: rgbToString(
+        meta[RED_KEY].number?.toByte()?.toUByte() ?: 0u,
+        meta[GREEN_KEY].number?.toByte()?.toUByte() ?: 0u,
+        meta[BLUE_KEY].number?.toByte()?.toUByte() ?: 0u
+    )
 
     /**
      * Convert Int color to string of format #rrggbb

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/StyleReference.kt

@@ -1,7 +1,7 @@
 package space.kscience.visionforge
 
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MetaBuilder
+import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.meta.Scheme
 import space.kscience.dataforge.meta.Specification
 import kotlin.properties.ReadOnlyProperty
@@ -27,7 +27,7 @@ public fun Vision.useStyle(reference: StyleReference) {
 @VisionBuilder
 public fun VisionGroup.style(
     styleKey: String? = null,
-    builder: MetaBuilder.() -> Unit,
+    builder: MutableMeta.() -> Unit,
 ): ReadOnlyProperty<Any?, StyleReference> = ReadOnlyProperty { _, property ->
     val styleName = styleKey ?: property.name
     styleSheet.define(styleName, Meta(builder))

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/StyleSheet.kt

@@ -5,6 +5,7 @@ import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.NameToken
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
+import space.kscience.dataforge.values.asValue
 import kotlin.jvm.JvmInline
 
 /**
@@ -13,9 +14,9 @@ import kotlin.jvm.JvmInline
 @JvmInline
 public value class StyleSheet(private val owner: VisionGroup) {
 
-    private val styleNode get() = owner.ownProperties[STYLESHEET_KEY].node
+    private val styleNode: Meta? get() = owner.getOwnProperty(STYLESHEET_KEY)
 
-    public val items: Map<NameToken, Meta>? get() = styleNode?.items?.mapValues { it.value.node ?: Meta.EMPTY }
+    public val items: Map<NameToken, Meta>? get() = styleNode?.items
 
     public operator fun get(key: String): Meta? = owner.getStyle(key)
 
@@ -23,7 +24,7 @@ public value class StyleSheet(private val owner: VisionGroup) {
      * Define a style without notifying owner
      */
     public fun define(key: String, style: Meta?) {
-        owner.setProperty(STYLESHEET_KEY + key, style)
+        owner.setPropertyNode(STYLESHEET_KEY + key, style)
     }
 
     /**
@@ -40,7 +41,7 @@ public value class StyleSheet(private val owner: VisionGroup) {
     /**
      * Create and set a style
      */
-    public operator fun set(key: String, builder: MetaBuilder.() -> Unit) {
+    public operator fun set(key: String, builder: MutableMeta.() -> Unit) {
         val newStyle = get(key)?.toMutableMeta()?.apply(builder) ?: Meta(builder)
         set(key, newStyle.seal())
     }
@@ -70,9 +71,9 @@ internal fun Vision.styleChanged(key: String, oldStyle: Meta?, newStyle: Meta?)
  * List of names of styles applied to this object. Order matters. Not inherited.
  */
 public var Vision.styles: List<String>
-    get() = ownProperties[Vision.STYLE_KEY]?.stringList ?: emptyList()
+    get() = getOwnProperty(Vision.STYLE_KEY)?.stringList ?: emptyList()
     set(value) {
-        setProperty(Vision.STYLE_KEY, value)
+        setPropertyValue(Vision.STYLE_KEY, value.map { it.asValue() }.asValue())
     }
 
 /**
@@ -85,7 +86,7 @@ public val VisionGroup.styleSheet: StyleSheet get() = StyleSheet(this)
  * Add style name to the list of styles to be resolved later. The style with given name does not necessary exist at the moment.
  */
 public fun Vision.useStyle(name: String) {
-    styles = (ownProperties[Vision.STYLE_KEY]?.stringList ?: emptyList()) + name
+    styles = (getOwnProperty(Vision.STYLE_KEY)?.stringList ?: emptyList()) + name
 }
 
 
@@ -93,13 +94,13 @@ public fun Vision.useStyle(name: String) {
  * Find a style with given name for given [Vision]. The style is not necessary applied to this [Vision].
  */
 public tailrec fun Vision.getStyle(name: String): Meta? =
-    ownProperties[StyleSheet.STYLESHEET_KEY + name].node ?: parent?.getStyle(name)
+    getOwnProperty(StyleSheet.STYLESHEET_KEY + name) ?: parent?.getStyle(name)
 
 /**
  * Resolve an item in all style layers
  */
-public fun Vision.getStyleItems(name: Name): List<MetaItem> = styles.mapNotNull {
-    getStyle(it)[name]
+public fun Vision.getStyleItems(name: Name): List<Meta> = styles.mapNotNull {
+    getStyle(it)?.get(name)
 }
 
 

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt

@@ -4,14 +4,15 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.meta.descriptors.Described
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.descriptors.get
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.update
 import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.values.Value
 import space.kscience.visionforge.Vision.Companion.TYPE
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
@@ -45,13 +46,13 @@ public interface Vision : Described, CoroutineScope {
         inherit: Boolean = false,
         includeStyles: Boolean = true,
         includeDefaults: Boolean = true,
-    ): MetaItem?
+    ): Meta?
 
     /**
      * Get an intrinsic property of this Vision excluding any inheritance or defaults. In most cases should be the same as
      * `getProperty(name, false, false, false`.
      */
-    public fun getOwnProperty(name: Name): MetaItem? = getProperty(
+    public fun getOwnProperty(name: Name): Meta? = getProperty(
         name,
         inherit = false,
         includeStyles = false,
@@ -59,9 +60,14 @@ public interface Vision : Described, CoroutineScope {
     )
 
     /**
-     * Set the property value
+     * Replace the property node. If [node] is null remove node and its descendants
      */
-    public fun setProperty(name: Name, item: MetaItem?, notify: Boolean = true)
+    public fun setPropertyNode(name: Name, node: Meta?, notify: Boolean = true)
+
+    /**
+     * Set a value of specific property node
+     */
+    public fun setPropertyValue(name: Name, value: Value?, notify: Boolean = true)
 
     /**
      * Flow of property invalidation events. It does not contain property values after invalidation since it is not clear
@@ -77,9 +83,9 @@ public interface Vision : Described, CoroutineScope {
     /**
      * Update this vision using a dif represented by [VisionChange].
      */
-    public fun update(change: VisionChange)
+    public fun change(change: VisionChange)
 
-    override val descriptor: NodeDescriptor?
+    override val descriptor: MetaDescriptor?
 
     public companion object {
         public const val TYPE: String = "vision"
@@ -89,11 +95,6 @@ public interface Vision : Described, CoroutineScope {
     }
 }
 
-/**
- * Root property node
- */
-public val Vision.meta: Meta get() = ownProperties[Name.EMPTY]?.node ?: Meta.EMPTY
-
 /**
  * Subscribe on property updates. The subscription is bound to the given [scope] and canceled when the scope is canceled
  */
@@ -105,31 +106,26 @@ public fun Vision.onPropertyChange(scope: CoroutineScope, callback: suspend (Nam
 /**
  * Own properties, excluding inheritance, styles and descriptor
  */
-public val Vision.ownProperties: MutableItemProvider
-    get() = object : MutableItemProvider {
-        override fun getItem(name: Name): MetaItem? = getOwnProperty(name)
-        override fun setItem(name: Name, item: MetaItem?): Unit = setProperty(name, item)
-    }
-
-/**
- * Convenient accessor for all properties of a vision.
- * @param inherit - inherit property value from the parent by default. If null, inheritance is inferred from descriptor
- */
-public fun Vision.allProperties(
-    inherit: Boolean? = null,
-    includeStyles: Boolean? = null,
+public fun Vision.meta(
+    inherit: Boolean = false,
+    includeStyles: Boolean = true,
     includeDefaults: Boolean = true,
-): MutableItemProvider = object : MutableItemProvider {
-    override fun getItem(name: Name): MetaItem? = getProperty(
-        name,
-        inherit = inherit ?: (descriptor?.get(name)?.inherited == true),
-        includeStyles = includeStyles ?: (descriptor?.get(name)?.usesStyles != false),
-        includeDefaults = includeDefaults
-    )
+): MutableMeta = VisionProperties(this, Name.EMPTY, inherit, includeStyles, includeDefaults)
 
-    override fun setItem(name: Name, item: MetaItem?): Unit = setProperty(name, item)
+public fun Vision.configure(target: Name = Name.EMPTY, block: MutableMeta.() -> Unit): Unit {
+    VisionProperties(this, target).apply(block)
 }
 
+public fun Vision.configure(meta: Meta) {
+    configure(Name.EMPTY) {
+        update(meta)
+    }
+}
+
+public fun Vision.configure(block: MutableMeta.() -> Unit): Unit = configure(Meta(block))
+
+public fun Vision.getOwnProperty(key: String): Meta? = getOwnProperty(Name.parse(key))
+
 /**
  * Get [Vision] property using key as a String
  */
@@ -138,18 +134,20 @@ public fun Vision.getProperty(
     inherit: Boolean = false,
     includeStyles: Boolean = true,
     includeDefaults: Boolean = true,
-): MetaItem? = getProperty(key.toName(), inherit, includeStyles, includeDefaults)
+): Meta? = getProperty(Name.parse(key), inherit, includeStyles, includeDefaults)
+
 
 /**
- * A convenience method to pair [getProperty]
+ * A convenience method to set property node or value. If Item is null, then node is removed, not a value
  */
-public fun Vision.setProperty(key: Name, item: Any?) {
-    setProperty(key, MetaItem.of(item))
+public fun Vision.setProperty(name: Name, item: Any?) {
+    when (item) {
+        null -> setPropertyNode(name, null)
+        is Meta -> setPropertyNode(name, item)
+        is Value -> setPropertyValue(name, item)
+    }
 }
 
-/**
- * A convenience method to pair [getProperty]
- */
-public fun Vision.setProperty(key: String, item: Any?) {
-    setProperty(key.toName(), MetaItem.of(item))
+public fun Vision.setPropertyNode(key: String, item: Any?) {
+    setProperty(Name.parse(key), item)
 }

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionBase.kt

@@ -7,21 +7,18 @@ import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.Transient
 import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.defaultNode
+import space.kscience.dataforge.meta.descriptors.value
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
-import space.kscience.dataforge.values.Null
+import space.kscience.dataforge.values.Value
 import space.kscience.dataforge.values.ValueType
 import space.kscience.visionforge.Vision.Companion.STYLE_KEY
 import kotlin.jvm.Synchronized
 
-internal data class PropertyListener(
-    val owner: Any? = null,
-    val action: (name: Name) -> Unit,
-)
-
 /**
  * A full base implementation for a [Vision]
  * @param properties Object own properties excluding styles and inheritance
@@ -29,14 +26,17 @@ internal data class PropertyListener(
 @Serializable
 @SerialName("vision")
 public open class VisionBase(
-    override @Transient var parent: VisionGroup? = null,
-    protected var properties: MutableItemProvider? = null
+    @Transient override var parent: VisionGroup? = null,
+    @Serializable(MutableMetaSerializer::class)
+    protected var properties: MutableMeta? = null
 ) : Vision {
 
+    //protected val observableProperties: ObservableMutableMeta by lazy { properties.asObservable() }
+
     @Synchronized
-    protected fun getOrCreateProperties(): MutableItemProvider {
+    protected fun getOrCreateProperties(): MutableMeta {
         if (properties == null) {
-            val newProperties = MetaBuilder()
+            val newProperties = MutableMeta()
             properties = newProperties
         }
         return properties!!
@@ -45,18 +45,14 @@ public open class VisionBase(
     /**
      * A fast accessor method to get own property (no inheritance or styles
      */
-    override fun getOwnProperty(name: Name): MetaItem? = if (name == Name.EMPTY) {
-        properties?.rootItem
-    } else {
-        properties?.getItem(name)
-    }
+    override fun getOwnProperty(name: Name): Meta? = properties?.getMeta(name)
 
     override fun getProperty(
         name: Name,
         inherit: Boolean,
         includeStyles: Boolean,
         includeDefaults: Boolean,
-    ): MetaItem? = if (!inherit && !includeStyles && !includeDefaults) {
+    ): Meta? = if (!inherit && !includeStyles && !includeDefaults) {
         getOwnProperty(name)
     } else {
         buildList {
@@ -68,22 +64,32 @@ public open class VisionBase(
                 add(parent?.getProperty(name, inherit, includeStyles, includeDefaults))
             }
             if (includeDefaults) {
-                add(descriptor?.defaultMeta?.get(name))
+                add(descriptor?.defaultNode?.get(name))
             }
         }.merge()
     }
 
-    override fun setProperty(name: Name, item: MetaItem?, notify: Boolean) {
-        val oldItem = properties?.getItem(name)
-        if(oldItem!= item) {
-            getOrCreateProperties().setItem(name, item)
+    override fun setPropertyNode(name: Name, node: Meta?, notify: Boolean) {
+        val oldItem = properties?.get(name)
+        if (oldItem != node) {
+            getOrCreateProperties().setMeta(name, node)
             if (notify) {
                 invalidateProperty(name)
             }
         }
     }
 
-    override val descriptor: NodeDescriptor? get() = null
+    override fun setPropertyValue(name: Name, value: Value?, notify: Boolean) {
+        val oldItem = properties?.get(name)?.value
+        if (oldItem != value) {
+            getOrCreateProperties()[name] = value
+            if (notify) {
+                invalidateProperty(name)
+            }
+        }
+    }
+
+    override val descriptor: MetaDescriptor? get() = null
 
     private suspend fun updateStyles(names: List<String>) {
         names.mapNotNull { getStyle(it) }.asSequence()
@@ -111,31 +117,23 @@ public open class VisionBase(
         }
     }
 
-    override fun update(change: VisionChange) {
+    override fun change(change: VisionChange) {
         change.properties?.let {
-            updateProperties(Name.EMPTY, it.asMetaItem())
+            updateProperties(Name.EMPTY, it)
         }
     }
 
     public companion object {
-        public val descriptor: NodeDescriptor = NodeDescriptor {
-            value(STYLE_KEY) {
-                type(ValueType.STRING)
+        public val descriptor: MetaDescriptor = MetaDescriptor {
+            value(STYLE_KEY, ValueType.STRING) {
                 multiple = true
             }
         }
 
-        public fun Vision.updateProperties(at: Name, item: MetaItem) {
-            when (item) {
-                is MetaItemValue -> {
-                    if (item.value == Null) {
-                        setProperty(at, null)
-                    } else
-                        setProperty(at, item)
-                }
-                is MetaItemNode -> item.node.items.forEach { (token, childItem) ->
-                    updateProperties(at + token, childItem)
-                }
+        public fun Vision.updateProperties(at: Name, item: Meta) {
+            setPropertyValue(at, item.value)
+            item.items.forEach { (token, item) ->
+                updateProperties(at + token, item)
             }
         }
 

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionChange.kt

@@ -21,7 +21,7 @@ public class VisionChangeBuilder : VisionContainerBuilder<Vision> {
 
     private var reset: Boolean = false
     private var vision: Vision? = null
-    private val propertyChange = MetaBuilder()
+    private val propertyChange = MutableMeta()
     private val children: HashMap<Name, VisionChangeBuilder> = HashMap()
 
     public fun isEmpty(): Boolean = propertyChange.isEmpty() && propertyChange.isEmpty() && children.isEmpty()
@@ -30,10 +30,10 @@ public class VisionChangeBuilder : VisionContainerBuilder<Vision> {
     private fun getOrPutChild(visionName: Name): VisionChangeBuilder =
         children.getOrPut(visionName) { VisionChangeBuilder() }
 
-    public fun propertyChanged(visionName: Name, propertyName: Name, item: MetaItem?) {
+    public fun propertyChanged(visionName: Name, propertyName: Name, item: Meta?) {
         if (visionName == Name.EMPTY) {
             //Write property removal as [Null]
-            propertyChange[propertyName] = (item ?: Null.asMetaItem())
+            propertyChange[propertyName] = (item ?: Meta(Null))
         } else {
             getOrPutChild(visionName).propertyChanged(Name.EMPTY, propertyName, item)
         }
@@ -90,7 +90,7 @@ private fun CoroutineScope.collectChange(
 
     //Collect properties change
     source.onPropertyChange(this) { propertyName ->
-        val newItem = source.ownProperties[propertyName]
+        val newItem = source.getOwnProperty(propertyName)
         collector().propertyChanged(name, propertyName, newItem)
     }
 

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionGroup.kt

@@ -75,12 +75,12 @@ public interface MutableVisionGroup : VisionGroup, VisionContainerBuilder<Vision
     public val structureChanges: Flow<StructureChange>
 }
 
-public operator fun <V : Vision> VisionContainer<V>.get(str: String): V? = get(str.toName())
+public operator fun <V : Vision> VisionContainer<V>.get(str: String): V? = get(Name.parse(str))
 
 public operator fun <V : Vision> VisionContainerBuilder<V>.set(token: NameToken, child: V?): Unit =
     set(token.asName(), child)
 
 public operator fun <V : Vision> VisionContainerBuilder<V>.set(key: String?, child: V?): Unit =
-    set(key?.toName(), child)
+    set(key?.let(Name::parse), child)
 
 public fun MutableVisionGroup.removeAll(): Unit = children.keys.map { it.asName() }.forEach { this[it] = null }

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionGroupBase.kt

@@ -131,15 +131,15 @@ public open class VisionGroupBase(
         }
     }
 
-    override fun update(change: VisionChange) {
+    override fun change(change: VisionChange) {
         change.children?.forEach { (name, change) ->
             when {
                 change.delete -> set(name, null)
                 change.vision != null -> set(name, change.vision)
-                else -> get(name)?.update(change)
+                else -> get(name)?.change(change)
             }
         }
-        super.update(change)
+        super.change(change)
     }
 }
 

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionManager.kt

@@ -8,12 +8,10 @@ import kotlinx.serialization.modules.polymorphic
 import kotlinx.serialization.modules.subclass
 import space.kscience.dataforge.context.*
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.node
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.toJson
-import space.kscience.dataforge.meta.toMetaItem
+import space.kscience.dataforge.meta.toMeta
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import kotlin.reflect.KClass
 
 public class VisionManager(meta: Meta) : AbstractPlugin(meta) {
@@ -48,12 +46,11 @@ public class VisionManager(meta: Meta) : AbstractPlugin(meta) {
         jsonFormat.encodeToJsonElement(visionSerializer, vision)
 
     //TODO remove double transformation with dedicated Meta serial format
-    public fun decodeFromMeta(meta: Meta, descriptor: NodeDescriptor? = null): Vision =
+    public fun decodeFromMeta(meta: Meta, descriptor: MetaDescriptor? = null): Vision =
         decodeFromJson(meta.toJson(descriptor))
 
-    public fun encodeToMeta(vision: Vision, descriptor: NodeDescriptor? = null): Meta =
-        encodeToJsonElement(vision).toMetaItem(descriptor).node
-            ?: error("Expected node, but value found. Check your serializer!")
+    public fun encodeToMeta(vision: Vision, descriptor: MetaDescriptor? = null): Meta =
+        encodeToJsonElement(vision).toMeta(descriptor)
 
     public companion object : PluginFactory<VisionManager> {
         override val tag: PluginTag = PluginTag(name = "vision", group = PluginTag.DATAFORGE_GROUP)
@@ -89,7 +86,7 @@ public abstract class VisionPlugin(meta: Meta = Meta.EMPTY) : AbstractPlugin(met
     protected abstract val visionSerializersModule: SerializersModule
 
     override fun content(target: String): Map<Name, Any> = when (target) {
-        VisionManager.VISION_SERIALIZER_MODULE_TARGET -> mapOf(tag.toString().toName() to visionSerializersModule)
+        VisionManager.VISION_SERIALIZER_MODULE_TARGET -> mapOf(Name.parse(tag.toString()) to visionSerializersModule)
         else -> super.content(target)
     }
 }

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionProperties.kt

@@ -0,0 +1,38 @@
+package space.kscience.visionforge
+
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MutableMeta
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.NameToken
+import space.kscience.dataforge.names.plus
+import space.kscience.dataforge.values.Value
+
+internal class VisionProperties(
+    val vision: Vision,
+    val rootName: Name,
+    val inherit: Boolean = false,
+    val includeStyles: Boolean = true,
+    val includeDefaults: Boolean = true,
+) : MutableMeta {
+
+    override val items: Map<NameToken, MutableMeta>
+        get() = vision.getProperty(rootName, inherit, includeStyles, includeDefaults)?.items?.mapValues {
+            VisionProperties(vision, rootName + it.key, inherit, includeStyles, includeDefaults)
+        } ?: emptyMap()
+
+    override var value: Value?
+        get() = vision.getProperty(rootName, inherit, includeStyles, includeDefaults)?.value
+        set(value) {
+            vision.setPropertyValue(rootName, value)
+        }
+
+    override fun getOrCreate(name: Name): MutableMeta = VisionProperties(vision, rootName + name)
+
+    override fun setMeta(name: Name, node: Meta?) {
+        vision.setPropertyNode(rootName + name, node)
+    }
+
+    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
+    override fun hashCode(): Int = Meta.hashCode(this)
+    override fun toString(): String = Meta.toString(this)
+}

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionPropertyContainer.kt

@@ -1,7 +1,11 @@
 package space.kscience.visionforge
 
-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.Configurable
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.ObservableMutableMeta
+import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.values.Value
 
 /**
  * Property containers are used to create a symmetric behaviors for vision properties and style builders
@@ -12,21 +16,34 @@ public interface VisionPropertyContainer<out V: Vision> {
         inherit: Boolean = false,
         includeStyles: Boolean = true,
         includeDefaults: Boolean = true,
-    ): MetaItem?
+    ): Meta?
 
-    public fun setProperty(name: Name, item: MetaItem?, notify: Boolean = true)
+    /**
+     * Replace the property node. If [node] is null remove node and its descendants
+     */
+    public fun setPropertyNode(name: Name, node: Meta?, notify: Boolean = true)
+
+    /**
+     * Set a value of specific property node
+     */
+    public fun setPropertyValue(name: Name, value: Value?, notify: Boolean = true)
 }
 
-public open class SimpleVisionPropertyContainer<out V: Vision>(protected val config: ObservableMeta): VisionPropertyContainer<V>{
+public open class SimpleVisionPropertyContainer<out V : Vision>(
+    override val meta: ObservableMutableMeta,
+) : VisionPropertyContainer<V>, Configurable {
     override fun getProperty(
         name: Name,
         inherit: Boolean,
         includeStyles: Boolean,
         includeDefaults: Boolean
-    ): MetaItem? = config[name]
+    ): Meta? = meta[name]
 
-    override fun setProperty(name: Name, item: MetaItem?, notify: Boolean) {
-        config[name] = item
+    override fun setPropertyNode(name: Name, node: Meta?, notify: Boolean) {
+        this.meta.setMeta(name, node)
     }
 
+    override fun setPropertyValue(name: Name, value: Value?, notify: Boolean) {
+        this.meta.setValue(name, value)
+    }
 }

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/VisionTagConsumer.kt

@@ -2,12 +2,13 @@ package space.kscience.visionforge.html
 
 import kotlinx.html.*
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MetaBuilder
 import space.kscience.dataforge.meta.MetaSerializer
+import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.meta.isEmpty
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.NameToken
+import space.kscience.dataforge.names.asName
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.VisionManager
 import kotlin.collections.set
@@ -25,7 +26,7 @@ public class VisionOutput @PublishedApi internal constructor(public val manager:
 
     //TODO expose a way to define required plugins.
 
-    public inline fun meta(block: MetaBuilder.() -> Unit) {
+    public inline fun meta(block: MutableMeta.() -> Unit) {
         this.meta = Meta(block)
     }
 }
@@ -94,11 +95,11 @@ public abstract class VisionTagConsumer<R>(
     public inline fun <T> TagConsumer<T>.vision(
         name: String = DEFAULT_VISION_NAME,
         visionProvider: VisionOutput.() -> Vision,
-    ): T = vision(name.toName(), visionProvider)
+    ): T = vision(Name.parse(name), visionProvider)
 
     public fun <T> TagConsumer<T>.vision(
         vision: Vision,
-    ): T = vision("vision[${vision.hashCode()}]".toName(), vision)
+    ): T = vision(NameToken("vision", vision.hashCode().toString()).asName(), vision)
 
     /**
      * Process the resulting object produced by [TagConsumer]

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/misc.kt

@@ -1,18 +1,20 @@
 package space.kscience.visionforge
 
-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.Laminate
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.boolean
+import space.kscience.dataforge.meta.isLeaf
 import space.kscience.dataforge.values.asValue
 
 @DslMarker
 public annotation class VisionBuilder
 
-public fun List<MetaItem?>.merge(): MetaItem? = when (val first = firstOrNull { it != null }) {
-    null -> null
-    is MetaItemValue -> first //fast search for first entry if it is value
-    is MetaItemNode -> {
-        //merge nodes if first encountered node is meta
-        val laminate: Laminate = Laminate(mapNotNull { it.node })
-        MetaItemNode(laminate)
+public fun List<Meta?>.merge(): Meta? {
+    val first = firstOrNull { it != null }
+    return when {
+        first == null -> null
+        first.isLeaf -> first //fast search for first entry if it is value
+        else -> Laminate(filterNotNull()) //merge nodes if first encountered node is meta
     }
 }
 
@@ -21,8 +23,4 @@ public fun List<MetaItem?>.merge(): MetaItem? = when (val first = firstOrNull {
  */
 public var Vision.visible: Boolean?
     get() = getProperty(Vision.VISIBLE_KEY).boolean
-    set(value) = setProperty(Vision.VISIBLE_KEY, value?.asValue())
-
-public fun Vision.configure(meta: Meta?): Unit = update(VisionChange(properties = meta))
-
-public fun Vision.configure(block: MetaBuilder.() -> Unit): Unit = configure(Meta(block))
+    set(value) = setPropertyValue(Vision.VISIBLE_KEY, value?.asValue())

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/schemeDesctiptors.kt

@@ -2,11 +2,11 @@ package space.kscience.visionforge
 
 import space.kscience.dataforge.meta.Scheme
 import space.kscience.dataforge.meta.SchemeSpec
-import space.kscience.dataforge.meta.asObservable
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.descriptors.NodeDescriptorBuilder
-import space.kscience.dataforge.meta.descriptors.ValueDescriptorBuilder
-import space.kscience.dataforge.meta.toMutableMeta
+import space.kscience.dataforge.meta.descriptors.Described
+import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
+import space.kscience.dataforge.meta.descriptors.item
+import space.kscience.dataforge.meta.descriptors.value
+import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.values.ValueType
 import kotlin.reflect.KProperty1
 import kotlin.reflect.typeOf
@@ -14,55 +14,53 @@ import kotlin.reflect.typeOf
 /**
  * TODO to be moved into the core
  */
-public inline fun <S : Scheme, reified T> NodeDescriptorBuilder.value(
+public inline fun <S : Scheme, reified T> MetaDescriptorBuilder.value(
     property: KProperty1<S, T>,
-    noinline block: ValueDescriptorBuilder.() -> Unit = {},
+    noinline block: MetaDescriptorBuilder.() -> Unit = {},
 ) {
     when (typeOf<T>()) {
         typeOf<Number>(), typeOf<Int>(), typeOf<Double>(), typeOf<Short>(), typeOf<Long>(), typeOf<Float>() ->
-            value(property.name) {
-                type(ValueType.NUMBER)
+            value(property.name, ValueType.NUMBER) {
                 block()
             }
         typeOf<Number?>(), typeOf<Int?>(), typeOf<Double?>(), typeOf<Short?>(), typeOf<Long?>(), typeOf<Float?>() ->
-            value(property.name) {
-                type(ValueType.NUMBER)
+            value(property.name, ValueType.NUMBER) {
                 block()
             }
-        typeOf<Boolean>() -> value(property.name) {
-            type(ValueType.BOOLEAN)
+        typeOf<Boolean>() -> value(property.name, ValueType.BOOLEAN) {
             block()
         }
         typeOf<List<Number>>(), typeOf<List<Int>>(), typeOf<List<Double>>(), typeOf<List<Short>>(), typeOf<List<Long>>(), typeOf<List<Float>>(),
         typeOf<IntArray>(), typeOf<DoubleArray>(), typeOf<ShortArray>(), typeOf<LongArray>(), typeOf<FloatArray>(),
-        -> value(property.name) {
-            type(ValueType.NUMBER)
+        -> value(property.name, ValueType.NUMBER) {
             multiple = true
             block()
         }
-        typeOf<String>() -> value(property.name) {
-            type(ValueType.STRING)
+        typeOf<String>() -> value(property.name, ValueType.STRING) {
             block()
         }
-        typeOf<List<String>>(), typeOf<Array<String>>() -> value(property.name) {
-            type(ValueType.STRING)
+        typeOf<List<String>>(), typeOf<Array<String>>() -> value(property.name, ValueType.STRING) {
             multiple = true
             block()
         }
-        else -> value(property.name, block)
+        else -> item(property.name, block)
     }
 }
 
-public fun NodeDescriptor.copy(block: NodeDescriptorBuilder.() -> Unit = {}): NodeDescriptor {
-    return NodeDescriptorBuilder(toMeta().toMutableMeta().asObservable()).apply(block)
+public fun MetaDescriptorBuilder.item(
+    key: String,
+    described: Described,
+    block: MetaDescriptorBuilder.() -> Unit = {},
+) {
+    described.descriptor?.let {
+        item(Name.parse(key), it, block)
+    }
 }
 
-public inline fun <S : Scheme, reified T : Scheme> NodeDescriptorBuilder.scheme(
+public inline fun <S : Scheme, reified T : Scheme> MetaDescriptorBuilder.scheme(
     property: KProperty1<S, T>,
     spec: SchemeSpec<T>,
-    noinline block: NodeDescriptorBuilder.() -> Unit = {},
+    noinline block: MetaDescriptorBuilder.() -> Unit = {},
 ) {
-    spec.descriptor?.let { descriptor ->
-        item(property.name, descriptor.copy(block))
-    }
+    item(property.name, spec, block)
 }

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/visionDelegates.kt

@@ -0,0 +1,93 @@
+package space.kscience.visionforge
+
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.values.Value
+import space.kscience.dataforge.values.number
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+public fun Vision.propertyNode(
+    name: Name? = null,
+    inherit: Boolean = false,
+    includeStyles: Boolean = true,
+    includeDefaults: Boolean = true,
+): ReadWriteProperty<Any?, Meta?> = object : ReadWriteProperty<Any?, Meta?> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? =
+        getProperty(name ?: Name.parse(property.name), inherit, includeStyles, includeDefaults)
+
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Meta?) {
+        setPropertyNode(name ?: Name.parse(property.name), value)
+    }
+}
+
+public fun <T> Vision.propertyNode(
+    converter: MetaConverter<T>,
+    name: Name? = null,
+    inherit: Boolean = false,
+    includeStyles: Boolean = true,
+    includeDefaults: Boolean = true,
+): ReadWriteProperty<Any?, T?> = object : ReadWriteProperty<Any?, T?> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): T? = getProperty(
+        name ?: Name.parse(property.name),
+        inherit,
+        includeStyles,
+        includeDefaults
+    )?.let(converter::metaToObject)
+
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: T?) {
+        setPropertyNode(name ?: Name.parse(property.name), value?.let(converter::objectToMeta))
+    }
+}
+
+public fun Vision.propertyValue(
+    name: Name? = null,
+    inherit: Boolean = false,
+    includeStyles: Boolean = true,
+    includeDefaults: Boolean = true,
+): ReadWriteProperty<Any?, Value?> = object : ReadWriteProperty<Any?, Value?> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Value? =
+        getProperty(name ?: Name.parse(property.name), inherit, includeStyles, includeDefaults)?.value
+
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Value?) {
+        setPropertyValue(name ?: Name.parse(property.name), value)
+    }
+}
+
+public fun <T> Vision.propertyValue(
+    name: Name? = null,
+    inherit: Boolean = false,
+    includeStyles: Boolean = true,
+    includeDefaults: Boolean = true,
+    setter: (T) -> Value? = { it?.let(Value::of) },
+    getter: (Value?) -> T,
+): ReadWriteProperty<Any?, T> = object : ReadWriteProperty<Any?, T> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): T = getProperty(
+        name ?: Name.parse(property.name),
+        inherit,
+        includeStyles,
+        includeDefaults
+    )?.value.let(getter)
+
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
+        setPropertyValue(name ?: Name.parse(property.name), value?.let(setter))
+    }
+}
+
+public fun Vision.numberProperty(
+    name: Name? = null,
+    inherit: Boolean = false,
+    includeStyles: Boolean = true,
+    includeDefaults: Boolean = true
+): ReadWriteProperty<Any?, Number?> = propertyValue(name, inherit, includeStyles, includeDefaults) { it?.number }
+
+public fun Vision.numberProperty(
+    name: Name? = null,
+    inherit: Boolean = false,
+    includeStyles: Boolean = true,
+    includeDefaults: Boolean = true,
+    default: () -> Number
+): ReadWriteProperty<Any?, Number> = propertyValue(name, inherit, includeStyles, includeDefaults) {
+    it?.number ?: default()
+}

visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/visionDescriptor.kt

@@ -2,87 +2,63 @@ package space.kscience.visionforge
 
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.meta.descriptors.*
-import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.values.ValueType
+import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.values.asValue
 
 private const val INHERITED_DESCRIPTOR_ATTRIBUTE = "inherited"
 private const val STYLE_DESCRIPTOR_ATTRIBUTE = "useStyles"
 
-public val ItemDescriptor.inherited: Boolean
+public val MetaDescriptor.inherited: Boolean
     get() = attributes[INHERITED_DESCRIPTOR_ATTRIBUTE].boolean ?: false
 
-public var ItemDescriptorBuilder.inherited: Boolean
+public var MetaDescriptorBuilder.inherited: Boolean
     get() = attributes[INHERITED_DESCRIPTOR_ATTRIBUTE].boolean ?: false
-    set(value) = attributes {
-        set(INHERITED_DESCRIPTOR_ATTRIBUTE, value)
-    }
+    set(value) = attributes.set(INHERITED_DESCRIPTOR_ATTRIBUTE, value)
 
-public val ItemDescriptor.usesStyles: Boolean
+
+public val MetaDescriptor.usesStyles: Boolean
     get() = attributes[STYLE_DESCRIPTOR_ATTRIBUTE].boolean ?: true
 
-public var ItemDescriptorBuilder.usesStyles: Boolean
+public var MetaDescriptorBuilder.usesStyles: Boolean
     get() = attributes[STYLE_DESCRIPTOR_ATTRIBUTE].boolean ?: true
-    set(value) = attributes {
-        set(STYLE_DESCRIPTOR_ATTRIBUTE, value)
-    }
+    set(value) = attributes.set(STYLE_DESCRIPTOR_ATTRIBUTE, value)
 
 
 public val Vision.describedProperties: Meta
     get() = Meta {
-        descriptor?.items?.forEach { (key, descriptor) ->
-            key put getProperty(key, inherit = descriptor.inherited)
+        descriptor?.children?.forEach { (key, descriptor) ->
+            this.setMeta(key.asName(), getProperty(key, inherit = descriptor.inherited))
         }
     }
 
-public val ValueDescriptor.widget: Meta
-    get() = attributes["widget"].node ?: Meta.EMPTY
+public val MetaDescriptor.widget: Meta
+    get() = attributes["widget"] ?: Meta.EMPTY
 
 /**
  * Extension property to access the "widget" key of [ValueDescriptor]
  */
-public var ValueDescriptorBuilder.widget: Meta
-    get() = attributes["widget"].node ?: Meta.EMPTY
+public var MetaDescriptorBuilder.widget: Meta
+    get() = attributes["widget"] ?: Meta.EMPTY
     set(value) {
-        attributes {
-            set("widget", value)
-        }
+        attributes["widget"] = value
     }
 
-public val ValueDescriptor.widgetType: String?
+public val MetaDescriptor.widgetType: String?
     get() = attributes["widget.type"].string
 
 /**
  * Extension property to access the "widget.type" key of [ValueDescriptor]
  */
-public var ValueDescriptorBuilder.widgetType: String?
+public var MetaDescriptorBuilder.widgetType: String?
     get() = attributes["widget.type"].string
     set(value) {
-        attributes {
-            set("widget.type", value)
-        }
+        attributes["widget.type"] = value?.asValue()
     }
 
 /**
  * If true, this item is hidden in property editor. Default is false
  */
-public val ItemDescriptor.hidden: Boolean
+public val MetaDescriptor.hidden: Boolean
     get() = attributes["widget.hide"].boolean ?: false
 
-public fun ItemDescriptorBuilder.hide(): Unit = attributes {
-    set("widget.hide", true)
-}
-
-
-public inline fun <reified E : Enum<E>> NodeDescriptorBuilder.enum(
-    key: Name,
-    default: E?,
-    crossinline modifier: ValueDescriptorBuilder.() -> Unit = {},
-): Unit = value(key) {
-    type(ValueType.STRING)
-    default?.let {
-        default(default)
-    }
-    allowedValues = enumValues<E>().map { it.asValue() }
-    modifier()
-}
+public fun MetaDescriptorBuilder.hide(): Unit = attributes.set("widget.hide", true)

visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/html/HtmlTagTest.kt

@@ -57,7 +57,7 @@ class HtmlTagTest {
         div {
             h2 { +"Properties" }
             ul {
-                (vision as? VisionBase)?.meta?.items?.forEach {
+                (vision as? VisionBase)?.meta()?.items?.forEach {
                     li {
                         a { +it.key.toString() }
                         p { +it.value.toString() }

visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/VisionClient.kt

@@ -92,7 +92,7 @@ public class VisionClient : AbstractPlugin() {
                             }
 
                             logger.debug { "Got update $change for output with name $name" }
-                            vision.update(change)
+                            vision.change(change)
                         } else {
                             console.error("WebSocket message data is not a string")
                         }

visionforge-fx/src/main/kotlin/space/kscience/visionforge/FXPlugin.kt

@@ -115,5 +115,5 @@ public class ApplicationSurrogate : App() {
 }
 
 public fun Context.display(width: Double = 800.0, height: Double = 600.0, component: () -> UIComponent) {
-    plugins.fetch(FXPlugin).display(component(), width, height)
+    fetch(FXPlugin).display(component(), width, height)
 }

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/ComboBoxValueChooser.kt

@@ -9,8 +9,8 @@ import javafx.collections.FXCollections
 import javafx.scene.control.ComboBox
 import javafx.util.StringConverter
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.descriptors.allowedValues
 import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.value
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.values.Value
@@ -56,7 +56,7 @@ public class ComboBoxValueChooser(public val values: Collection<Value>? = null)
         override val name: Name = "combo".asName()
 
         override fun invoke(meta: Meta): ValueChooser =
-            ComboBoxValueChooser(meta["values"].value?.list)
+            ComboBoxValueChooser(meta["values"]?.value?.list)
     }
 
 }

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/ConfigEditor.kt

@@ -1,189 +0,0 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
-package space.kscience.visionforge.editor
-
-import de.jensd.fx.glyphs.fontawesome.FontAwesomeIcon
-import de.jensd.fx.glyphs.fontawesome.FontAwesomeIconView
-import javafx.scene.Node
-import javafx.scene.control.*
-import javafx.scene.control.cell.TextFieldTreeTableCell
-import javafx.scene.layout.BorderPane
-import javafx.scene.layout.HBox
-import javafx.scene.layout.Priority
-import javafx.scene.paint.Color
-import javafx.scene.text.Text
-import space.kscience.dataforge.context.Global
-import space.kscience.dataforge.meta.Config
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.names.NameToken
-import space.kscience.visionforge.dfIconView
-import tornadofx.*
-
-/**
- * A configuration editor fragment
- *
- * @author Alexander Nozik
- */
-public class ConfigEditor(
-    public val rootNode: FXMetaNode<Config>,
-    public val allowNew: Boolean = true,
-    title: String = "Configuration editor"
-) : Fragment(title = title, icon = dfIconView) {
-    //TODO replace parameters by properties
-
-    public constructor(config: Config, descriptor: NodeDescriptor?, title: String = "Configuration editor") :
-            this(FXMeta.root(config, descriptor = descriptor), title = title)
-
-    override val root: BorderPane = borderpane {
-        center = treetableview<FXMeta<Config>> {
-            root = TreeItem(rootNode)
-            root.isExpanded = true
-            sortMode = TreeSortMode.ALL_DESCENDANTS
-            columnResizePolicy = TreeTableView.CONSTRAINED_RESIZE_POLICY
-            populate {
-                when (val fxMeta = it.value) {
-                    is FXMetaNode -> {
-                        fxMeta.children
-                    }
-                    is FXMetaValue -> null
-                }
-            }
-            column("Name", FXMeta<Config>::name) {
-                setCellFactory {
-                    object : TextFieldTreeTableCell<FXMeta<Config>, NameToken>() {
-                        override fun updateItem(item: NameToken?, empty: Boolean) {
-                            super.updateItem(item, empty)
-                            contextMenu?.items?.removeIf { it.text == "Remove" }
-                            if (!empty) {
-                                if (treeTableRow.item != null) {
-                                    textFillProperty().bind(treeTableRow.item.hasValue.objectBinding {
-                                        if (it == true) {
-                                            Color.BLACK
-                                        } else {
-                                            Color.GRAY
-                                        }
-                                    })
-                                    if (treeTableRow.treeItem.value.parent != null && treeTableRow.treeItem.value.hasValue.get()) {
-                                        contextmenu {
-                                            item("Remove") {
-                                                action {
-                                                    treeTableRow.item.remove()
-                                                }
-                                            }
-                                        }
-                                    }
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-
-            column("Value") { param: TreeTableColumn.CellDataFeatures<FXMeta<Config>, FXMeta<Config>> ->
-                param.value.valueProperty()
-            }.setCellFactory {
-                ValueCell()
-            }
-
-            column("Description") { param: TreeTableColumn.CellDataFeatures<FXMeta<Config>, String> -> param.value.value.descriptionProperty }
-                .setCellFactory { param: TreeTableColumn<FXMeta<Config>, String> ->
-                    val cell = TreeTableCell<FXMeta<Config>, String>()
-                    val text = Text()
-                    cell.graphic = text
-                    cell.prefHeight = Control.USE_COMPUTED_SIZE
-                    text.wrappingWidthProperty().bind(param.widthProperty())
-                    text.textProperty().bind(cell.itemProperty())
-                    cell
-                }
-        }
-    }
-
-    private fun showNodeDialog(): String? {
-        val dialog = TextInputDialog()
-        dialog.title = "Node name selection"
-        dialog.contentText = "Enter a name for new node: "
-        dialog.headerText = null
-
-        val result = dialog.showAndWait()
-        return result.orElse(null)
-    }
-
-    private fun showValueDialog(): String? {
-        val dialog = TextInputDialog()
-        dialog.title = "Value name selection"
-        dialog.contentText = "Enter a name for new value: "
-        dialog.headerText = null
-
-        val result = dialog.showAndWait()
-        return result.orElse(null)
-    }
-
-    private inner class ValueCell : TreeTableCell<FXMeta<Config>, FXMeta<Config>?>() {
-
-        public override fun updateItem(item: FXMeta<Config>?, empty: Boolean) {
-            if (!empty) {
-                if (item != null) {
-                    when (item) {
-                        is FXMetaValue<Config> -> {
-                            text = null
-                            val chooser = ValueChooser.build(
-                                Global,
-                                item.valueProperty,
-                                item.descriptor
-                            ) {
-                                item.set(it)
-                            }
-                            graphic = chooser.node
-                        }
-                        is FXMetaNode<Config> -> {
-                            if (allowNew) {
-                                text = null
-                                graphic = HBox().apply {
-                                    val glyph: Node = FontAwesomeIconView(FontAwesomeIcon.PLUS_CIRCLE)
-                                    button("node", graphic = glyph) {
-                                        hgrow = Priority.ALWAYS
-                                        maxWidth = Double.POSITIVE_INFINITY
-                                        action {
-                                            showNodeDialog()?.let {
-                                                item.addNode(it)
-                                            }
-                                        }
-                                    }
-                                    button("value", graphic = FontAwesomeIconView(FontAwesomeIcon.PLUS_SQUARE)) {
-                                        hgrow = Priority.ALWAYS
-                                        maxWidth = Double.POSITIVE_INFINITY
-                                        action {
-                                            showValueDialog()?.let {
-                                                item.addValue(it)
-                                            }
-                                        }
-                                    }
-                                }
-                            } else {
-                                text = ""
-                            }
-                        }
-                    }
-
-                } else {
-                    text = null
-                    graphic = null
-                }
-            } else {
-                text = null
-                graphic = null
-            }
-        }
-
-    }
-
-    companion object {
-        /**
-         * The tag not to display node or value in configurator
-         */
-        const val NO_CONFIGURATOR_TAG = "nocfg"
-    }
-}

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/FXMeta.kt

@@ -1,223 +0,0 @@
-package space.kscience.visionforge.editor
-
-import javafx.beans.binding.ListBinding
-import javafx.beans.binding.ObjectBinding
-import javafx.beans.property.SimpleObjectProperty
-import javafx.beans.value.ObservableBooleanValue
-import javafx.beans.value.ObservableStringValue
-import javafx.collections.ObservableList
-import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.ItemDescriptor
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.descriptors.ValueDescriptor
-import space.kscience.dataforge.names.*
-import space.kscience.dataforge.values.Null
-import space.kscience.dataforge.values.Value
-import tornadofx.*
-
-/**
- * A display for meta and descriptor
- */
-sealed class FXMeta<M : TypedMeta<M>> : Comparable<FXMeta<*>> {
-    abstract val name: NameToken
-    abstract val parent: FXMetaNode<M>?
-    abstract val descriptionProperty: ObservableStringValue
-    abstract val descriptor: ItemDescriptor?
-
-    abstract val hasValue: ObservableBooleanValue
-
-    override fun compareTo(other: FXMeta<*>): Int {
-        return if (this.hasValue.get() == other.hasValue.get()) {
-            this.name.toString().compareTo(other.name.toString())
-        } else {
-            this.hasValue.get().compareTo(other.hasValue.get())
-        }
-    }
-
-    companion object {
-        fun <M : TypedMeta<M>> root(
-            node: M,
-            descriptor: NodeDescriptor? = null,
-            rootName: String = "root"
-        ): FXMetaNode<M> =
-            FXMetaNode(NameToken(rootName), null, node, descriptor)
-
-        fun root(node: Meta, descriptor: NodeDescriptor? = null, rootName: String = "root"): FXMetaNode<SealedMeta> =
-            root(node.seal(), descriptor, rootName)
-    }
-}
-
-class FXMetaNode<M : TypedMeta<M>>(
-    override val name: NameToken,
-    override val parent: FXMetaNode<M>?,
-    nodeValue: M? = null,
-    descriptorValue: NodeDescriptor? = null
-) : FXMeta<M>() {
-
-    /**
-     * A descriptor that could be manually set to the node
-     */
-    private val innerDescriptorProperty = SimpleObjectProperty(descriptorValue)
-
-    /**
-     * Actual descriptor which holds value inferred from parrent
-     */
-    val descriptorProperty = objectBinding(innerDescriptorProperty) {
-        value ?: parent?.descriptor?.nodes?.get(this@FXMetaNode.name.body)
-    }
-
-    override val descriptor: NodeDescriptor? by descriptorProperty
-
-    private val innerNodeProperty = SimpleObjectProperty(nodeValue)
-
-    val nodeProperty: ObjectBinding<M?> = objectBinding(innerNodeProperty) {
-        value ?: parent?.node?.get(this@FXMetaNode.name).node
-    }
-
-    val node: M? by nodeProperty
-
-    override val descriptionProperty = innerDescriptorProperty.stringBinding { it?.info ?: "" }
-
-    override val hasValue: ObservableBooleanValue = nodeProperty.booleanBinding { it != null }
-
-    private val filter: (FXMeta<M>) -> Boolean = { cfg ->
-        !(cfg.descriptor?.attributes?.get(ConfigEditor.NO_CONFIGURATOR_TAG)?.boolean ?: false)
-    }
-
-    val children = object : ListBinding<FXMeta<M>>() {
-
-        init {
-            bind(nodeProperty, descriptorProperty)
-
-            val listener: (Name, MetaItem?, MetaItem?) -> Unit = { name, _, _ ->
-                if (name.length == 1) invalidate()
-            }
-
-            (node as? Config)?.onChange(this, listener)
-
-            nodeProperty.addListener { _, oldValue, newValue ->
-                if (newValue == null) {
-                    (oldValue as? Config)?.removeListener(this)
-                }
-
-                if (newValue is Config) {
-                    newValue.onChange(this, listener)
-                }
-            }
-        }
-
-        override fun computeValue(): ObservableList<FXMeta<M>> {
-            val nodeKeys = node?.items?.keys?.toSet() ?: emptySet()
-            val descriptorKeys = descriptor?.items?.keys?.map { NameToken(it) } ?: emptyList()
-            val keys: Set<NameToken> = nodeKeys + descriptorKeys
-
-            val items = keys.map { token ->
-                val actualItem = node?.items?.get(token)
-                val actualDescriptor = descriptor?.items?.get(token.body)
-
-                if (actualItem is MetaItemNode || actualDescriptor is NodeDescriptor) {
-                    FXMetaNode(token, this@FXMetaNode)
-                } else {
-                    FXMetaValue(token, this@FXMetaNode)
-                }
-            }
-
-            return items.filter(filter).asObservable()
-        }
-    }
-
-    init {
-        if (parent != null) {
-            parent.descriptorProperty.onChange { descriptorProperty.invalidate() }
-            parent.nodeProperty.onChange { nodeProperty.invalidate() }
-        }
-    }
-}
-
-public class FXMetaValue<M : TypedMeta<M>>(
-    override val name: NameToken,
-    override val parent: FXMetaNode<M>
-) : FXMeta<M>() {
-
-    public val descriptorProperty = parent.descriptorProperty.objectBinding {
-        it?.values?.get(name.body)
-    }
-
-    /**
-     * A descriptor that could be manually set to the node
-     */
-    override val descriptor: ValueDescriptor? by descriptorProperty
-
-    //private val innerValueProperty = SimpleObjectProperty(value)
-
-    public val valueProperty = descriptorProperty.objectBinding { descriptor ->
-        parent.node?.get(name).value ?: descriptor?.default
-    }
-
-    override val hasValue: ObservableBooleanValue = parent.nodeProperty.booleanBinding { it?.get(name) != null }
-
-    public val value by valueProperty
-
-    override val descriptionProperty = descriptorProperty.stringBinding { it?.info ?: "" }
-}
-
-public fun <M : MutableMeta<M>> FXMetaNode<M>.remove(name: NameToken) {
-    node?.remove(name.asName())
-    children.invalidate()
-}
-
-private fun <M : MutableMeta<M>> M.createEmptyNode(token: NameToken, append: Boolean): M {
-    return if (append && token.hasIndex()) {
-        val name = token.asName()
-        val index = (getIndexed(name).keys.mapNotNull { it?.toIntOrNull() }.maxOrNull() ?: -1) + 1
-        val newName = name.withIndex(index.toString())
-        set(newName, Meta.EMPTY)
-        get(newName).node!!
-    } else {
-        this.set(token.asName(), Meta.EMPTY)
-        //FIXME possible concurrency bug
-        get(token).node!!
-    }
-}
-
-fun <M : MutableMeta<M>> FXMetaNode<out M>.getOrCreateNode(): M {
-    val node = node
-    return when {
-        node != null -> node
-        parent != null -> parent.getOrCreateNode().createEmptyNode(this.name, descriptor?.multiple == true).also {
-            parent.children.invalidate()
-        }
-        else -> kotlin.error("Orphan empty node is not allowed")
-    }
-
-}
-
-fun <M : MutableMeta<M>> FXMeta<M>.remove() {
-    parent?.node?.remove(name.asName())
-}
-
-fun <M : MutableMeta<M>> FXMetaNode<M>.addValue(key: String) {
-    val parent = getOrCreateNode()
-    if (descriptor?.multiple == true) {
-        parent.append(key, Null)
-    } else {
-        parent[key] = Null
-    }
-}
-
-fun <M : MutableMeta<M>> FXMetaNode<M>.addNode(key: String) {
-    val parent = getOrCreateNode()
-    if (descriptor?.multiple == true) {
-        parent.append(key, Meta.EMPTY)
-    } else {
-        parent[key] = Meta.EMPTY
-    }
-}
-
-fun <M : MutableMeta<M>> FXMetaValue<M>.set(value: Value?) {
-    if (descriptor?.multiple == true) {
-        parent.getOrCreateNode().append(this.name.body, value)
-    } else {
-        parent.getOrCreateNode()[this.name] = value
-    }
-}

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/FXMetaModel.kt

@@ -0,0 +1,217 @@
+package space.kscience.visionforge.editor
+
+import javafx.beans.binding.Binding
+import javafx.beans.binding.BooleanBinding
+import javafx.beans.binding.ListBinding
+import javafx.beans.property.SimpleObjectProperty
+import javafx.collections.ObservableList
+import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.get
+import space.kscience.dataforge.names.*
+import space.kscience.dataforge.values.Value
+import tornadofx.*
+
+/**
+ * A display for meta and descriptor
+ */
+public class FXMetaModel<M : Meta>(
+    public val root: M,
+    public val rootDescriptor: MetaDescriptor?,
+    public val nodeName: Name,
+    public val title: String = nodeName.lastOrNull()?.toString() ?: "Meta"
+) : Comparable<FXMetaModel<*>> {
+
+    private val existingNode = SimpleObjectProperty<Meta>(root[nodeName])
+
+    public val children: ListBinding<FXMetaModel<M>> = object : ListBinding<FXMetaModel<M>>() {
+        override fun computeValue(): ObservableList<FXMetaModel<M>> {
+            val nodeKeys = existingNode.get().items.keys
+            val descriptorKeys = descriptor?.children?.keys?.map { NameToken(it) } ?: emptySet()
+            return (nodeKeys + descriptorKeys).map {
+                FXMetaModel(
+                    root,
+                    rootDescriptor,
+                    nodeName + it
+                )
+            }.filter(filter).asObservable()
+        }
+    }
+
+    init {
+        //add listener to the root node if possible
+        if (root is ObservableMeta) {
+            root.onChange(this) { changed ->
+                if (changed.startsWith(nodeName)) {
+                    if (nodeName.length == changed.length) existingNode.set(root[nodeName])
+                    else if (changed.length == nodeName.length + 1) children.invalidate()
+                }
+            }
+        }
+    }
+
+    public val descriptor: MetaDescriptor? = rootDescriptor?.get(nodeName)
+
+    public val existsProperty: BooleanBinding = existingNode.isNotNull
+
+    public val exists: Boolean by existsProperty
+
+    public val valueProperty: Binding<Value?> = existingNode.objectBinding {
+        existingNode.get().value ?: descriptor?.defaultValue
+    }
+
+    override fun compareTo(other: FXMetaModel<*>): Int = if (this.exists == other.exists) {
+        this.nodeName.toString().compareTo(other.nodeName.toString())
+    } else {
+        this.exists.compareTo(other.exists)
+    }
+
+    public companion object {
+        private val filter: (FXMetaModel<*>) -> Boolean = { cfg ->
+            !(cfg.descriptor?.attributes?.get(MutableMetaEditor.NO_CONFIGURATOR_TAG)?.boolean ?: false)
+        }
+
+        public fun <M : Meta> root(
+            node: M,
+            descriptor: MetaDescriptor? = null,
+            rootName: String = "root"
+        ): FXMetaModel<M> = FXMetaModel(node, descriptor, Name.EMPTY, title = rootName)
+    }
+
+//    /**
+//     * A descriptor that could be manually set to the node
+//     */
+//    private val innerDescriptorProperty = SimpleObjectProperty(descriptorValue)
+//
+//    /**
+//     * Actual descriptor which holds value inferred from parrent
+//     */
+//    val descriptorProperty: ObjectBinding<MetaDescriptor?> = objectBinding(innerDescriptorProperty) {
+//        value ?: parent?.descriptor?.get(this@FXMeta.name.body)
+//    }
+//
+//    val descriptor: MetaDescriptor? by descriptorProperty
+//
+//    private val innerNodeProperty = SimpleObjectProperty(nodeValue)
+//
+//    val nodeProperty: ObjectBinding<M> = objectBinding(innerNodeProperty) {
+//        value ?: parent?.node?.get(this@FXMeta.name)
+//    }
+//
+//    val node by nodeProperty
+//
+//    val hasValue: ObservableBooleanValue = nodeProperty.booleanBinding { it != null }
+//
+//    private val filter: (FXMeta<M>) -> Boolean = { cfg ->
+//        !(cfg.descriptor?.attributes?.get(MutableMetaEditor.NO_CONFIGURATOR_TAG)?.boolean ?: false)
+//    }
+//
+//    val children: ListBinding<FXMeta<M>> = object : ListBinding<FXMeta<M>>() {
+//
+//        init {
+//            bind(nodeProperty, descriptorProperty)
+//
+//            val listener: Meta.(Name) -> Unit = { name ->
+//                if (name.length == 1) invalidate()
+//            }
+//
+//            (node as? ObservableMeta)?.onChange(this, listener)
+//
+//            nodeProperty.addListener { _, oldValue, newValue ->
+//                if (newValue == null) {
+//                    (oldValue as? ObservableMeta)?.removeListener(this)
+//                }
+//
+//                if (newValue is ObservableMeta) {
+//                    newValue.onChange(this, listener)
+//                }
+//            }
+//        }
+//
+//        override fun computeValue(): ObservableList<FXMeta<M>> {
+//            val nodeKeys = node?.items?.keys?.toSet() ?: emptySet()
+//            val descriptorKeys = descriptor?.children?.keys?.map { NameToken(it) } ?: emptyList()
+//            val keys: Set<NameToken> = nodeKeys + descriptorKeys
+//
+//            val items = keys.map { token ->
+//                val actualItem = node?.items?.get(token)
+//                val actualDescriptor = descriptor?.children?.get(token.body)
+//
+//                if (actualItem is MetaNode) {
+//                    FXMetaNode(token, this@FXMetaNode)
+//                } else {
+//                    FXMetaValue(token, this@FXMetaNode)
+//                }
+//            }
+//
+//            return items.filter(filter).asObservable()
+//        }
+//    }
+//
+//    init {
+//        if (parent != null) {
+//            parent.descriptorProperty.onChange { descriptorProperty.invalidate() }
+//            parent.nodeProperty.onChange { nodeProperty.invalidate() }
+//        }
+//    }
+//
+}
+
+//
+//internal fun <M : MutableMeta> FXMeta<M>.remove(name: NameToken) {
+//    node?.remove(name.asName())
+//    children.invalidate()
+//}
+//
+//private fun <M : MutableMeta> M.createEmptyNode(token: NameToken, append: Boolean): M {
+//    return if (append && token.hasIndex()) {
+//        val name = token.asName()
+//        val index = (getIndexed(name).keys.mapNotNull { it?.toIntOrNull() }.maxOrNull() ?: -1) + 1
+//        val newName = name.withIndex(index.toString())
+//        set(newName, Meta.EMPTY)
+//        get(newName).node
+//    } else {
+//        this.set(token.asName(), Meta.EMPTY)
+//        //FIXME possible concurrency bug
+//        get(token).node
+//    }
+//}
+//
+//internal fun <M : MutableMeta> FXMeta<out M>.getOrCreateNode(): M {
+//    val node = node
+//    return when {
+//        node != null -> node
+//        parent != null -> parent.getOrCreateNode().createEmptyNode(this.name, descriptor?.multiple == true).also {
+//            parent.children.invalidate()
+//        }
+//        else -> kotlin.error("Orphan empty node is not allowed")
+//    }
+//
+//}
+
+internal fun <M : MutableMeta> FXMetaModel<M>.remove() {
+    root.remove(nodeName)
+}
+
+//
+//internal fun <M : MutableMeta> FXMeta<M>.addValue(key: String) {
+//    val parent = getOrCreateNode()
+//    if (descriptor?.multiple == true) {
+//        parent.append(key, Null)
+//    } else {
+//        parent[key] = Null
+//    }
+//}
+//
+//internal fun <M : MutableMeta> FXMeta<M>.addNode(key: String) {
+//    val parent = getOrCreateNode()
+//    if (descriptor?.multiple == true) {
+//        parent.append(key, Meta.EMPTY)
+//    } else {
+//        parent[key] = Meta.EMPTY
+//    }
+//}
+//
+internal fun <M : MutableMeta> FXMetaModel<M>.setValue(value: Value?) {
+    root.setValue(nodeName, value)
+}

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/MetaViewer.kt

@@ -16,45 +16,42 @@
 
 package space.kscience.visionforge.editor
 
-import javafx.beans.property.SimpleStringProperty
 import javafx.scene.control.TreeItem
 import javafx.scene.control.TreeSortMode
 import javafx.scene.control.TreeTableView
+import javafx.scene.layout.BorderPane
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.values.string
 import space.kscience.visionforge.dfIconView
 import tornadofx.*
 
-class MetaViewer(val rootNode: FXMetaNode<*>, title: String = "Meta viewer") : Fragment(title,
-    dfIconView
-) {
-    constructor(meta: Meta, title: String = "Meta viewer"): this(
-        FXMeta.root(
-            meta
-        ),title = title)
+public class MetaViewer(
+    private val rootNode: FXMetaModel<Meta>,
+    title: String = "Meta viewer"
+) : Fragment(title, dfIconView) {
 
-    override val root = borderpane {
+    public constructor(meta: Meta, title: String = "Meta viewer") : this(
+        FXMetaModel.root(
+            meta
+        ), title = title
+    )
+
+    override val root: BorderPane = borderpane {
         center {
-            treetableview<FXMeta<*>> {
+            treetableview<FXMetaModel<*>> {
                 isShowRoot = false
                 root = TreeItem(rootNode)
                 populate {
-                    when (val fxMeta = it.value) {
-                        is FXMetaNode -> {
+                    val fxMeta = it.value
                     fxMeta.children
                 }
-                        is FXMetaValue -> null
-                    }
-                }
                 root.isExpanded = true
                 sortMode = TreeSortMode.ALL_DESCENDANTS
                 columnResizePolicy = TreeTableView.CONSTRAINED_RESIZE_POLICY
-                column("Name", FXMeta<*>::name)
-                column<FXMeta<*>, String>("Value") { cellDataFeatures ->
-                    when (val item = cellDataFeatures.value.value) {
-                        is FXMetaValue -> item.valueProperty.stringBinding { it?.string ?: "" }
-                        is FXMetaNode -> SimpleStringProperty("[node]")
-                    }
+                column("Name", FXMetaModel<*>::title)
+                column<FXMetaModel<*>, String>("Value") { cellDataFeatures ->
+                    val item = cellDataFeatures.value.value
+                    item.valueProperty.stringBinding { it?.string ?: "" }
                 }
             }
         }

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/MutableMetaEditor.kt

@@ -0,0 +1,193 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package space.kscience.visionforge.editor
+
+import javafx.scene.control.*
+import javafx.scene.control.cell.TextFieldTreeTableCell
+import javafx.scene.layout.BorderPane
+import javafx.scene.paint.Color
+import javafx.scene.text.Text
+import space.kscience.dataforge.context.Global
+import space.kscience.dataforge.meta.MutableMeta
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.visionforge.dfIconView
+import tornadofx.*
+
+/**
+ * A Configuration editor fragment
+ *
+ * @author Alexander Nozik
+ */
+public class MutableMetaEditor(
+    public val rootNode: FXMetaModel<MutableMeta>,
+    public val allowNew: Boolean = true,
+    title: String = "Configuration editor"
+) : Fragment(title = title, icon = dfIconView) {
+    //TODO replace parameters by properties
+
+    public constructor(
+        MutableMeta: MutableMeta,
+        descriptor: MetaDescriptor?,
+        title: String = "Configuration editor"
+    ) :
+            this(FXMetaModel.root(MutableMeta, descriptor = descriptor), title = title)
+
+    override val root: BorderPane = borderpane {
+        center = treetableview<FXMetaModel<MutableMeta>> {
+            root = TreeItem(rootNode)
+            root.isExpanded = true
+            sortMode = TreeSortMode.ALL_DESCENDANTS
+            columnResizePolicy = TreeTableView.CONSTRAINED_RESIZE_POLICY
+            populate {
+                it.value.children
+            }
+            column("Name", FXMetaModel<MutableMeta>::title) {
+                setCellFactory {
+                    object : TextFieldTreeTableCell<FXMetaModel<MutableMeta>, String>() {
+                        override fun updateItem(item: String?, empty: Boolean) {
+                            super.updateItem(item, empty)
+                            contextMenu?.items?.removeIf { it.text == "Remove" }
+                            val content = treeTableRow.item
+                            if (!empty) {
+                                if (treeTableRow.item != null) {
+                                    textFillProperty().bind(content.existsProperty.objectBinding {
+                                        if (it == true) {
+                                            Color.BLACK
+                                        } else {
+                                            Color.GRAY
+                                        }
+                                    })
+                                    if (content.exists) {
+                                        contextmenu {
+                                            item("Remove") {
+                                                action {
+                                                    content.remove()
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            column("Value") { param: TreeTableColumn.CellDataFeatures<FXMetaModel<MutableMeta>, FXMetaModel<MutableMeta>> ->
+                param.value.valueProperty()
+            }.setCellFactory {
+                ValueCell()
+            }
+
+            column("Description") { param: TreeTableColumn.CellDataFeatures<FXMetaModel<MutableMeta>, String> ->
+                (param.value.value.descriptor?.info ?: "").observable()
+            }.setCellFactory { param: TreeTableColumn<FXMetaModel<MutableMeta>, String> ->
+                val cell = TreeTableCell<FXMetaModel<MutableMeta>, String>()
+                val text = Text()
+                cell.graphic = text
+                cell.prefHeight = Control.USE_COMPUTED_SIZE
+                text.wrappingWidthProperty().bind(param.widthProperty())
+                text.textProperty().bind(cell.itemProperty())
+                cell
+            }
+        }
+    }
+
+    private fun showNodeDialog(): String? {
+        val dialog = TextInputDialog()
+        dialog.title = "Node name selection"
+        dialog.contentText = "Enter a name for new node: "
+        dialog.headerText = null
+
+        val result = dialog.showAndWait()
+        return result.orElse(null)
+    }
+
+    private fun showValueDialog(): String? {
+        val dialog = TextInputDialog()
+        dialog.title = "Value name selection"
+        dialog.contentText = "Enter a name for new value: "
+        dialog.headerText = null
+
+        val result = dialog.showAndWait()
+        return result.orElse(null)
+    }
+
+    private inner class ValueCell : TreeTableCell<FXMetaModel<MutableMeta>, FXMetaModel<MutableMeta>?>() {
+
+        public override fun updateItem(item: FXMetaModel<MutableMeta>?, empty: Boolean) {
+            if (!empty) {
+                if (item != null) {
+                    text = null
+                    val chooser = ValueChooser.build(
+                        Global,
+                        item.valueProperty,
+                        item.descriptor
+                    ) {
+                        item.setValue(it)
+                    }
+                    graphic = chooser.node
+//                    when (item) {
+//                        is FXMetaValue<MutableMeta> -> {
+//                            text = null
+//                            val chooser = ValueChooser.build(
+//                                Global,
+//                                item.valueProperty,
+//                                item.descriptor
+//                            ) {
+//                                item.set(it)
+//                            }
+//                            graphic = chooser.node
+//                        }
+//                        is FXMetaNode<MutableMeta> -> {
+//                            if (allowNew) {
+//                                text = null
+//                                graphic = HBox().apply {
+//                                    val glyph: Node = FontAwesomeIconView(FontAwesomeIcon.PLUS_CIRCLE)
+//                                    button("node", graphic = glyph) {
+//                                        hgrow = Priority.ALWAYS
+//                                        maxWidth = Double.POSITIVE_INFINITY
+//                                        action {
+//                                            showNodeDialog()?.let {
+//                                                item.addNode(it)
+//                                            }
+//                                        }
+//                                    }
+//                                    button("value", graphic = FontAwesomeIconView(FontAwesomeIcon.PLUS_SQUARE)) {
+//                                        hgrow = Priority.ALWAYS
+//                                        maxWidth = Double.POSITIVE_INFINITY
+//                                        action {
+//                                            showValueDialog()?.let {
+//                                                item.addValue(it)
+//                                            }
+//                                        }
+//                                    }
+//                                }
+//                            } else {
+//                                text = ""
+//                            }
+//                        }
+//                    }
+
+                } else {
+                    text = null
+                    graphic = null
+                }
+            } else {
+                text = null
+                graphic = null
+            }
+        }
+
+    }
+
+    public companion object {
+        /**
+         * The tag not to display node or value in MutableMetaurator
+         */
+        public const val NO_CONFIGURATOR_TAG: String = "nocfg"
+    }
+}

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/TextValueChooser.kt

@@ -10,12 +10,13 @@ import javafx.scene.control.TextField
 import javafx.scene.input.KeyCode
 import javafx.scene.input.KeyEvent
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.descriptors.validate
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.values.*
 import tornadofx.*
 
-class TextValueChooser : ValueChooserBase<TextField>() {
+public class TextValueChooser : ValueChooserBase<TextField>() {
 
     private val displayText: String
         get() = currentValue().let {
@@ -85,7 +86,7 @@ class TextValueChooser : ValueChooserBase<TextField>() {
     }
 
     private fun validate(value: Value): Boolean {
-        return descriptor?.isAllowedValue(value) ?: true
+        return descriptor?.validate(value) ?: true
     }
 
     //    @Override
@@ -101,7 +102,7 @@ class TextValueChooser : ValueChooserBase<TextField>() {
         }
     }
 
-    companion object : ValueChooser.Factory {
+    public companion object : ValueChooser.Factory {
         override val name: Name = "text".asName()
         override fun invoke(meta: Meta): ValueChooser =
             TextValueChooser()

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/ValueCallback.kt

@@ -13,11 +13,11 @@ import space.kscience.dataforge.values.Value
  * @param value Value after change
  * @param message Message on unsuccessful change
  */
-class ValueCallbackResponse(val success: Boolean, val value: Value, val message: String)
+public class ValueCallbackResponse(public val success: Boolean, public val value: Value, public val message: String)
 
 /**
  * A callback for some visual object trying to change some value
  * @author [Alexander Nozik](mailto:altavir@gmail.com)
  */
-typealias ValueCallback = (Value) -> ValueCallbackResponse
+public typealias ValueCallback = (Value) -> ValueCallbackResponse
 

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/ValueChooser.kt

@@ -10,10 +10,12 @@ import javafx.beans.value.ObservableValue
 import javafx.scene.Node
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.descriptors.ValueDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.allowedValues
+import space.kscience.dataforge.meta.descriptors.validate
 import space.kscience.dataforge.misc.Named
 import space.kscience.dataforge.misc.Type
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.provider.provideByType
 import space.kscience.dataforge.values.Null
 import space.kscience.dataforge.values.Value
@@ -42,8 +44,8 @@ public interface ValueChooser {
      *
      * @return
      */
-    public val descriptorProperty: ObjectProperty<ValueDescriptor?>
-    public var descriptor: ValueDescriptor?
+    public val descriptorProperty: ObjectProperty<MetaDescriptor?>
+    public var descriptor: MetaDescriptor?
 
     public val valueProperty: ObjectProperty<Value?>
     public var value: Value?
@@ -71,7 +73,7 @@ public interface ValueChooser {
     public companion object {
 
         private fun findWidgetByType(context: Context, type: String): Factory? {
-            return when (type.toName()) {
+            return when (Name.parse(type)) {
                 TextValueChooser.name -> TextValueChooser
                 ColorValueChooser.name -> ColorValueChooser
                 ComboBoxValueChooser.name -> ComboBoxValueChooser
@@ -79,7 +81,7 @@ public interface ValueChooser {
             }
         }
 
-        private fun build(context: Context, descriptor: ValueDescriptor?): ValueChooser {
+        private fun build(context: Context, descriptor: MetaDescriptor?): ValueChooser {
             return if (descriptor == null) {
                 TextValueChooser();
             } else {
@@ -93,7 +95,7 @@ public interface ValueChooser {
                             descriptor.widget
                         ) ?: TextValueChooser()
                     }
-                    descriptor.allowedValues.isNotEmpty() -> ComboBoxValueChooser()
+                    !descriptor.allowedValues.isNullOrEmpty() -> ComboBoxValueChooser()
                     else -> TextValueChooser()
                 }
                 chooser.descriptor = descriptor
@@ -101,10 +103,10 @@ public interface ValueChooser {
             }
         }
 
-        fun build(
+        public fun build(
             context: Context,
             value: ObservableValue<Value?>,
-            descriptor: ValueDescriptor? = null,
+            descriptor: MetaDescriptor? = null,
             setter: (Value) -> Unit,
         ): ValueChooser {
             val chooser = build(context, descriptor)
@@ -113,7 +115,7 @@ public interface ValueChooser {
                 chooser.setDisplayValue(it ?: Null)
             }
             chooser.setCallback { result ->
-                if (descriptor?.isAllowedValue(result) != false) {
+                if (descriptor?.validate(result) != false) {
                     setter(result)
                     ValueCallbackResponse(true, result, "OK")
                 } else {

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/ValueChooserBase.kt

@@ -8,7 +8,7 @@ package space.kscience.visionforge.editor
 import javafx.beans.property.SimpleObjectProperty
 import javafx.scene.Node
 import org.slf4j.LoggerFactory
-import space.kscience.dataforge.meta.descriptors.ValueDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.values.Null
 import space.kscience.dataforge.values.Value
 import tornadofx.*
@@ -18,16 +18,16 @@ import tornadofx.*
  *
  * @author Alexander Nozik
  */
-abstract class ValueChooserBase<out T : Node> : ValueChooser {
+public abstract class ValueChooserBase<out T : Node> : ValueChooser {
 
-    override val node by lazy { buildNode() }
-    final override val valueProperty = SimpleObjectProperty<Value>(Null)
-    final override val descriptorProperty = SimpleObjectProperty<ValueDescriptor>()
+    override val node: T by lazy { buildNode() }
+    final override val valueProperty: SimpleObjectProperty<Value> = SimpleObjectProperty<Value>(Null)
+    final override val descriptorProperty: SimpleObjectProperty<MetaDescriptor> = SimpleObjectProperty<MetaDescriptor>()
 
-    override var descriptor: ValueDescriptor? by descriptorProperty
+    override var descriptor: MetaDescriptor? by descriptorProperty
     override var value: Value? by valueProperty
 
-    fun resetValue() {
+    public fun resetValue() {
         setDisplayValue(currentValue())
     }
 
@@ -36,7 +36,7 @@ abstract class ValueChooserBase<out T : Node> : ValueChooser {
      * @return
      */
     protected fun currentValue(): Value {
-        return value ?: descriptor?.default ?: Null
+        return value ?: descriptor?.defaultValue ?: Null
     }
 
     /**

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/VisionEditorFragment.kt

@@ -5,39 +5,36 @@ import javafx.beans.property.SimpleObjectProperty
 import javafx.scene.Node
 import javafx.scene.Parent
 import javafx.scene.layout.VBox
-import space.kscience.dataforge.meta.Config
-import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MutableItemProvider
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.update
+import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.visionforge.*
 import tornadofx.*
 
-class VisualObjectEditorFragment(val selector: (Vision) -> Meta) : Fragment() {
+public class VisionEditorFragment(public val selector: (Vision) -> Meta) : Fragment() {
 
-    val itemProperty = SimpleObjectProperty<Vision>()
-    var item: Vision? by itemProperty
-    val descriptorProperty = SimpleObjectProperty<NodeDescriptor>()
+    public val itemProperty: SimpleObjectProperty<Vision> = SimpleObjectProperty<Vision>()
+    public var item: Vision? by itemProperty
+    public val descriptorProperty: SimpleObjectProperty<MetaDescriptor> = SimpleObjectProperty<MetaDescriptor>()
 
-    constructor(
+    public constructor(
         item: Vision?,
-        descriptor: NodeDescriptor?,
-        selector: (Vision) -> MutableItemProvider = { it.allProperties() },
+        descriptor: MetaDescriptor?,
+        selector: (Vision) -> MutableMetaProvider = { it.meta() },
     ) : this({ it.describedProperties }) {
         this.item = item
         this.descriptorProperty.set(descriptor)
     }
 
-    private var currentConfig: Config? = null
+    private var currentConfig: ObservableMutableMeta? = null
 
-    private val configProperty: Binding<Config?> = itemProperty.objectBinding { visualObject ->
-        if (visualObject == null) return@objectBinding null
-        val meta = selector(visualObject)
-        val config = Config().apply {
+    private val configProperty: Binding<ObservableMutableMeta?> = itemProperty.objectBinding { vision ->
+        if (vision == null) return@objectBinding null
+        val meta = selector(vision)
+        val config = MutableMeta {
             update(meta)
-            onChange(this@VisualObjectEditorFragment) { key, _, after ->
-                visualObject.setProperty(key, after)
         }
+        config.onChange(this@VisionEditorFragment) { key ->
+            vision.setPropertyNode(key, config[key])
         }
         //remember old config reference to cleanup listeners
         currentConfig?.removeListener(this)
@@ -47,7 +44,7 @@ class VisualObjectEditorFragment(val selector: (Vision) -> Meta) : Fragment() {
 
     private val configEditorProperty: Binding<Node?> = configProperty.objectBinding(descriptorProperty) {
         it?.let {
-            ConfigEditor(it, descriptorProperty.get()).root
+            MutableMetaEditor(it, descriptorProperty.get()).root
         }
     }
 

visionforge-fx/src/main/kotlin/space/kscience/visionforge/editor/VisionTreeFragment.kt

@@ -3,6 +3,7 @@ package space.kscience.visionforge.editor
 import javafx.beans.property.SimpleObjectProperty
 import javafx.scene.control.SelectionMode
 import javafx.scene.control.TreeItem
+import javafx.scene.layout.VBox
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.VisionGroup
 import tornadofx.*
@@ -29,13 +30,13 @@ private fun toTreeItem(vision: Vision, title: String): TreeItem<Pair<String, Vis
 }
 
 
-class VisualObjectTreeFragment : Fragment() {
-    val itemProperty = SimpleObjectProperty<Vision>()
-    var item: Vision? by itemProperty
+public class VisionTreeFragment : Fragment() {
+    public val itemProperty: SimpleObjectProperty<Vision> = SimpleObjectProperty<Vision>()
+    public var item: Vision? by itemProperty
 
-    val selectedProperty = SimpleObjectProperty<Vision>()
+    public val selectedProperty: SimpleObjectProperty<Vision> = SimpleObjectProperty<Vision>()
 
-    override val root = vbox {
+    override val root: VBox = vbox {
         titledpane("Object tree", collapsible = false) {
             treeview<Pair<String, Vision>> {
                 cellFormat {

visionforge-fx/src/main/kotlin/space/kscience/visionforge/solid/FXMaterials.kt

@@ -3,11 +3,15 @@ package space.kscience.visionforge.solid
 import javafx.scene.paint.Color
 import javafx.scene.paint.Material
 import javafx.scene.paint.PhongMaterial
-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.double
+import space.kscience.dataforge.meta.get
+import space.kscience.dataforge.meta.int
 import space.kscience.dataforge.values.ValueType
 import space.kscience.dataforge.values.int
 import space.kscience.dataforge.values.string
 import space.kscience.visionforge.Colors
+import space.kscience.visionforge.solid.FXMaterials.GREY
 
 public object FXMaterials {
     public val RED: PhongMaterial = PhongMaterial().apply {
@@ -26,46 +30,43 @@ public object FXMaterials {
     }
 
     public val BLUE: PhongMaterial = PhongMaterial(Color.BLUE)
+
 }
 
 /**
  * Infer color based on meta item
  * @param opacity default opacity
  */
-public fun MetaItem.color(opacity: Double = 1.0): Color {
-    return when (this) {
-        is MetaItemValue -> if (this.value.type == ValueType.NUMBER) {
-            val int = value.int
+public fun Meta.color(opacity: Double = 1.0): Color {
+    return value?.let {
+        if (it.type == ValueType.NUMBER) {
+            val int = it.int
             val red = int and 0x00ff0000 shr 16
             val green = int and 0x0000ff00 shr 8
             val blue = int and 0x000000ff
             Color.rgb(red, green, blue, opacity)
         } else {
-            Color.web(this.value.string)
+            Color.web(it.string)
         }
-        is MetaItemNode -> {
-            Color.rgb(
-                node[Colors.RED_KEY]?.int ?: 0,
-                node[Colors.GREEN_KEY]?.int ?: 0,
-                node[Colors.BLUE_KEY]?.int ?: 0,
-                node[SolidMaterial.OPACITY_KEY]?.double ?: opacity
+    } ?: Color.rgb(
+        this[Colors.RED_KEY]?.int ?: 0,
+        this[Colors.GREEN_KEY]?.int ?: 0,
+        this[Colors.BLUE_KEY]?.int ?: 0,
+        this[SolidMaterial.OPACITY_KEY]?.double ?: opacity
     )
 }
-    }
-}
 
 /**
  * Infer FX material based on meta item
  */
-public fun MetaItem?.material(): Material {
-    return when (this) {
-        null -> FXMaterials.GREY
-        is MetaItemValue -> PhongMaterial(color())
-        is MetaItemNode -> PhongMaterial().apply {
-            val opacity = node[SolidMaterial.OPACITY_KEY].double ?: 1.0
-            diffuseColor = node[SolidMaterial.COLOR_KEY]?.color(opacity) ?: Color.DARKGREY
-            specularColor = node[SolidMaterial.SPECULAR_COLOR_KEY]?.color(opacity) ?: Color.WHITE
-        }
+public fun Meta?.material(): Material {
+    if (this == null) return GREY
+    return value?.let {
+        PhongMaterial(color())
+    } ?: PhongMaterial().apply {
+        val opacity = get(SolidMaterial.OPACITY_KEY).double ?: 1.0
+        diffuseColor = get(SolidMaterial.COLOR_KEY)?.color(opacity) ?: Color.DARKGREY
+        specularColor = get(SolidMaterial.SPECULAR_COLOR_KEY)?.color(opacity) ?: Color.WHITE
     }
 }
 

visionforge-fx/src/main/kotlin/space/kscience/visionforge/solid/FXReferenceFactory.kt

@@ -2,7 +2,10 @@ package space.kscience.visionforge.solid
 
 import javafx.scene.Group
 import javafx.scene.Node
-import space.kscience.dataforge.names.*
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.cutFirst
+import space.kscience.dataforge.names.firstOrNull
+import space.kscience.dataforge.names.isEmpty
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.onPropertyChange
 import kotlin.reflect.KClass
@@ -16,7 +19,7 @@ class FXReferenceFactory(val plugin: FX3DPlugin) : FX3DFactory<SolidReferenceGro
 
         obj.onPropertyChange(plugin.context) { name->
             if (name.firstOrNull()?.body == SolidReferenceGroup.REFERENCE_CHILD_PROPERTY_PREFIX) {
-                val childName = name.firstOrNull()?.index?.toName() ?: error("Wrong syntax for reference child property: '$name'")
+                val childName = name.firstOrNull()?.index?.let(Name::parse) ?: error("Wrong syntax for reference child property: '$name'")
                 val propertyName = name.cutFirst()
                 val referenceChild = obj[childName] ?: error("Reference child with name '$childName' not found")
                 val child = node.findChild(childName) ?: error("Object child with name '$childName' not found")

visionforge-fx/src/main/kotlin/space/kscience/visionforge/solid/VisualObjectFXBinding.kt

@@ -5,7 +5,6 @@ import javafx.beans.binding.*
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.startsWith
-import space.kscience.dataforge.names.toName
 import space.kscience.dataforge.values.Value
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.onPropertyChange
@@ -15,7 +14,7 @@ import tornadofx.*
  * A caching binding collection for [Vision] properties
  */
 public class VisualObjectFXBinding(public val fx: FX3DPlugin, public val obj: Vision) {
-    private val bindings = HashMap<Name, ObjectBinding<MetaItem?>>()
+    private val bindings = HashMap<Name, ObjectBinding<Meta?>>()
 
     init {
         obj.onPropertyChange(fx.context) { name ->
@@ -33,30 +32,29 @@ public class VisualObjectFXBinding(public val fx: FX3DPlugin, public val obj: Vi
         }
     }
 
-    public operator fun get(key: Name): ObjectBinding<MetaItem?> {
+    public operator fun get(key: Name): ObjectBinding<Meta?> {
         return bindings.getOrPut(key) {
-            object : ObjectBinding<MetaItem?>() {
-                override fun computeValue(): MetaItem? = obj.getProperty(key)
+            object : ObjectBinding<Meta?>() {
+                override fun computeValue(): Meta? = obj.getProperty(key)
             }
         }
     }
 
-    public operator fun get(key: String) = get(key.toName())
+    public operator fun get(key: String): ObjectBinding<Meta?> = get(Name.parse(key))
 }
 
-public fun ObjectBinding<MetaItem?>.value(): Binding<Value?> = objectBinding { it.value }
-public fun ObjectBinding<MetaItem?>.string(): StringBinding = stringBinding { it.string }
-public fun ObjectBinding<MetaItem?>.number(): Binding<Number?> = objectBinding { it.number }
-public fun ObjectBinding<MetaItem?>.double(): Binding<Double?> = objectBinding { it.double }
-public fun ObjectBinding<MetaItem?>.float(): Binding<Float?> = objectBinding { it.float }
-public fun ObjectBinding<MetaItem?>.int(): Binding<Int?> = objectBinding { it.int }
-public fun ObjectBinding<MetaItem?>.long(): Binding<Long?> = objectBinding { it.long }
-public fun ObjectBinding<MetaItem?>.node(): Binding<Meta?> = objectBinding { it.node }
+public fun ObjectBinding<Meta?>.value(): Binding<Value?> = objectBinding { it?.value }
+public fun ObjectBinding<Meta?>.string(): StringBinding = stringBinding { it.string }
+public fun ObjectBinding<Meta?>.number(): Binding<Number?> = objectBinding { it.number }
+public fun ObjectBinding<Meta?>.double(): Binding<Double?> = objectBinding { it.double }
+public fun ObjectBinding<Meta?>.float(): Binding<Float?> = objectBinding { it.float }
+public fun ObjectBinding<Meta?>.int(): Binding<Int?> = objectBinding { it.int }
+public fun ObjectBinding<Meta?>.long(): Binding<Long?> = objectBinding { it.long }
 
-public fun ObjectBinding<MetaItem?>.string(default: String): StringBinding = stringBinding { it.string ?: default }
-public fun ObjectBinding<MetaItem?>.double(default: Double): DoubleBinding = doubleBinding { it.double ?: default }
-public fun ObjectBinding<MetaItem?>.float(default: Float): FloatBinding = floatBinding { it.float ?: default }
-public fun ObjectBinding<MetaItem?>.int(default: Int): IntegerBinding = integerBinding { it.int ?: default }
-public fun ObjectBinding<MetaItem?>.long(default: Long): LongBinding = longBinding { it.long ?: default }
+public fun ObjectBinding<Meta?>.string(default: String): StringBinding = stringBinding { it.string ?: default }
+public fun ObjectBinding<Meta?>.double(default: Double): DoubleBinding = doubleBinding { it.double ?: default }
+public fun ObjectBinding<Meta?>.float(default: Float): FloatBinding = floatBinding { it.float ?: default }
+public fun ObjectBinding<Meta?>.int(default: Int): IntegerBinding = integerBinding { it.int ?: default }
+public fun ObjectBinding<Meta?>.long(default: Long): LongBinding = longBinding { it.long ?: default }
 
-public fun <T> ObjectBinding<MetaItem?>.transform(transform: (MetaItem) -> T): Binding<T?> = objectBinding { it?.let(transform) }
+public fun <T> ObjectBinding<Meta?>.transform(transform: (Meta) -> T): Binding<T?> = objectBinding { it?.let(transform) }

visionforge-gdml/src/commonMain/kotlin/space/kscience/visionforge/gdml/GdmlTransformer.kt

@@ -1,12 +1,12 @@
 package space.kscience.visionforge.gdml
 
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MetaBuilder
+import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
-import space.kscience.dataforge.names.toName
+
 import space.kscience.gdml.*
 import space.kscience.visionforge.*
 import space.kscience.visionforge.html.VisionOutput
@@ -41,8 +41,8 @@ public class GdmlTransformer {
 
     internal val styleCache = HashMap<Name, Meta>()
 
-    public fun Solid.registerAndUseStyle(name: String, builder: MetaBuilder.() -> Unit) {
-        styleCache.getOrPut(name.toName()) {
+    public fun Solid.registerAndUseStyle(name: String, builder: MutableMeta.() -> Unit) {
+        styleCache.getOrPut(Name.parse(name)) {
             Meta(builder)
         }
         useStyle(name)
@@ -118,7 +118,7 @@ private class GdmlTransformerEnv(val settings: GdmlTransformer) {
     private val proto = SolidGroup()
 
     private val solids = proto.group(solidsName) {
-        setProperty("edges.enabled", false)
+        setPropertyNode("edges.enabled", false)
     }
 
     private val referenceStore = HashMap<Name, MutableList<SolidReferenceGroup>>()

visionforge-gdml/src/commonTest/kotlin/TestCubes.kt

@@ -1,7 +1,7 @@
 package space.kscience.visionforge.gdml
 
 import space.kscience.dataforge.context.Context
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.Name
 import space.kscience.gdml.*
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.get
@@ -23,7 +23,7 @@ class TestCubes {
     fun testCubesDirect() {
         val vision = cubes.toVision()
 //        println(Solids.encodeToString(vision))
-        val smallBoxPrototype = vision.getPrototype("solids.smallBox".toName()) as? Box
+        val smallBoxPrototype = vision.getPrototype(Name.parse("solids.smallBox")) as? Box
         assertNotNull(smallBoxPrototype)
         assertEquals(30.0, smallBoxPrototype.xSize.toDouble())
         val smallBoxVision = vision["composite-111.smallBox"]?.unref as? Box
@@ -46,7 +46,7 @@ class TestCubes {
         val vision = cubes.toVision()
         val serialized = Solids.encodeToString(vision)
         val deserialized = testContext.visionManager.decodeFromString(serialized) as SolidGroup
-        val smallBox = deserialized.getPrototype("solids.smallBox".toName()) as? Box
+        val smallBox = deserialized.getPrototype(Name.parse("solids.smallBox")) as? Box
         assertNotNull(smallBox)
         assertEquals(30.0, smallBox.xSize.toDouble())
         //println(testContext.visionManager.encodeToString(deserialized))

visionforge-gdml/src/jvmTest/kotlin/space/kscience/visionforge/gdml/TestConvertor.kt

@@ -1,7 +1,7 @@
 package space.kscience.visionforge.gdml
 
 import org.junit.jupiter.api.Test
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.Name
 import space.kscience.gdml.Gdml
 import space.kscience.gdml.decodeFromStream
 import space.kscience.visionforge.solid.Solids
@@ -23,7 +23,7 @@ class TestConvertor {
         val stream = javaClass.getResourceAsStream("/gdml/cubes.gdml")!!
         val gdml = Gdml.decodeFromStream(stream)
         val vision = gdml.toVision()
-        assertNotNull(vision.getPrototype("solids.box".toName()))
+        assertNotNull(vision.getPrototype(Name.parse("solids.box")))
         println(Solids.encodeToString(vision))
     }
 

visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/VisionOfMarkup.kt

@@ -7,7 +7,7 @@ import kotlinx.serialization.modules.polymorphic
 import kotlinx.serialization.modules.subclass
 import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.asName
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.VisionBase
 import space.kscience.visionforge.setProperty
@@ -27,7 +27,7 @@ public class VisionOfMarkup(
         }
 
     public companion object {
-        public val CONTENT_PROPERTY_KEY: Name = "content".toName()
+        public val CONTENT_PROPERTY_KEY: Name = "content".asName()
         public const val COMMONMARK_FORMAT: String = "markdown.commonmark"
         public const val GFM_FORMAT: String = "markdown.gfm"
     }

visionforge-plotly/build.gradle.kts

@@ -2,7 +2,7 @@ plugins {
     id("ru.mipt.npm.gradle.mpp")
 }
 
-val plotlyVersion = "0.4.3"
+val plotlyVersion = "0.5.0-dev-1"
 
 kscience {
     useSerialization()

visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt

@@ -2,6 +2,8 @@ package space.kscience.visionforge.plotly
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
+import space.kscience.dataforge.meta.MutableMeta
+import space.kscience.dataforge.meta.asObservable
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.plotly.Plot
 import space.kscience.plotly.Plotly
@@ -13,10 +15,10 @@ import space.kscience.visionforge.root
 @SerialName("vision.plotly")
 public class VisionOfPlotly private constructor() : VisionBase() {
     public constructor(plot: Plot) : this() {
-        properties = plot.config
+        properties = plot.meta
     }
 
-    public val plot: Plot get() = Plot(properties ?: Config())
+    public val plot: Plot get() = Plot(properties?.asObservable() ?: MutableMeta())
 }
 
 public fun Plot.asVision(): VisionOfPlotly = VisionOfPlotly(this)

visionforge-plotly/src/jsMain/kotlin/space/kscience/visionforge/plotly/plotlyJs.kt

@@ -31,7 +31,7 @@ public actual class PlotlyPlugin : VisionPlugin(), ElementVisionRenderer {
     override fun render(element: Element, vision: Vision, meta: Meta) {
         val plot = (vision as? VisionOfPlotly)?.plot ?: error("VisionOfPlotly expected but ${vision::class} found")
         val config = PlotlyConfig.read(meta)
-        println(plot.config)
+        println(plot.meta)
         println(plot.data[0].toMeta())
         element.plot(plot, config)
     }

visionforge-server/src/main/kotlin/space/kscience/visionforge/three/server/VisionServer.kt

@@ -30,7 +30,6 @@ import space.kscience.dataforge.context.fetch
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.VisionChange
 import space.kscience.visionforge.VisionManager
@@ -54,12 +53,12 @@ public class VisionServer internal constructor(
     private val application: Application,
     private val rootRoute: String,
 ) : Configurable, CoroutineScope by application {
-    override val config: ObservableMeta = ObservableMeta()
-    public var updateInterval: Long by config.long(300, key = UPDATE_INTERVAL_KEY)
-    public var cacheFragments: Boolean by config.boolean(true)
-    public var dataEmbed: Boolean by config.boolean(true, "data.embed".toName())
-    public var dataFetch: Boolean by config.boolean(false, "data.fetch".toName())
-    public var dataConnect: Boolean by config.boolean(true, "data.connect".toName())
+    override val meta: ObservableMutableMeta = MutableMeta()
+    public var updateInterval: Long by meta.long(300, key = UPDATE_INTERVAL_KEY)
+    public var cacheFragments: Boolean by meta.boolean(true)
+    public var dataEmbed: Boolean by meta.boolean(true, Name.parse("data.embed"))
+    public var dataFetch: Boolean by meta.boolean(false, Name.parse("data.fetch"))
+    public var dataConnect: Boolean by meta.boolean(true, Name.parse("data.connect"))
 
     /**
      * a list of headers that should be applied to all pages
@@ -131,14 +130,14 @@ public class VisionServer internal constructor(
                 ?: error("Vision name is not defined in parameters")
 
             application.log.debug("Opened server socket for $name")
-            val vision: Vision = visions[name.toName()] ?: error("Plot with id='$name' not registered")
+            val vision: Vision = visions[Name.parse(name)] ?: error("Plot with id='$name' not registered")
 
             launch {
                 incoming.consumeEach {
                     val change = visionManager.jsonFormat.decodeFromString(
                         VisionChange.serializer(), it.data.decodeToString()
                     )
-                    vision.update(change)
+                    vision.change(change)
                 }
             }
 
@@ -161,7 +160,7 @@ public class VisionServer internal constructor(
             val name: String = call.request.queryParameters["name"]
                 ?: error("Vision name is not defined in parameters")
 
-            val vision: Vision? = visions[name.toName()]
+            val vision: Vision? = visions[Name.parse(name)]
             if (vision == null) {
                 call.respond(HttpStatusCode.NotFound, "Vision with name '$name' not found")
             } else {
@@ -232,7 +231,7 @@ public class VisionServer internal constructor(
 
     public companion object {
         public const val DEFAULT_PAGE: String = "/"
-        public val UPDATE_INTERVAL_KEY: Name = "update.interval".toName()
+        public val UPDATE_INTERVAL_KEY: Name = Name.parse("update.interval")
     }
 }
 

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ColorAccessor.kt

@@ -1,8 +1,6 @@
 package space.kscience.visionforge.solid
 
-import space.kscience.dataforge.meta.MutableItemProvider
-import space.kscience.dataforge.meta.set
-import space.kscience.dataforge.meta.value
+import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.values.Value
 import space.kscience.dataforge.values.asValue
@@ -11,11 +9,17 @@ import space.kscience.visionforge.Colors
 import space.kscience.visionforge.VisionBuilder
 
 @VisionBuilder
-public class ColorAccessor(private val parent: MutableItemProvider, private val colorKey: Name) {
+public class ColorAccessor(private val parent: MutableMetaProvider, private val colorKey: Name) {
     public var value: Value?
-        get() = parent.getItem(colorKey).value
+        get() = parent.getMeta(colorKey)?.value
         set(value) {
-            parent[colorKey] = value
+            parent.setValue(colorKey,value)
+        }
+
+    public var item: Meta?
+        get() = parent.getMeta(colorKey)
+        set(value) {
+            parent.setMeta(colorKey,value)
         }
 }
 

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Composite.kt

@@ -31,7 +31,7 @@ public inline fun VisionContainerBuilder<Solid>.composite(
     if (children.size != 2) error("Composite requires exactly two children")
     return Composite(type, children[0], children[1]).also { composite ->
         composite.configure {
-            update(group.meta)
+            update(group.meta())
         }
         if (group.position != null) {
             composite.position = group.position

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt

@@ -2,7 +2,8 @@ package space.kscience.visionforge.solid
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.meta.ObservableMeta
+import space.kscience.dataforge.meta.MutableMeta
+import space.kscience.dataforge.meta.ObservableMutableMeta
 import space.kscience.visionforge.*
 import kotlin.math.PI
 import kotlin.math.cos
@@ -95,7 +96,7 @@ public class Extruded(
 public class ExtrudeBuilder(
     public var shape: List<Point2D> = emptyList(),
     public var layers: ArrayList<Layer> = ArrayList(),
-    config: ObservableMeta = ObservableMeta()
+    config: ObservableMutableMeta = MutableMeta()
 ) : SimpleVisionPropertyContainer<Extruded>(config) {
     public fun shape(block: Shape2DBuilder.() -> Unit) {
         this.shape = Shape2DBuilder().apply(block).build()
@@ -105,7 +106,7 @@ public class ExtrudeBuilder(
         layers.add(Layer(x.toFloat(), y.toFloat(), z.toFloat(), scale.toFloat()))
     }
 
-    internal fun build(): Extruded = Extruded(shape, layers).apply { configure(config) }
+    internal fun build(): Extruded = Extruded(shape, layers).apply { configure(meta()) }
 }
 
 @VisionBuilder

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/PolyLine.kt

@@ -2,13 +2,12 @@ package space.kscience.visionforge.solid
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.meta.number
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
 import space.kscience.visionforge.VisionBuilder
 import space.kscience.visionforge.VisionContainerBuilder
-import space.kscience.visionforge.allProperties
+import space.kscience.visionforge.numberProperty
 import space.kscience.visionforge.set
 
 @Serializable
@@ -16,8 +15,8 @@ import space.kscience.visionforge.set
 public class PolyLine(public val points: List<Point3D>) : SolidBase(), Solid {
 
     //var lineType by string()
-    public var thickness: Number by allProperties(inherit = false).number(1.0,
-        key = SolidMaterial.MATERIAL_KEY + THICKNESS_KEY)
+    public var thickness: Number by numberProperty(name = SolidMaterial.MATERIAL_KEY + THICKNESS_KEY) { 1.0 }
+
 
     public companion object {
         public val THICKNESS_KEY: Name = "thickness".asName()

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solid.kt

@@ -1,7 +1,7 @@
 package space.kscience.visionforge.solid
 
 import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.descriptors.*
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
@@ -35,7 +35,7 @@ import kotlin.reflect.KProperty
  */
 public interface Solid : Vision {
 
-    override val descriptor: NodeDescriptor get() = Companion.descriptor
+    override val descriptor: MetaDescriptor get() = Companion.descriptor
 
     public companion object {
         //        val SELECTED_KEY = "selected".asName()
@@ -69,17 +69,15 @@ public interface Solid : Vision {
         public val Y_SCALE_KEY: Name = SCALE_KEY + Y_KEY
         public val Z_SCALE_KEY: Name = SCALE_KEY + Z_KEY
 
-        public val descriptor: NodeDescriptor by lazy {
-            NodeDescriptor {
-                value(VISIBLE_KEY) {
+        public val descriptor: MetaDescriptor by lazy {
+            MetaDescriptor {
+                value(VISIBLE_KEY, ValueType.BOOLEAN) {
                     inherited = false
-                    type(ValueType.BOOLEAN)
                     default(true)
                 }
 
                 //TODO replace by descriptor merge
-                value(Vision.STYLE_KEY) {
-                    type(ValueType.STRING)
+                value(Vision.STYLE_KEY, ValueType.STRING) {
                     multiple = true
                     hide()
                 }
@@ -96,12 +94,13 @@ public interface Solid : Vision {
                     hide()
                 }
 
-                value(DETAIL_KEY) {
-                    type(ValueType.NUMBER)
+                value(DETAIL_KEY, ValueType.NUMBER) {
                     hide()
                 }
 
-                item(SolidMaterial.MATERIAL_KEY.toString(), SolidMaterial.descriptor)
+                item(SolidMaterial.MATERIAL_KEY.toString(), SolidMaterial){
+                    valueRequirement = ValueRequirement.ABSENT
+                }
 
                 enum(ROTATION_ORDER_KEY, default = RotationOrder.XYZ) {
                     hide()
@@ -115,7 +114,7 @@ public interface Solid : Vision {
  * Get the layer number this solid belongs to. Return 0 if layer is not defined.
  */
 public var Solid.layer: Int
-    get() = allProperties().getItem(LAYER_KEY).int ?: 0
+    get() = getProperty(LAYER_KEY, inherit = true).int ?: 0
     set(value) {
         setProperty(LAYER_KEY, value)
     }
@@ -136,7 +135,7 @@ public enum class RotationOrder {
  */
 public var Solid.rotationOrder: RotationOrder
     get() = getProperty(Solid.ROTATION_ORDER_KEY).enum<RotationOrder>() ?: RotationOrder.XYZ
-    set(value) = setProperty(Solid.ROTATION_ORDER_KEY, value.name.asValue())
+    set(value) = setPropertyValue(Solid.ROTATION_ORDER_KEY, value.name.asValue())
 
 
 /**
@@ -144,7 +143,7 @@ public var Solid.rotationOrder: RotationOrder
  */
 public var Solid.detail: Int?
     get() = getProperty(DETAIL_KEY, false).int
-    set(value) = setProperty(DETAIL_KEY, value?.asValue())
+    set(value) = setPropertyValue(DETAIL_KEY, value?.asValue())
 
 /**
  * If this property is true, the object will be ignored on render.
@@ -152,7 +151,7 @@ public var Solid.detail: Int?
  */
 public var Vision.ignore: Boolean?
     get() = getProperty(IGNORE_KEY, false).boolean
-    set(value) = setProperty(IGNORE_KEY, value?.asValue())
+    set(value) = setPropertyValue(IGNORE_KEY, value?.asValue())
 
 //var VisualObject.selected: Boolean?
 //    get() = getProperty(SELECTED_KEY).boolean
@@ -182,7 +181,7 @@ internal fun point(name: Name, default: Float): ReadWriteProperty<Solid, Point3D
 
         override fun setValue(thisRef: Solid, property: KProperty<*>, value: Point3D?) {
             if (value == null) {
-                thisRef.setProperty(name, null)
+                thisRef.setPropertyNode(name, null)
             } else {
                 thisRef.setProperty(name + X_KEY, value.x)
                 thisRef.setProperty(name + Y_KEY, value.y)

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidBase.kt

@@ -2,17 +2,17 @@ package space.kscience.visionforge.solid
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.visionforge.VisionBase
 import space.kscience.visionforge.VisionChange
 
 @Serializable
 @SerialName("solid")
 public open class SolidBase : VisionBase(), Solid {
-    override val descriptor: NodeDescriptor get() = Solid.descriptor
+    override val descriptor: MetaDescriptor get() = Solid.descriptor
 
-    override fun update(change: VisionChange) {
+    override fun change(change: VisionChange) {
         updatePosition(change.properties)
-        super.update(change)
+        super.change(change)
     }
 }

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidGroup.kt

@@ -2,7 +2,7 @@ package space.kscience.visionforge.solid
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.NameToken
 import space.kscience.visionforge.*
@@ -40,7 +40,7 @@ public class SolidGroup : VisionGroupBase(), Solid, PrototypeHolder {
         }
 
 
-    override val descriptor: NodeDescriptor get() = Solid.descriptor
+    override val descriptor: MetaDescriptor get() = Solid.descriptor
 
     /**
      * Get a prototype redirecting the request to the parent if prototype is not found.
@@ -60,9 +60,9 @@ public class SolidGroup : VisionGroupBase(), Solid, PrototypeHolder {
 
     override fun createGroup(): SolidGroup = SolidGroup()
 
-    override fun update(change: VisionChange) {
+    override fun change(change: VisionChange) {
         updatePosition(change.properties)
-        super.update(change)
+        super.change(change)
     }
 
     public companion object {

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidMaterial.kt

@@ -1,8 +1,8 @@
 package space.kscience.visionforge.solid
 
 import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.descriptors.attributes
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.value
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
@@ -26,6 +26,8 @@ public class SolidMaterial : Scheme() {
      */
     public val specularColor: ColorAccessor = ColorAccessor(this, SPECULAR_COLOR_KEY)
 
+    public val emissiveColor: ColorAccessor = ColorAccessor(this, "emissiveColor".asName())
+
     /**
      * Opacity
      */
@@ -48,43 +50,37 @@ public class SolidMaterial : Scheme() {
         public val WIREFRAME_KEY: Name = "wireframe".asName()
         public val MATERIAL_WIREFRAME_KEY: Name = MATERIAL_KEY + WIREFRAME_KEY
 
-        public override val descriptor: NodeDescriptor by lazy {
+        public override val descriptor: MetaDescriptor by lazy {
             //must be lazy to avoid initialization bug
-            NodeDescriptor {
+            MetaDescriptor {
                 inherited = true
                 usesStyles = true
 
-                value(COLOR_KEY) {
+                value(COLOR_KEY, ValueType.STRING, ValueType.NUMBER) {
                     inherited = true
                     usesStyles = true
-                    type(ValueType.STRING, ValueType.NUMBER)
                     widgetType = "color"
                 }
 
-                value(SPECULAR_COLOR_KEY) {
+                value(SPECULAR_COLOR_KEY, ValueType.STRING, ValueType.NUMBER) {
                     inherited = true
                     usesStyles = true
-                    type(ValueType.STRING, ValueType.NUMBER)
                     widgetType = "color"
                     hide()
                 }
 
-                value(OPACITY_KEY) {
+                value(OPACITY_KEY, ValueType.NUMBER) {
                     inherited = true
                     usesStyles = true
-                    type(ValueType.NUMBER)
                     default(1.0)
-                    attributes {
-                        this["min"] = 0.0
-                        this["max"] = 1.0
-                        this["step"] = 0.1
-                    }
+                    attributes["min"] = 0.0
+                    attributes["max"] = 1.0
+                    attributes["step"] = 0.1
                     widgetType = "slider"
                 }
-                value(WIREFRAME_KEY) {
+                value(WIREFRAME_KEY, ValueType.BOOLEAN) {
                     inherited = true
                     usesStyles = true
-                    type(ValueType.BOOLEAN)
                     default(false)
                 }
             }
@@ -94,21 +90,23 @@ public class SolidMaterial : Scheme() {
 
 public val Solid.color: ColorAccessor
     get() = ColorAccessor(
-        allProperties(inherit = true),
+        meta(inherit = true),
         MATERIAL_COLOR_KEY
     )
 
 public var Solid.material: SolidMaterial?
-    get() = getProperty(MATERIAL_KEY, inherit = true).node?.let { SolidMaterial.read(it) }
-    set(value) = setProperty(MATERIAL_KEY, value?.rootNode)
+    get() = getProperty(MATERIAL_KEY, inherit = true)?.let { SolidMaterial.read(it) }
+    set(value) = setPropertyNode(MATERIAL_KEY, value?.meta)
 
 @VisionBuilder
 public fun Solid.material(builder: SolidMaterial.() -> Unit) {
-    ownProperties.getChild(MATERIAL_KEY).update(SolidMaterial, builder)
+    configure(MATERIAL_KEY){
+        updateWith(SolidMaterial,builder)
+    }
 }
 
 public var Solid.opacity: Number?
     get() = getProperty(MATERIAL_OPACITY_KEY, inherit = true).number
     set(value) {
-        setProperty(MATERIAL_OPACITY_KEY, value?.asValue())
+        setPropertyValue(MATERIAL_OPACITY_KEY, value?.asValue())
     }

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt

@@ -4,11 +4,11 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.mapNotNull
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.meta.MetaItem
-import space.kscience.dataforge.meta.asMetaItem
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.*
+import space.kscience.dataforge.values.Value
 import space.kscience.visionforge.*
 
 
@@ -37,7 +37,7 @@ private fun SolidReference.getRefProperty(
     inherit: Boolean,
     includeStyles: Boolean,
     includeDefaults: Boolean,
-): MetaItem? = if (!inherit && !includeStyles && !includeDefaults) {
+): Meta? = if (!inherit && !includeStyles && !includeDefaults) {
     getOwnProperty(name)
 } else {
     buildList {
@@ -88,9 +88,9 @@ public class SolidReferenceGroup(
         inherit: Boolean,
         includeStyles: Boolean,
         includeDefaults: Boolean,
-    ): MetaItem? = getRefProperty(name, inherit, includeStyles, includeDefaults)
+    ): Meta? = getRefProperty(name, inherit, includeStyles, includeDefaults)
 
-    override val descriptor: NodeDescriptor get() = prototype.descriptor
+    override val descriptor: MetaDescriptor get() = prototype.descriptor
 
 
     /**
@@ -118,11 +118,15 @@ public class SolidReferenceGroup(
                     ReferenceChild(owner, refName + key.asName())
                 } ?: emptyMap()
 
-        override fun getOwnProperty(name: Name): MetaItem? =
+        override fun getOwnProperty(name: Name): Meta? =
             owner.getOwnProperty(childPropertyName(refName, name))
 
-        override fun setProperty(name: Name, item: MetaItem?, notify: Boolean) {
-            owner.setProperty(childPropertyName(refName, name), item, notify)
+        override fun setPropertyNode(name: Name, node: Meta?, notify: Boolean) {
+            owner.setPropertyNode(childPropertyName(refName, name), node, notify)
+        }
+
+        override fun setPropertyValue(name: Name, value: Value?, notify: Boolean) {
+            owner.setPropertyValue(childPropertyName(refName, name), value, notify)
         }
 
         override fun getProperty(
@@ -130,7 +134,7 @@ public class SolidReferenceGroup(
             inherit: Boolean,
             includeStyles: Boolean,
             includeDefaults: Boolean,
-        ): MetaItem? = getRefProperty(name, inherit, includeStyles, includeDefaults)
+        ): Meta? = getRefProperty(name, inherit, includeStyles, includeDefaults)
 
         override var parent: VisionGroup?
             get() {
@@ -155,13 +159,13 @@ public class SolidReferenceGroup(
             owner.invalidateProperty(childPropertyName(refName, propertyName))
         }
 
-        override fun update(change: VisionChange) {
+        override fun change(change: VisionChange) {
             change.properties?.let {
-                updateProperties(Name.EMPTY, it.asMetaItem())
+                updateProperties(Name.EMPTY, it)
             }
         }
 
-        override val descriptor: NodeDescriptor get() = prototype.descriptor
+        override val descriptor: MetaDescriptor get() = prototype.descriptor
 
     }
 
@@ -184,7 +188,7 @@ public fun SolidGroup.ref(
 public fun SolidGroup.ref(
     name: String,
     obj: Solid,
-    templateName: Name = name.toName(),
+    templateName: Name = Name.parse(name),
 ): SolidReferenceGroup {
     val existing = getPrototype(templateName)
     if (existing == null) {

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/geometry.kt

@@ -95,13 +95,13 @@ public fun MutablePoint3D.normalizeInPlace() {
     z /= norm
 }
 
-internal fun ItemProvider.point3D(default: Float = 0f) = object : Point3D {
+internal fun MetaProvider.point3D(default: Float = 0f) = object : Point3D {
     override val x: Float by float(default)
     override val y: Float by float(default)
     override val z: Float by float(default)
 }
 
-public fun Point3D.toMeta(): MetaBuilder = Meta {
+public fun Point3D.toMeta(): Meta = Meta {
     X_KEY put x
     Y_KEY put y
     Z_KEY put z
@@ -115,7 +115,7 @@ internal fun Meta.toVector(default: Float = 0f) = Point3D(
 )
 
 internal fun Solid.updatePosition(meta: Meta?) {
-    meta[Solid.POSITION_KEY].node?.toVector()?.let { position = it }
-    meta[Solid.ROTATION_KEY].node?.toVector()?.let { rotation = it }
-    meta[Solid.SCALE_KEY].node?.toVector(1f)?.let { scale = it }
+    meta?.get(Solid.POSITION_KEY)?.toVector()?.let { position = it }
+    meta?.get(Solid.ROTATION_KEY)?.toVector()?.let { rotation = it }
+    meta?.get(Solid.SCALE_KEY)?.toVector(1f)?.let { scale = it }
 }

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/specifications/Axes.kt

@@ -3,7 +3,7 @@ package space.kscience.visionforge.solid.specifications
 import space.kscience.dataforge.meta.Scheme
 import space.kscience.dataforge.meta.SchemeSpec
 import space.kscience.dataforge.meta.boolean
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.double
 import space.kscience.visionforge.value
 
@@ -16,8 +16,8 @@ public class Axes : Scheme() {
         public const val AXIS_SIZE: Double = 1000.0
         public const val AXIS_WIDTH: Double = 3.0
 
-        override val descriptor: NodeDescriptor by lazy {
-            NodeDescriptor {
+        override val descriptor: MetaDescriptor by lazy {
+            MetaDescriptor {
                 value(Axes::visible){
                     default(false)
                 }

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/specifications/Camera.kt

@@ -2,7 +2,7 @@ package space.kscience.visionforge.solid.specifications
 
 import space.kscience.dataforge.meta.Scheme
 import space.kscience.dataforge.meta.SchemeSpec
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.double
 import space.kscience.dataforge.meta.int
 import space.kscience.visionforge.value
@@ -27,8 +27,8 @@ public class Camera : Scheme() {
         public const val FAR_CLIP: Double = 10000.0
         public const val FIELD_OF_VIEW: Int = 75
 
-        override val descriptor: NodeDescriptor  by lazy {
-            NodeDescriptor {
+        override val descriptor: MetaDescriptor  by lazy {
+            MetaDescriptor {
                 value(Camera::fov){
                     default(FIELD_OF_VIEW)
                 }

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/specifications/Canvas3DOptions.kt

@@ -1,8 +1,7 @@
 package space.kscience.visionforge.solid.specifications
 
 import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.NodeDescriptor
-import space.kscience.dataforge.meta.descriptors.attributes
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.values.ValueType
 import space.kscience.visionforge.hide
@@ -16,30 +15,26 @@ public class Clipping : Scheme() {
     public var z: Double? by double()
 
     public companion object : SchemeSpec<Clipping>(::Clipping) {
-        override val descriptor: NodeDescriptor = NodeDescriptor {
+        override val descriptor: MetaDescriptor = MetaDescriptor {
             value(Clipping::x) {
                 widgetType = "range"
-                attributes {
-                    set("min", 0.0)
-                    set("max", 1.0)
-                    set("step", 0.01)
-                }
+                attributes["min"] = 0.0
+                attributes["max"] = 1.0
+                attributes["step"] = 0.01
             }
             value(Clipping::y) {
                 widgetType = "range"
-                attributes {
-                    set("min", 0.0)
-                    set("max", 1.0)
-                    set("step", 0.01)
-                }
+                attributes["min"] = 0.0
+                attributes["max"] = 1.0
+                attributes["step"] = 0.01
+
             }
             value(Clipping::z) {
                 widgetType = "range"
-                attributes {
-                    set("min", 0.0)
-                    set("max", 1.0)
-                    set("step", 0.01)
-                }
+                attributes["min"] = 0.0
+                attributes["max"] = 1.0
+                attributes["step"] = 0.01
+
             }
         }
     }
@@ -55,7 +50,7 @@ public class CanvasSize : Scheme() {
     public var maxHeight: Number by number { maxSize }
 
     public companion object : SchemeSpec<CanvasSize>(::CanvasSize) {
-        override val descriptor: NodeDescriptor = NodeDescriptor {
+        override val descriptor: MetaDescriptor = MetaDescriptor {
             value(CanvasSize::minSize)
             value(CanvasSize::minWith)
             value(CanvasSize::minHeight)
@@ -82,8 +77,8 @@ public class Canvas3DOptions : Scheme() {
 
 
     public companion object : SchemeSpec<Canvas3DOptions>(::Canvas3DOptions) {
-        override val descriptor: NodeDescriptor by lazy {
-            NodeDescriptor {
+        override val descriptor: MetaDescriptor by lazy {
+            MetaDescriptor {
                 scheme(Canvas3DOptions::axes, Axes)
                 scheme(Canvas3DOptions::light, Light)
 
@@ -104,7 +99,7 @@ public class Canvas3DOptions : Scheme() {
                     multiple = true
                     default(listOf(0))
                     widgetType = "multiSelect"
-                    allow(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
+                    allowedValues(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
                 }
                 scheme(Canvas3DOptions::clipping, Clipping)
             }

visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/transform/RemoveSingleChild.kt

@@ -1,12 +1,9 @@
 package space.kscience.visionforge.solid.transform
 
-import space.kscience.dataforge.meta.itemSequence
+import space.kscience.dataforge.meta.update
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.asName
-import space.kscience.visionforge.MutableVisionGroup
-import space.kscience.visionforge.Vision
-import space.kscience.visionforge.VisionGroup
-import space.kscience.visionforge.meta
+import space.kscience.visionforge.*
 import space.kscience.visionforge.solid.*
 
 private operator fun Number.plus(other: Number) = toFloat() + other.toFloat()
@@ -24,10 +21,8 @@ internal fun Vision.updateFrom(other: Vision): Vision {
         scaleX *= other.scaleX
         scaleY *= other.scaleY
         scaleZ *= other.scaleZ
-        other.meta.itemSequence().forEach { (name, item) ->
-            if (getProperty(name) == null) {
-                setProperty(name, item)
-            }
+        configure{
+            update(other.meta())
         }
     }
     return this

visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/ConvexTest.kt

@@ -1,9 +1,8 @@
 package space.kscience.visionforge.solid
 
-import space.kscience.dataforge.meta.MetaItemNode
 import space.kscience.dataforge.meta.getIndexed
 import space.kscience.dataforge.meta.node
-import space.kscience.dataforge.meta.toMetaItem
+import space.kscience.dataforge.meta.toMeta
 import space.kscience.dataforge.misc.DFExperimental
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -29,9 +28,9 @@ class ConvexTest {
         val convex = group.children.values.first() as Convex
 
         val json = Solids.jsonForSolids.encodeToJsonElement(Convex.serializer(), convex)
-        val meta = json.toMetaItem().node!!
+        val meta = json.toMeta()
 
-        val points = meta.getIndexed("points").values.map { (it as MetaItemNode<*>).node.point3D() }
+        val points = meta.getIndexed("points").values.map { it.point3D() }
         assertEquals(8, points.count())
 
         assertEquals(8, convex.points.size)

visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/DescriptorTest.kt

@@ -1,6 +1,5 @@
 package space.kscience.visionforge.solid
 
-import space.kscience.dataforge.meta.descriptors.ValueDescriptor
 import space.kscience.dataforge.meta.descriptors.get
 import space.kscience.dataforge.values.ValueType
 import space.kscience.visionforge.solid.specifications.Canvas3DOptions
@@ -16,7 +15,7 @@ class DescriptorTest {
         val axesSize = descriptor["axes.size"]
         assertNotNull(axesSize)
         assertTrue {
-            ValueType.NUMBER in (axesSize as ValueDescriptor).type!!
+            ValueType.NUMBER in axesSize.valueTypes!!
         }
     }
 }

visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/PropertyTest.kt

@@ -12,7 +12,7 @@ class PropertyTest {
     fun testInheritedProperty() {
         var box: Box? = null
         val group = SolidGroup().apply {
-            setProperty("test", 22)
+            setPropertyNode("test", 22)
             group {
                 box = box(100, 100, 100)
             }

visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/SerializationTest.kt

@@ -1,7 +1,6 @@
 package space.kscience.visionforge.solid
 
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import space.kscience.visionforge.MutableVisionGroup
 import space.kscience.visionforge.get
 import space.kscience.visionforge.meta
@@ -14,7 +13,7 @@ import kotlin.test.assertEquals
  */
 fun SolidGroup.refGroup(
     name: String,
-    templateName: Name = name.toName(),
+    templateName: Name = Name.parse(name),
     block: MutableVisionGroup.() -> Unit
 ): SolidReferenceGroup {
     val group = SolidGroup().apply(block)
@@ -33,7 +32,7 @@ class SerializationTest {
         val string = Solids.encodeToString(cube)
         println(string)
         val newCube = Solids.decodeFromString(string)
-        assertEquals(cube.meta, newCube.meta)
+        assertEquals(cube.meta(), newCube.meta())
     }
 
     @Test
@@ -45,7 +44,7 @@ class SerializationTest {
         }
         val group = SolidGroup {
             ref("cube", cube)
-            refGroup("pg", "pg.content".toName()){
+            refGroup("pg", Name.parse("pg.content")) {
                 sphere(50) {
                     x = -100
                 }
@@ -54,7 +53,7 @@ class SerializationTest {
         val string = Solids.encodeToString(group)
         println(string)
         val reconstructed = Solids.decodeFromString(string) as SolidGroup
-        assertEquals(group["cube"]?.meta, reconstructed["cube"]?.meta)
+        assertEquals(group["cube"]?.meta(), reconstructed["cube"]?.meta())
     }
 
 }

visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/VisionUpdateTest.kt

@@ -2,8 +2,9 @@ package space.kscience.visionforge.solid
 
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.context.fetch
-import space.kscience.dataforge.meta.MetaItem
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.names.asName
+import space.kscience.dataforge.values.asValue
 import space.kscience.visionforge.VisionChange
 import space.kscience.visionforge.get
 import kotlin.test.Test
@@ -24,10 +25,10 @@ class VisionUpdateTest {
                 color(123)
                 box(100,100,100)
             }
-            propertyChanged("top".toName(), SolidMaterial.MATERIAL_COLOR_KEY, MetaItem.of("red"))
-            propertyChanged("origin".toName(), SolidMaterial.MATERIAL_COLOR_KEY, MetaItem.of("red"))
+            propertyChanged("top".asName(), SolidMaterial.MATERIAL_COLOR_KEY, Meta("red".asValue()))
+            propertyChanged("origin".asName(), SolidMaterial.MATERIAL_COLOR_KEY, Meta("red".asValue()))
         }
-        targetVision.update(dif)
+        targetVision.change(dif)
         assertTrue { targetVision["top"] is SolidGroup }
         assertEquals("red", (targetVision["origin"] as Solid).color.string) // Should work
         assertEquals("#00007b", (targetVision["top"] as Solid).color.string) // new item always takes precedence
@@ -40,8 +41,8 @@ class VisionUpdateTest {
                 color(123)
                 box(100,100,100)
             }
-            propertyChanged("top".toName(), SolidMaterial.MATERIAL_COLOR_KEY, MetaItem.of("red"))
-            propertyChanged("origin".toName(), SolidMaterial.MATERIAL_COLOR_KEY, MetaItem.of("red"))
+            propertyChanged("top".asName(), SolidMaterial.MATERIAL_COLOR_KEY, Meta("red".asValue()))
+            propertyChanged("origin".asName(), SolidMaterial.MATERIAL_COLOR_KEY, Meta("red".asValue()))
         }
         val serialized = visionManager.jsonFormat.encodeToString(VisionChange.serializer(), change)
         println(serialized)

visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/MeshThreeFactory.kt

@@ -90,7 +90,7 @@ public fun Mesh.applyEdges(obj: Solid) {
                 MeshThreeFactory.EDGES_MATERIAL_KEY,
                 inherit = true,
                 includeStyles = true
-            ).node,
+            ),
             true
         )
         if (edges == null) {

visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeCanvas.kt

@@ -168,10 +168,10 @@ public class ThreeCanvas(
         }
 
         //Clipping planes
-        options.onChange(this@ThreeCanvas) { name, _, _ ->
+        options.meta.onChange(this@ThreeCanvas) { name->
             if (name.startsWith(Canvas3DOptions::clipping.name.asName())) {
                 val clipping = options.clipping
-                if (!clipping.isEmpty()) {
+                if (!clipping.meta.isEmpty()) {
                     renderer.localClippingEnabled = true
                     boundingBox?.let { boundingBox ->
                         val xClippingPlane = clipping.x?.let {
@@ -212,9 +212,9 @@ public class ThreeCanvas(
     private fun Object3D.fullName(): Name {
         if (root == null) error("Can't resolve element name without the root")
         return if (parent == root) {
-            name.toName()
+            Name.parse(name)
         } else {
-            (parent?.fullName() ?: Name.EMPTY) + name.toName()
+            (parent?.fullName() ?: Name.EMPTY) + Name.parse(name)
         }
     }
 
@@ -237,7 +237,7 @@ public class ThreeCanvas(
     private fun buildLight(spec: Light?): info.laht.threekt.lights.Light = AmbientLight(0x404040)
 
     private fun addControls(element: Node, controls: Controls) {
-        when (controls["type"].string) {
+        when (controls.meta["type"].string) {
             "trackball" -> TrackballControls(camera, element)
             else -> OrbitControls(camera, element)
         }

visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt

@@ -4,7 +4,6 @@ import info.laht.threekt.core.BufferGeometry
 import info.laht.threekt.core.Object3D
 import info.laht.threekt.math.Color
 import info.laht.threekt.objects.LineSegments
-import space.kscience.dataforge.meta.node
 import space.kscience.visionforge.onPropertyChange
 import space.kscience.visionforge.solid.PolyLine
 import space.kscience.visionforge.solid.color
@@ -20,7 +19,10 @@ public object ThreeLineFactory : ThreeFactory<PolyLine> {
             setFromPoints(Array(obj.points.size) { obj.points[it].toVector() })
         }
 
-        val material = ThreeMaterials.getLineMaterial(obj.getProperty(MeshThreeFactory.EDGES_MATERIAL_KEY).node, true)
+        val material = ThreeMaterials.getLineMaterial(
+            obj.getProperty(MeshThreeFactory.EDGES_MATERIAL_KEY),
+            true
+        )
 
         material.linewidth = obj.thickness.toDouble()
         material.color = obj.color.string?.let { Color(it) } ?: DEFAULT_LINE_COLOR

visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeMaterials.kt

@@ -13,7 +13,7 @@ import space.kscience.dataforge.values.int
 import space.kscience.dataforge.values.string
 import space.kscience.visionforge.Colors
 import space.kscience.visionforge.Vision
-import space.kscience.visionforge.ownProperties
+import space.kscience.visionforge.meta
 import space.kscience.visionforge.solid.SolidMaterial
 
 
@@ -41,7 +41,7 @@ public object ThreeMaterials {
     private val lineMaterialCache = HashMap<Meta, LineBasicMaterial>()
 
     private fun buildLineMaterial(meta: Meta): LineBasicMaterial = LineBasicMaterial().apply {
-        color = meta[SolidMaterial.COLOR_KEY]?.getColor() ?: DEFAULT_LINE_COLOR
+        color = meta[SolidMaterial.COLOR_KEY]?.threeColor() ?: DEFAULT_LINE_COLOR
         opacity = meta[SolidMaterial.OPACITY_KEY].double ?: 1.0
         transparent = opacity < 1.0
         linewidth = meta["thickness"].double ?: 1.0
@@ -59,11 +59,12 @@ public object ThreeMaterials {
     private val materialCache = HashMap<Meta, Material>()
 
     internal fun buildMaterial(meta: Meta): Material {
+        val material = SolidMaterial.read(meta)
         return meta[SolidMaterial.SPECULAR_COLOR_KEY]?.let { specularColor ->
             MeshPhongMaterial().apply {
-                color = meta[SolidMaterial.COLOR_KEY]?.getColor() ?: DEFAULT_COLOR
-                specular = specularColor.getColor()
-                emissive = specular
+                color = meta[SolidMaterial.COLOR_KEY]?.threeColor() ?: DEFAULT_COLOR
+                specular = specularColor.threeColor()
+                emissive = material.emissiveColor.item?.threeColor() ?: specular
                 reflectivity = 0.5
                 refractionRatio = 1.0
                 shininess = 100.0
@@ -73,7 +74,7 @@ public object ThreeMaterials {
                 needsUpdate = true
             }
         } ?: MeshBasicMaterial().apply {
-            color = meta[SolidMaterial.COLOR_KEY]?.getColor() ?: DEFAULT_COLOR
+            color = meta[SolidMaterial.COLOR_KEY]?.threeColor() ?: DEFAULT_COLOR
             opacity = meta[SolidMaterial.OPACITY_KEY]?.double ?: 1.0
             transparent = opacity < 1.0
             wireframe = meta[SolidMaterial.WIREFRAME_KEY].boolean ?: false
@@ -93,23 +94,20 @@ public object ThreeMaterials {
 /**
  * Infer color based on meta item
  */
-public fun MetaItem.getColor(): Color {
-    return when (this) {
-        is MetaItemValue -> if (this.value.type == ValueType.NUMBER) {
+public fun Meta.threeColor(): Color {
+    return value?.let { value ->
+        if (value.type == ValueType.NUMBER) {
             val int = value.int
             Color(int)
         } else {
-            Color(this.value.string)
+            Color(value.string)
         }
-        is MetaItemNode -> {
-            Color(
-                node[Colors.RED_KEY]?.int ?: 0,
-                node[Colors.GREEN_KEY]?.int ?: 0,
-                node[Colors.BLUE_KEY]?.int ?: 0
+    } ?: Color(
+        this[Colors.RED_KEY]?.int ?: 0,
+        this[Colors.GREEN_KEY]?.int ?: 0,
+        this[Colors.BLUE_KEY]?.int ?: 0
     )
 }
-    }
-}
 
 private var Material.cached: Boolean
     get() = userData["cached"] == true
@@ -119,7 +117,7 @@ private var Material.cached: Boolean
 
 public fun Mesh.updateMaterial(vision: Vision) {
     //val meta = vision.getProperty(SolidMaterial.MATERIAL_KEY, inherit = true).node
-    val ownMaterialMeta = vision.ownProperties[SolidMaterial.MATERIAL_KEY]
+    val ownMaterialMeta = vision.meta()[SolidMaterial.MATERIAL_KEY]
     val parentMaterialMeta = vision.parent?.getProperty(
         SolidMaterial.MATERIAL_KEY,
         inherit = true,
@@ -135,7 +133,7 @@ public fun Mesh.updateMaterial(vision: Vision) {
                 inherit = false,
                 includeStyles = true,
                 includeDefaults = false
-            ).node?.let {
+            )?.let {
                 ThreeMaterials.cacheMaterial(it)
             } ?: ThreeMaterials.DEFAULT
         }
@@ -143,7 +141,7 @@ public fun Mesh.updateMaterial(vision: Vision) {
             vision.getProperty(
                 SolidMaterial.MATERIAL_KEY,
                 inherit = true
-            ).node?.let {
+            )?.let {
                 ThreeMaterials.buildMaterial(it)
             } ?: ThreeMaterials.DEFAULT
         }
@@ -162,7 +160,7 @@ public fun Mesh.updateMaterialProperty(vision: Vision, propertyName: Name) {
                     inherit = true,
                     includeStyles = true,
                     includeDefaults = false
-                )?.getColor() ?: ThreeMaterials.DEFAULT_COLOR
+                )?.threeColor() ?: ThreeMaterials.DEFAULT_COLOR
                 material.needsUpdate = true
             }
             SolidMaterial.MATERIAL_OPACITY_KEY -> {

visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt

@@ -143,7 +143,7 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
             element,
             vision as? Solid ?: error("Solid expected but ${vision::class} found"),
         ).apply {
-            options.update(meta)
+            options.meta.update(meta)
         }
     }
 
@@ -196,7 +196,3 @@ internal fun Object3D.findChild(name: Name): Object3D? {
         else -> findChild(name.tokens.first().asName())?.findChild(name.cutFirst())
     }
 }
-
-public fun Context.withThreeJs(): Context = apply {
-    plugins.fetch(ThreePlugin)
-}

visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeReferenceFactory.kt

@@ -3,9 +3,9 @@ package space.kscience.visionforge.solid.three
 import info.laht.threekt.core.BufferGeometry
 import info.laht.threekt.core.Object3D
 import info.laht.threekt.objects.Mesh
+import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.cutFirst
 import space.kscience.dataforge.names.firstOrNull
-import space.kscience.dataforge.names.toName
 import space.kscience.visionforge.onPropertyChange
 import space.kscience.visionforge.solid.Solid
 import space.kscience.visionforge.solid.SolidReferenceGroup
@@ -49,7 +49,7 @@ public object ThreeReferenceFactory : ThreeFactory<SolidReferenceGroup> {
 
         obj.onPropertyChange(three.updateScope) { name->
             if (name.firstOrNull()?.body == REFERENCE_CHILD_PROPERTY_PREFIX) {
-                val childName = name.firstOrNull()?.index?.toName() ?: error("Wrong syntax for reference child property: '$name'")
+                val childName = name.firstOrNull()?.index?.let(Name::parse) ?: error("Wrong syntax for reference child property: '$name'")
                 val propertyName = name.cutFirst()
                 val referenceChild = obj[childName] ?: error("Reference child with name '$childName' not found")
                 val child = object3D.findChild(childName) ?: error("Object child with name '$childName' not found")