Name revolution

CHANGELOG.md

@@ -11,6 +11,7 @@
 - Build tools 0.10.0
 - Relaxed type restriction on `MetaConverter`. Now nullables are available.
 - **Huge API-breaking refactoring of Meta**. Meta now can hava both value and children.
+- **API breaking** `String.toName()` is replaced by `Name.parse()`
 
 ### Deprecated
 - Direct use of `Config`

build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.5.0-dev-3"
+    version = "0.5.0-dev-4"
 }
 
 subprojects {

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/ContextBuilder.kt

@@ -7,8 +7,9 @@ import space.kscience.dataforge.meta.toMutableMeta
 import space.kscience.dataforge.misc.DFBuilder
 import space.kscience.dataforge.misc.DFExperimental
 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.names.toName
 import kotlin.collections.component1
 import kotlin.collections.component2
 import kotlin.collections.set
@@ -30,7 +31,7 @@ public class ContextBuilder internal constructor(
     }
 
     public fun name(string: String) {
-        this.name = string.toName()
+        this.name = Name.parse(string)
     }
 
     @OptIn(DFExperimental::class)
@@ -63,7 +64,7 @@ public class ContextBuilder internal constructor(
     }
 
     public fun build(): Context {
-        val contextName = name ?: "@auto[${hashCode().toUInt().toString(16)}]".toName()
+        val contextName = name ?: NameToken("@auto",hashCode().toUInt().toString(16)).asName()
         val plugins = HashMap<PluginTag, Plugin>()
 
         fun addPlugin(factory: PluginFactory<*>, meta: Meta) {

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Plugin.kt

@@ -6,7 +6,6 @@ import space.kscience.dataforge.meta.MetaRepr
 import space.kscience.dataforge.misc.Named
 import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import space.kscience.dataforge.provider.Provider
 
 /**
@@ -31,7 +30,7 @@ public interface Plugin : Named, ContextAware, Provider, MetaRepr {
     /**
      * The name of this plugin ignoring version and group
      */
-    override val name: Name get() = tag.name.toName()
+    override val name: Name get() = Name.parse(tag.name)
 
     /**
      * Plugin dependencies which are required to attach this plugin. Plugin

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/properties/schemeProperty.kt

@@ -1,14 +1,14 @@
 package space.kscience.dataforge.properties
 
 
-import space.kscience.dataforge.meta.ObservableMeta
+import space.kscience.dataforge.meta.Scheme
 import space.kscience.dataforge.misc.DFExperimental
+import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.startsWith
-import space.kscience.dataforge.names.toName
 import kotlin.reflect.KMutableProperty1
 
 @DFExperimental
-public fun <P : ObservableMeta, T : Any> P.property(property: KMutableProperty1<P, T?>): Property<T?> =
+public fun <S : Scheme, T : Any> S.property(property: KMutableProperty1<S, T?>): Property<T?> =
     object : Property<T?> {
         override var value: T?
             get() = property.get(this@property)
@@ -17,15 +17,15 @@ public fun <P : ObservableMeta, T : Any> P.property(property: KMutableProperty1<
             }
 
         override fun onChange(owner: Any?, callback: (T?) -> Unit) {
-            this@property.onChange(this) { name ->
+            this@property.meta.onChange(this) { name ->
-                if (name.startsWith(property.name.toName())) {
+                if (name.startsWith(Name.parse(property.name))) {
                     callback(property.get(this@property))
                 }
             }
         }
 
         override fun removeChangeListener(owner: Any?) {
-            this@property.removeListener(this@property)
+            this@property.meta.removeListener(this@property)
         }
 
     }

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/provider/Path.kt

@@ -16,7 +16,6 @@
 package space.kscience.dataforge.provider
 
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import kotlin.jvm.JvmInline
 
 /**
@@ -63,7 +62,7 @@ public data class PathToken(val name: Name, val target: String? = null) {
         public const val TARGET_SEPARATOR: String = "::"
         public fun parse(token: String): PathToken {
             val target = token.substringBefore(TARGET_SEPARATOR, "")
-            val name = token.substringAfter(TARGET_SEPARATOR).toName()
+            val name = Name.parse(token.substringAfter(TARGET_SEPARATOR))
             if (target.contains("[")) TODO("target separators in queries are not supported")
             return PathToken(name, target)
         }

dataforge-context/src/commonTest/kotlin/space/kscience/dataforge/context/ContextTest.kt

@@ -2,7 +2,6 @@ package space.kscience.dataforge.context
 
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.appendLeft
-import space.kscience.dataforge.names.toName
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -12,17 +11,16 @@ class ContextTest {
         override val tag get() = PluginTag("test")
 
         override fun content(target: String): Map<Name, Any> {
-            return when(target){
+            return when (target) {
-                "test" -> listOf("a", "b", "c.d").associate { it.toName() to it.toName() }
+                "test" -> listOf("a", "b", "c.d").associate { Name.parse(it) to Name.parse(it) }
                 else -> emptyMap()
             }
         }
-
     }
 
     @Test
     fun testPluginManager() {
-        val context = Global.buildContext{
+        val context = Global.buildContext {
             name("test")
             plugin(DummyPlugin())
         }

dataforge-context/src/commonTest/kotlin/space/kscience/dataforge/properties/MetaPropertiesTest.kt

@@ -14,7 +14,7 @@ internal class TestScheme : Scheme() {
 }
 
 @DFExperimental
-class ItemPropertiesTest {
+class MetaPropertiesTest {
     @Test
     fun testBinding() {
         val scheme = TestScheme.empty()

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/ReduceAction.kt

@@ -11,7 +11,6 @@ import space.kscience.dataforge.misc.DFBuilder
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.misc.DFInternal
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import kotlin.reflect.KType
 import kotlin.reflect.typeOf
 
@@ -95,7 +94,7 @@ internal class ReduceAction<T : Any, R : Any>(
 
             val groupMeta = group.meta
 
-            val env = ActionEnv(groupName.toName(), groupMeta, meta)
+            val env = ActionEnv(Name.parse(groupName), groupMeta, meta)
             @OptIn(DFInternal::class) val res: Data<R> = dataFlow.reduceToData(
                 outputType,
                 meta = groupMeta

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/SplitAction.kt

@@ -12,7 +12,6 @@ import space.kscience.dataforge.meta.toMutableMeta
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.misc.DFInternal
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import kotlin.collections.set
 import kotlin.reflect.KType
 import kotlin.reflect.typeOf
@@ -36,7 +35,7 @@ public class SplitBuilder<T : Any, R : Any>(public val name: Name, public val me
      * @param rule the rule to transform fragment name and meta using
      */
     public fun fragment(name: String, rule: FragmentRule<T, R>.() -> Unit) {
-        fragments[name.toName()] = rule
+        fragments[Name.parse(name)] = rule
     }
 }
 

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/ActiveDataTree.kt

@@ -115,4 +115,4 @@ public suspend inline fun <reified T : Any> ActiveDataTree<T>.emit(
 public suspend inline fun <reified T : Any> ActiveDataTree<T>.emit(
     name: String,
     noinline block: suspend ActiveDataTree<T>.() -> Unit,
-): Unit = emit(name.toName(), ActiveDataTree(typeOf<T>(), block))
+): Unit = emit(Name.parse(name), ActiveDataTree(typeOf<T>(), block))

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSetBuilder.kt

@@ -8,7 +8,6 @@ import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.plus
-import space.kscience.dataforge.names.toName
 import kotlin.reflect.KType
 
 public interface DataSetBuilder<in T : Any> {
@@ -39,17 +38,17 @@ public interface DataSetBuilder<in T : Any> {
     /**
      * Append data to node
      */
-    public suspend infix fun String.put(data: Data<T>): Unit = emit(toName(), data)
+    public suspend infix fun String.put(data: Data<T>): Unit = emit(Name.parse(this), data)
 
     /**
      * Append node
      */
-    public suspend infix fun String.put(dataSet: DataSet<T>): Unit = emit(toName(), dataSet)
+    public suspend infix fun String.put(dataSet: DataSet<T>): Unit = emit(Name.parse(this), dataSet)
 
     /**
      * Build and append node
      */
-    public suspend infix fun String.put(block: suspend DataSetBuilder<T>.() -> Unit): Unit = emit(toName(), block)
+    public suspend infix fun String.put(block: suspend DataSetBuilder<T>.() -> Unit): Unit = emit(Name.parse(this), block)
 }
 
 private class SubSetBuilder<in T : Any>(
@@ -77,15 +76,15 @@ public suspend fun <T : Any> DataSetBuilder<T>.emit(name: Name, block: suspend D
 
 
 public suspend fun <T : Any> DataSetBuilder<T>.emit(name: String, data: Data<T>) {
-    emit(name.toName(), data)
+    emit(Name.parse(name), data)
 }
 
 public suspend fun <T : Any> DataSetBuilder<T>.emit(name: String, set: DataSet<T>) {
-    this.emit(name.toName(), set)
+    this.emit(Name.parse(name), set)
 }
 
 public suspend fun <T : Any> DataSetBuilder<T>.emit(name: String, block: suspend DataSetBuilder<T>.() -> Unit): Unit =
-    this@emit.emit(name.toName(), block)
+    this@emit.emit(Name.parse(name), block)
 
 public suspend fun <T : Any> DataSetBuilder<T>.emit(data: NamedData<T>) {
     emit(data.name, data.data)
@@ -115,17 +114,25 @@ public suspend inline fun <reified T : Any> DataSetBuilder<T>.produce(
 /**
  * Emit a static data with the fixed value
  */
-public suspend inline fun <reified T : Any> DataSetBuilder<T>.static(name: String, data: T, meta: Meta = Meta.EMPTY): Unit =
+public suspend inline fun <reified T : Any> DataSetBuilder<T>.static(
+    name: String,
+    data: T,
+    meta: Meta = Meta.EMPTY
+): Unit =
     emit(name, Data.static(data, meta))
 
-public suspend inline fun <reified T : Any> DataSetBuilder<T>.static(name: Name, data: T, meta: Meta = Meta.EMPTY): Unit =
+public suspend inline fun <reified T : Any> DataSetBuilder<T>.static(
+    name: Name,
+    data: T,
+    meta: Meta = Meta.EMPTY
+): Unit =
     emit(name, Data.static(data, meta))
 
 public suspend inline fun <reified T : Any> DataSetBuilder<T>.static(
     name: String,
     data: T,
     mutableMeta: MutableMeta.() -> Unit,
-): Unit = emit(name.toName(), Data.static(data, Meta(mutableMeta)))
+): Unit = emit(Name.parse(name), Data.static(data, Meta(mutableMeta)))
 
 /**
  * Update data with given node data and meta with node meta.

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataTree.kt

@@ -57,7 +57,7 @@ public interface DataTree<out T : Any> : DataSet<T> {
     }
 }
 
-public suspend fun <T: Any> DataSet<T>.getData(name: String): Data<T>? = getData(name.toName())
+public suspend fun <T: Any> DataSet<T>.getData(name: String): Data<T>? = getData(Name.parse(name))
 
 /**
  * Get a [DataTreeItem] with given [name] or null if the item does not exist

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataFilter.kt

@@ -5,7 +5,10 @@ import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.mapNotNull
 import space.kscience.dataforge.misc.DFExperimental
-import space.kscience.dataforge.names.*
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.isEmpty
+import space.kscience.dataforge.names.plus
+import space.kscience.dataforge.names.removeHeadOrNull
 import kotlin.reflect.KType
 
 
@@ -64,7 +67,7 @@ public fun <T : Any> DataSet<T>.branch(branchName: Name): DataSet<T> = if (branc
     override val updates: Flow<Name> get() = this@branch.updates.mapNotNull { it.removeHeadOrNull(branchName) }
 }
 
-public fun <T : Any> DataSet<T>.branch(branchName: String): DataSet<T> = this@branch.branch(branchName.toName())
+public fun <T : Any> DataSet<T>.branch(branchName: String): DataSet<T> = this@branch.branch(Name.parse(branchName))
 
 @DFExperimental
 public suspend fun <T : Any> DataSet<T>.rootData(): Data<T>? = getData(Name.EMPTY)

dataforge-data/src/jvmMain/kotlin/space/kscience/dataforge/data/select.kt

@@ -6,7 +6,6 @@ import kotlinx.coroutines.flow.map
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.matches
-import space.kscience.dataforge.names.toName
 import kotlin.reflect.KType
 import kotlin.reflect.full.isSubtypeOf
 import kotlin.reflect.typeOf
@@ -61,4 +60,4 @@ public suspend fun <R : Any> DataSet<*>.selectOne(type: KType, name: Name): Name
 public suspend inline fun <reified R : Any> DataSet<*>.selectOne(name: Name): NamedData<R>? = selectOne(typeOf<R>(), name)
 
 public suspend inline fun <reified R : Any> DataSet<*>.selectOne(name: String): NamedData<R>? =
-    selectOne(typeOf<R>(), name.toName())
+    selectOne(typeOf<R>(), Name.parse(name))

dataforge-data/src/jvmTest/kotlin/space/kscience/dataforge/data/DataTreeBuilderTest.kt

@@ -3,7 +3,7 @@ package space.kscience.dataforge.data
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.collect
 import space.kscience.dataforge.misc.DFExperimental
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.asName
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -72,7 +72,7 @@ internal class DataTreeBuilderTest {
                     }
                 }
                 val rootNode = ActiveDataTree<Int> {
-                    setAndObserve("sub".toName(), subNode)
+                    setAndObserve("sub".asName(), subNode)
                 }
 
                 launch {

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeParts.kt

@@ -10,12 +10,11 @@ import space.kscience.dataforge.io.PartDescriptor.Companion.SEPARATOR_KEY
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
-import space.kscience.dataforge.names.toName
 
 private class PartDescriptor : Scheme() {
     var offset by int(0)
     var size by int(0)
-    var partMeta by item("meta".toName())
+    var partMeta by item("meta".asName())
 
     companion object : SchemeSpec<PartDescriptor>(::PartDescriptor) {
         val MULTIPART_KEY = ENVELOPE_NODE_KEY + "multipart"

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOPlugin.kt

@@ -10,7 +10,7 @@ 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.dataforge.names.toName
+
 import kotlin.native.concurrent.ThreadLocal
 import kotlin.reflect.KClass
 
@@ -23,7 +23,7 @@ public class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
 
     public fun <T : Any> resolveIOFormat(item: Meta, type: KClass<out T>): IOFormat<T>? {
         val key = item.string ?: item[NAME_KEY]?.string ?: error("Format name not defined")
-        val name = key.toName()
+        val name = Name.parse(key)
         return ioFormatFactories.find { it.name == name }?.let {
             @Suppress("UNCHECKED_CAST")
             if (it.type != type) error("Format type ${it.type} is not the same as requested type $type")
@@ -52,7 +52,7 @@ public class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
     public fun resolveEnvelopeFormat(item: Meta): EnvelopeFormat? {
         val name = item.string ?: item[NAME_KEY]?.string ?: error("Envelope format name not defined")
         val meta = item[META_KEY] ?: Meta.EMPTY
-        return resolveEnvelopeFormat(name.toName(), meta)
+        return resolveEnvelopeFormat(Name.parse(name), meta)
     }
 
     override fun content(target: String): Map<Name, Any> {

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaggedEnvelopeFormat.kt

@@ -10,7 +10,7 @@ import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.plus
-import space.kscience.dataforge.names.toName
+
 
 /**
  * A streaming-friendly envelope format with a short binary tag.
@@ -121,7 +121,7 @@ public class TaggedEnvelopeFormat(
         override fun invoke(meta: Meta, context: Context): EnvelopeFormat {
             val io = context.io
 
-            val metaFormatName = meta["name"].string?.toName() ?: JsonMetaFormat.name
+            val metaFormatName = meta["name"].string?.let { Name.parse(it) } ?: JsonMetaFormat.name
             //Check if appropriate factory exists
             io.metaFormatFactories.find { it.name == metaFormatName } ?: error("Meta format could not be resolved")
 

dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MetaSerializerTest.kt

@@ -7,7 +7,6 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MetaSerializer
 import space.kscience.dataforge.meta.seal
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -43,7 +42,7 @@ class MetaSerializerTest {
 
     @Test
     fun testNameSerialization() {
-        val name = "a.b.c".toName()
+        val name = Name.parse("a.b.c")
         val string = JSON_PRETTY.encodeToString(Name.serializer(), name)
         val restored = JSON_PLAIN.decodeFromString(Name.serializer(), string)
         assertEquals(name, restored)

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt

@@ -16,6 +16,13 @@ public interface MetaRepr {
     public fun toMeta(): Meta
 }
 
+/**
+ * A container for meta nodes
+ */
+public fun interface MetaProvider {
+    public fun getMeta(name: Name): Meta?
+}
+
 /**
  * A meta node
  * TODO add documentation
@@ -23,10 +30,12 @@ public interface MetaRepr {
  */
 @Type(Meta.TYPE)
 @Serializable(MetaSerializer::class)
-public interface Meta : MetaRepr {
+public interface Meta : MetaRepr, MetaProvider {
     public val value: Value?
     public val items: Map<NameToken, Meta>
 
+    override fun getMeta(name: Name): Meta? = find(name)
+
     override fun toMeta(): Meta = this
 
     override fun toString(): String
@@ -66,6 +75,12 @@ public interface Meta : MetaRepr {
         public fun toString(meta: Meta): String = json.encodeToString(MetaSerializer, meta)
 
         public val EMPTY: Meta = SealedMeta(null, emptyMap())
+
+        private tailrec fun Meta.find(name: Name): Meta? = if (name.isEmpty()) {
+            this
+        } else {
+            items[name.firstOrNull()!!]?.find(name.cutFirst())
+        }
     }
 }
 
@@ -82,16 +97,12 @@ public operator fun Meta.get(token: NameToken): Meta? = items[token]
  *
  * If [name] is empty return current [Meta]
  */
-public tailrec operator fun Meta.get(name: Name): Meta? = if (name.isEmpty()) {
+public operator fun Meta.get(name: Name): Meta? = getMeta(name)
-    this
-} else {
-    get(name.firstOrNull()!!)?.get(name.cutFirst())
-}
 
 /**
  * Parse [Name] from [key] using full name notation and pass it to [Meta.get]
  */
-public operator fun Meta.get(key: String): Meta? = this[key.toName()]
+public operator fun Meta.get(key: String): Meta? = this[Name.parse(key)]
 
 /**
  * Get all items matching given name. The index of the last element, if present is used as a [Regex],
@@ -155,7 +166,7 @@ public tailrec operator fun <M : TypedMeta<M>> TypedMeta<M>.get(name: Name): M?
 /**
  * Parse [Name] from [key] using full name notation and pass it to [TypedMeta.get]
  */
-public operator fun <M : TypedMeta<M>> TypedMeta<M>.get(key: String): M? = this[key.toName()]
+public operator fun <M : TypedMeta<M>> TypedMeta<M>.get(key: String): M? = this[Name.parse(key)]
 
 
 /**
@@ -197,7 +208,7 @@ public fun Meta.isEmpty(): Boolean = this === Meta.EMPTY || (value == null && it
 public fun <M : TypedMeta<M>> TypedMeta<M>.getIndexed(name: Name): Map<String?, M> =
     (this as Meta).getIndexed(name) as Map<String?, M>
 
-public fun <M : TypedMeta<M>> TypedMeta<M>.getIndexed(name: String): Map<String?, Meta> = getIndexed(name.toName())
+public fun <M : TypedMeta<M>> TypedMeta<M>.getIndexed(name: String): Map<String?, Meta> = getIndexed(Name.parse(name))
 
 
 public val Meta?.string: String? get() = this?.value?.string

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt

@@ -10,8 +10,8 @@ import kotlin.properties.ReadOnlyProperty
 
 public typealias MetaDelegate = ReadOnlyProperty<Any?, Meta?>
 
-public fun Meta.item(key: Name? = null): MetaDelegate = ReadOnlyProperty { _, property ->
+public fun MetaProvider.item(key: Name? = null): MetaDelegate = ReadOnlyProperty { _, property ->
-    get(key ?: property.name.asName())
+    getMeta(key ?: property.name.asName())
 }
 
 //TODO add caching for sealed nodes
@@ -50,62 +50,62 @@ public fun <R> MetaDelegate.convert(
 /**
  * A property delegate that uses custom key
  */
-public fun Meta.value(key: Name? = null): ReadOnlyProperty<Any?, Value?> =
+public fun MetaProvider.value(key: Name? = null): ReadOnlyProperty<Any?, Value?> =
     item(key).convert(MetaConverter.value)
 
-public fun Meta.string(key: Name? = null): ReadOnlyProperty<Any?, String?> =
+public fun MetaProvider.string(key: Name? = null): ReadOnlyProperty<Any?, String?> =
     item(key).convert(MetaConverter.string)
 
-public fun Meta.boolean(key: Name? = null): ReadOnlyProperty<Any?, Boolean?> =
+public fun MetaProvider.boolean(key: Name? = null): ReadOnlyProperty<Any?, Boolean?> =
     item(key).convert(MetaConverter.boolean)
 
-public fun Meta.number(key: Name? = null): ReadOnlyProperty<Any?, Number?> =
+public fun MetaProvider.number(key: Name? = null): ReadOnlyProperty<Any?, Number?> =
     item(key).convert(MetaConverter.number)
 
-public fun Meta.double(key: Name? = null): ReadOnlyProperty<Any?, Double?> =
+public fun MetaProvider.double(key: Name? = null): ReadOnlyProperty<Any?, Double?> =
     item(key).convert(MetaConverter.double)
 
-public fun Meta.float(key: Name? = null): ReadOnlyProperty<Any?, Float?> =
+public fun MetaProvider.float(key: Name? = null): ReadOnlyProperty<Any?, Float?> =
     item(key).convert(MetaConverter.float)
 
-public fun Meta.int(key: Name? = null): ReadOnlyProperty<Any?, Int?> =
+public fun MetaProvider.int(key: Name? = null): ReadOnlyProperty<Any?, Int?> =
     item(key).convert(MetaConverter.int)
 
-public fun Meta.long(key: Name? = null): ReadOnlyProperty<Any?, Long?> =
+public fun MetaProvider.long(key: Name? = null): ReadOnlyProperty<Any?, Long?> =
     item(key).convert(MetaConverter.long)
 
-public fun Meta.node(key: Name? = null): ReadOnlyProperty<Any?, Meta?> =
+public fun MetaProvider.node(key: Name? = null): ReadOnlyProperty<Any?, Meta?> =
     item(key).convert(MetaConverter.meta)
 
-public fun Meta.string(default: String, key: Name? = null): ReadOnlyProperty<Any?, String> =
+public fun MetaProvider.string(default: String, key: Name? = null): ReadOnlyProperty<Any?, String> =
     item(key).convert(MetaConverter.string) { default }
 
-public fun Meta.boolean(default: Boolean, key: Name? = null): ReadOnlyProperty<Any?, Boolean> =
+public fun MetaProvider.boolean(default: Boolean, key: Name? = null): ReadOnlyProperty<Any?, Boolean> =
     item(key).convert(MetaConverter.boolean) { default }
 
-public fun Meta.number(default: Number, key: Name? = null): ReadOnlyProperty<Any?, Number> =
+public fun MetaProvider.number(default: Number, key: Name? = null): ReadOnlyProperty<Any?, Number> =
     item(key).convert(MetaConverter.number) { default }
 
-public fun Meta.double(default: Double, key: Name? = null): ReadOnlyProperty<Any?, Double> =
+public fun MetaProvider.double(default: Double, key: Name? = null): ReadOnlyProperty<Any?, Double> =
     item(key).convert(MetaConverter.double) { default }
 
-public fun Meta.float(default: Float, key: Name? = null): ReadOnlyProperty<Any?, Float> =
+public fun MetaProvider.float(default: Float, key: Name? = null): ReadOnlyProperty<Any?, Float> =
     item(key).convert(MetaConverter.float) { default }
 
-public fun Meta.int(default: Int, key: Name? = null): ReadOnlyProperty<Any?, Int> =
+public fun MetaProvider.int(default: Int, key: Name? = null): ReadOnlyProperty<Any?, Int> =
     item(key).convert(MetaConverter.int) { default }
 
-public fun Meta.long(default: Long, key: Name? = null): ReadOnlyProperty<Any?, Long> =
+public fun MetaProvider.long(default: Long, key: Name? = null): ReadOnlyProperty<Any?, Long> =
     item(key).convert(MetaConverter.long) { default }
 
-public inline fun <reified E : Enum<E>> Meta.enum(default: E, key: Name? = null): ReadOnlyProperty<Any?, E> =
+public inline fun <reified E : Enum<E>> MetaProvider.enum(default: E, key: Name? = null): ReadOnlyProperty<Any?, E> =
     item(key).convert(MetaConverter.enum()) { default }
 
-public fun Meta.string(key: Name? = null, default: () -> String): ReadOnlyProperty<Any?, String> =
+public fun MetaProvider.string(key: Name? = null, default: () -> String): ReadOnlyProperty<Any?, String> =
     item(key).convert(MetaConverter.string, default)
 
-public fun Meta.boolean(key: Name? = null, default: () -> Boolean): ReadOnlyProperty<Any?, Boolean> =
+public fun MetaProvider.boolean(key: Name? = null, default: () -> Boolean): ReadOnlyProperty<Any?, Boolean> =
     item(key).convert(MetaConverter.boolean, default)
 
-public fun Meta.number(key: Name? = null, default: () -> Number): ReadOnlyProperty<Any?, Number> =
+public fun MetaProvider.number(key: Name? = null, default: () -> Number): ReadOnlyProperty<Any?, Number> =
     item(key).convert(MetaConverter.number, default)

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt

@@ -16,13 +16,17 @@ import kotlin.jvm.Synchronized
 @DslMarker
 public annotation class MetaBuilder
 
+public interface MutableMetaProvider : MetaProvider {
+    public fun setMeta(name: Name, node: Meta?)
+}
+
 /**
  * Mutable variant of [Meta]
  * TODO documentation
  */
 @Serializable(MutableMetaSerializer::class)
 @MetaBuilder
-public interface MutableMeta : Meta {
+public interface MutableMeta : Meta, MutableMetaProvider {
 
     override val items: Map<NameToken, MutableMeta>
 
@@ -36,6 +40,14 @@ public interface MutableMeta : Meta {
      */
     public operator fun set(name: Name, meta: Meta)
 
+    override fun setMeta(name: Name, node: Meta?) {
+        if (node == null) {
+            remove(name)
+        } else {
+            set(name, node)
+        }
+    }
+
     /**
      * Remove a node at a given [name] if it is present
      */
@@ -85,47 +97,47 @@ public interface MutableMeta : Meta {
     }
 
     public infix fun String.put(meta: Meta) {
-        toName() put meta
+        Name.parse(this) put meta
     }
 
     public infix fun String.put(value: Value?) {
-        set(toName(), value)
+        set(Name.parse(this), value)
     }
 
     public infix fun String.put(string: String) {
-        set(toName(), string.asValue())
+        set(Name.parse(this), string.asValue())
     }
 
     public infix fun String.put(number: Number) {
-        set(toName(), number.asValue())
+        set(Name.parse(this), number.asValue())
     }
 
     public infix fun String.put(boolean: Boolean) {
-        set(toName(), boolean.asValue())
+        set(Name.parse(this), boolean.asValue())
     }
 
     public infix fun String.put(enum: Enum<*>) {
-        set(toName(), EnumValue(enum))
+        set(Name.parse(this), EnumValue(enum))
     }
 
     public infix fun String.put(array: DoubleArray) {
-        set(toName(), array.asValue())
+        set(Name.parse(this), array.asValue())
     }
 
     public infix fun String.put(repr: MetaRepr) {
-        toName() put repr.toMeta()
+        Name.parse(this) put repr.toMeta()
     }
 
     public infix fun String.put(iterable: Iterable<Meta>) {
-        setIndexed(toName(), iterable)
+        setIndexed(Name.parse(this), iterable)
     }
 
     public infix fun String.put(builder: MutableMeta.() -> Unit) {
-        set(toName(), MutableMeta(builder))
+        set(Name.parse(this), MutableMeta(builder))
     }
 }
 
-public fun MutableMeta.getOrCreate(string: String): MutableMeta = getOrCreate(string.toName())
+public fun MutableMeta.getOrCreate(key: String): MutableMeta = getOrCreate(Name.parse(key))
 
 @Serializable(MutableMetaSerializer::class)
 public interface MutableTypedMeta<M : MutableTypedMeta<M>> : TypedMeta<M>, MutableMeta {
@@ -138,47 +150,37 @@ public interface MutableTypedMeta<M : MutableTypedMeta<M>> : TypedMeta<M>, Mutab
     override fun getOrCreate(name: Name): M
 }
 
-public fun <M : MutableTypedMeta<M>> M.getOrCreate(string: String): M = getOrCreate(string.toName())
+public fun <M : MutableTypedMeta<M>> M.getOrCreate(key: String): M = getOrCreate(Name.parse(key))
 
-public fun MutableMeta.remove(name: String){
+public fun MutableMeta.remove(key: String) {
-    remove(name.toName())
+    remove(Name.parse(key))
 }
 
 // node setters
 
-public operator fun MutableMeta.set(name: NameToken, value: Meta): Unit = set(name.asName(), value)
+public operator fun MutableMetaProvider.set(Key: NameToken, value: Meta): Unit = setMeta(Key.asName(), value)
-public operator fun MutableMeta.set(name: Name, meta: Meta?): Unit {
+public operator fun MutableMetaProvider.set(key: String, value: Meta): Unit = setMeta(Name.parse(key), value)
-    if (meta == null) {
-        remove(name)
-    } else {
-        set(name, meta)
-    }
-}
-
-public operator fun MutableMeta.set(key: String, meta: Meta?): Unit {
-    set(key.toName(), meta)
-}
 
 //value setters
 
 public operator fun MutableMeta.set(name: NameToken, value: Value?): Unit = set(name.asName(), value)
-public operator fun MutableMeta.set(key: String, value: Value?): Unit = set(key.toName(), value)
+public operator fun MutableMeta.set(key: String, value: Value?): Unit = set(Name.parse(key), value)
 
 public operator fun MutableMeta.set(name: Name, value: String): Unit = set(name, value.asValue())
 public operator fun MutableMeta.set(name: NameToken, value: String): Unit = set(name.asName(), value.asValue())
-public operator fun MutableMeta.set(key: String, value: String): Unit = set(key.toName(), value.asValue())
+public operator fun MutableMeta.set(key: String, value: String): Unit = set(Name.parse(key), value.asValue())
 
 public operator fun MutableMeta.set(name: Name, value: Boolean): Unit = set(name, value.asValue())
 public operator fun MutableMeta.set(name: NameToken, value: Boolean): Unit = set(name.asName(), value.asValue())
-public operator fun MutableMeta.set(key: String, value: Boolean): Unit = set(key.toName(), value.asValue())
+public operator fun MutableMeta.set(key: String, value: Boolean): Unit = set(Name.parse(key), value.asValue())
 
 public operator fun MutableMeta.set(name: Name, value: Number): Unit = set(name, value.asValue())
 public operator fun MutableMeta.set(name: NameToken, value: Number): Unit = set(name.asName(), value.asValue())
-public operator fun MutableMeta.set(key: String, value: Number): Unit = set(key.toName(), value.asValue())
+public operator fun MutableMeta.set(key: String, value: Number): Unit = set(Name.parse(key), value.asValue())
 
 public operator fun MutableMeta.set(name: Name, value: List<Value>): Unit = set(name, value.asValue())
 public operator fun MutableMeta.set(name: NameToken, value: List<Value>): Unit = set(name.asName(), value.asValue())
-public operator fun MutableMeta.set(key: String, value: List<Value>): Unit = set(key.toName(), value.asValue())
+public operator fun MutableMeta.set(key: String, value: List<Value>): Unit = set(Name.parse(key), value.asValue())
 
 //public fun MutableMeta.set(key: String, index: String, value: Value?): Unit =
 //    set(key.toName().withIndex(index), value)
@@ -218,8 +220,8 @@ public fun MutableMeta.setIndexed(
 public operator fun MutableMeta.set(name: Name, metas: Iterable<Meta>): Unit =
     setIndexed(name, metas)
 
-public operator fun MutableMeta.set(name: String, metas: Iterable<Meta>): Unit =
+public operator fun MutableMeta.set(key: String, metas: Iterable<Meta>): Unit =
-    setIndexed(name.toName(), metas)
+    setIndexed(Name.parse(key), metas)
 
 
 /**
@@ -396,13 +398,13 @@ public fun MutableMeta.append(name: Name, meta: Meta) {
 }
 
 @DFExperimental
-public fun MutableMeta.append(name: String, meta: Meta): Unit = append(name.toName(), meta)
+public fun MutableMeta.append(key: String, meta: Meta): Unit = append(Name.parse(key), meta)
 
 @DFExperimental
 public fun MutableMeta.append(name: Name, value: Value): Unit = append(name, Meta(value))
 
 @DFExperimental
-public fun MutableMeta.append(name: String, value: Value): Unit = append(name.toName(), value)
+public fun MutableMeta.append(key: String, value: Value): Unit = append(Name.parse(key), value)
 
 ///**
 // * Apply existing node with given [builder] or create a new element with it.
@@ -443,8 +445,9 @@ public inline fun Meta.copy(block: MutableMeta.() -> Unit = {}): Meta =
     toMutableMeta().apply(block)
 
 
-private class MutableMetaWithDefault(val source: MutableMeta, val default: Meta, val name: Name) :
+private class MutableMetaWithDefault(
-    MutableMeta by source {
+    val source: MutableMeta, val default: Meta, val name: Name
+) : MutableMeta by source {
     override val items: Map<NameToken, MutableMeta>
         get() = (source.items.keys + default.items.keys).associateWith {
             MutableMetaWithDefault(source, default, name + it)
@@ -456,6 +459,8 @@ private class MutableMetaWithDefault(val source: MutableMeta, val default: Meta,
             source[name] = value
         }
 
+    override fun getMeta(name: Name): Meta? = source.getMeta(name) ?: default.getMeta(name)
+
     override fun toString(): String = Meta.toString(this)
     override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
     override fun hashCode(): Int = Meta.hashCode(this)

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMetaDelegate.kt

@@ -11,14 +11,14 @@ import kotlin.reflect.KProperty
 
 public typealias MutableMetaDelegate = ReadWriteProperty<Any?, Meta?>
 
-public fun MutableMeta.item(key: Name? = null): MutableMetaDelegate = object : MutableMetaDelegate {
+public fun MutableMetaProvider.item(key: Name? = null): MutableMetaDelegate = object : MutableMetaDelegate {
     override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? {
-        return get(key ?: property.name.asName())
+        return getMeta(key ?: property.name.asName())
     }
 
     override fun setValue(thisRef: Any?, property: KProperty<*>, value: Meta?) {
         val name = key ?: property.name.asName()
-        set(name, value)
+        setMeta(name, value)
     }
 }
 
@@ -74,40 +74,40 @@ public fun <R> MutableMetaDelegate.convert(
 /**
  * A property delegate that uses custom key
  */
-public fun MutableMeta.value(key: Name? = null): ReadWriteProperty<Any?, Value?> =
+public fun MutableMetaProvider.value(key: Name? = null): ReadWriteProperty<Any?, Value?> =
     item(key).convert(MetaConverter.value)
 
-public fun MutableMeta.string(key: Name? = null): ReadWriteProperty<Any?, String?> =
+public fun MutableMetaProvider.string(key: Name? = null): ReadWriteProperty<Any?, String?> =
     item(key).convert(MetaConverter.string)
 
-public fun MutableMeta.boolean(key: Name? = null): ReadWriteProperty<Any?, Boolean?> =
+public fun MutableMetaProvider.boolean(key: Name? = null): ReadWriteProperty<Any?, Boolean?> =
     item(key).convert(MetaConverter.boolean)
 
-public fun MutableMeta.number(key: Name? = null): ReadWriteProperty<Any?, Number?> =
+public fun MutableMetaProvider.number(key: Name? = null): ReadWriteProperty<Any?, Number?> =
     item(key).convert(MetaConverter.number)
 
-public fun MutableMeta.string(default: String, key: Name? = null): ReadWriteProperty<Any?, String> =
+public fun MutableMetaProvider.string(default: String, key: Name? = null): ReadWriteProperty<Any?, String> =
     item(key).convert(MetaConverter.string) { default }
 
-public fun MutableMeta.boolean(default: Boolean, key: Name? = null): ReadWriteProperty<Any?, Boolean> =
+public fun MutableMetaProvider.boolean(default: Boolean, key: Name? = null): ReadWriteProperty<Any?, Boolean> =
     item(key).convert(MetaConverter.boolean) { default }
 
-public fun MutableMeta.number(default: Number, key: Name? = null): ReadWriteProperty<Any?, Number> =
+public fun MutableMetaProvider.number(default: Number, key: Name? = null): ReadWriteProperty<Any?, Number> =
     item(key).convert(MetaConverter.number) { default }
 
-public fun MutableMeta.value(key: Name? = null, default: () -> Value): ReadWriteProperty<Any?, Value> =
+public fun MutableMetaProvider.value(key: Name? = null, default: () -> Value): ReadWriteProperty<Any?, Value> =
     item(key).convert(MetaConverter.value, default)
 
-public fun MutableMeta.string(key: Name? = null, default: () -> String): ReadWriteProperty<Any?, String> =
+public fun MutableMetaProvider.string(key: Name? = null, default: () -> String): ReadWriteProperty<Any?, String> =
     item(key).convert(MetaConverter.string, default)
 
-public fun MutableMeta.boolean(key: Name? = null, default: () -> Boolean): ReadWriteProperty<Any?, Boolean> =
+public fun MutableMetaProvider.boolean(key: Name? = null, default: () -> Boolean): ReadWriteProperty<Any?, Boolean> =
     item(key).convert(MetaConverter.boolean, default)
 
-public fun MutableMeta.number(key: Name? = null, default: () -> Number): ReadWriteProperty<Any?, Number> =
+public fun MutableMetaProvider.number(key: Name? = null, default: () -> Number): ReadWriteProperty<Any?, Number> =
     item(key).convert(MetaConverter.number, default)
 
-public inline fun <reified E : Enum<E>> MutableMeta.enum(
+public inline fun <reified E : Enum<E>> MutableMetaProvider.enum(
     default: E,
     key: Name? = null,
 ): ReadWriteProperty<Any?, E> =
@@ -115,37 +115,37 @@ public inline fun <reified E : Enum<E>> MutableMeta.enum(
 
 /* Number delegates */
 
-public fun MutableMeta.int(key: Name? = null): ReadWriteProperty<Any?, Int?> =
+public fun MutableMetaProvider.int(key: Name? = null): ReadWriteProperty<Any?, Int?> =
     item(key).convert(MetaConverter.int)
 
-public fun MutableMeta.double(key: Name? = null): ReadWriteProperty<Any?, Double?> =
+public fun MutableMetaProvider.double(key: Name? = null): ReadWriteProperty<Any?, Double?> =
     item(key).convert(MetaConverter.double)
 
-public fun MutableMeta.long(key: Name? = null): ReadWriteProperty<Any?, Long?> =
+public fun MutableMetaProvider.long(key: Name? = null): ReadWriteProperty<Any?, Long?> =
     item(key).convert(MetaConverter.long)
 
-public fun MutableMeta.float(key: Name? = null): ReadWriteProperty<Any?, Float?> =
+public fun MutableMetaProvider.float(key: Name? = null): ReadWriteProperty<Any?, Float?> =
     item(key).convert(MetaConverter.float)
 
 
 /* Safe number delegates*/
 
-public fun MutableMeta.int(default: Int, key: Name? = null): ReadWriteProperty<Any?, Int> =
+public fun MutableMetaProvider.int(default: Int, key: Name? = null): ReadWriteProperty<Any?, Int> =
     item(key).convert(MetaConverter.int) { default }
 
-public fun MutableMeta.double(default: Double, key: Name? = null): ReadWriteProperty<Any?, Double> =
+public fun MutableMetaProvider.double(default: Double, key: Name? = null): ReadWriteProperty<Any?, Double> =
     item(key).convert(MetaConverter.double) { default }
 
-public fun MutableMeta.long(default: Long, key: Name? = null): ReadWriteProperty<Any?, Long> =
+public fun MutableMetaProvider.long(default: Long, key: Name? = null): ReadWriteProperty<Any?, Long> =
     item(key).convert(MetaConverter.long) { default }
 
-public fun MutableMeta.float(default: Float, key: Name? = null): ReadWriteProperty<Any?, Float> =
+public fun MutableMetaProvider.float(default: Float, key: Name? = null): ReadWriteProperty<Any?, Float> =
     item(key).convert(MetaConverter.float) { default }
 
 
 /* Extra delegates for special cases */
 
-public fun MutableMeta.stringList(
+public fun MutableMetaProvider.stringList(
     vararg default: String,
     key: Name? = null,
 ): ReadWriteProperty<Any?, List<String>> = item(key).convert(
@@ -153,14 +153,14 @@ public fun MutableMeta.stringList(
     writer = { Meta(it.map { str -> str.asValue() }.asValue()) }
 )
 
-public fun MutableMeta.stringList(
+public fun MutableMetaProvider.stringList(
     key: Name? = null,
 ): ReadWriteProperty<Any?, List<String>?> = item(key).convert(
     reader = { it?.stringList },
     writer = { it?.map { str -> str.asValue() }?.asValue()?.let { Meta(it) } }
 )
 
-public fun MutableMeta.numberList(
+public fun MutableMetaProvider.numberList(
     vararg default: Number,
     key: Name? = null,
 ): ReadWriteProperty<Any?, List<Number>> = item(key).convert(
@@ -171,7 +171,7 @@ public fun MutableMeta.numberList(
 /* A special delegate for double arrays */
 
 
-public fun MutableMeta.doubleArray(
+public fun MutableMetaProvider.doubleArray(
     vararg default: Double,
     key: Name? = null,
 ): ReadWriteProperty<Any?, DoubleArray> = item(key).convert(
@@ -179,7 +179,7 @@ public fun MutableMeta.doubleArray(
     writer = { Meta(DoubleArrayValue(it)) }
 )
 
-public fun <T> MutableMeta.listValue(
+public fun <T> MutableMetaProvider.listValue(
     key: Name? = null,
     writer: (T) -> Value = { Value.of(it) },
     reader: (Value) -> T,

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMeta.kt

@@ -1,9 +1,6 @@
 package space.kscience.dataforge.meta
 
-import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.*
-import space.kscience.dataforge.names.NameToken
-import space.kscience.dataforge.names.asName
-import space.kscience.dataforge.names.startsWith
 import space.kscience.dataforge.values.Value
 import kotlin.jvm.Synchronized
 import kotlin.reflect.KProperty1
@@ -57,6 +54,8 @@ private class ObservableMetaWrapper(
     override val items: Map<NameToken, ObservableMetaWrapper>
         get() = origin.items.mapValues { ObservableMetaWrapper(it.value) }
 
+    override fun getMeta(name: Name): Meta? = origin.getMeta(name)
+
     override var value: Value?
         get() = origin.value
         set(value) {
@@ -86,7 +85,10 @@ private class ObservableMetaWrapper(
     }
 
     override fun attach(name: Name, node: ObservableMutableMeta) {
-        TODO("Not yet implemented")
+        set(name, node)
+        node.onChange(this) { changeName ->
+            setMeta(name + changeName, node[changeName])
+        }
     }
 }
 
@@ -104,14 +106,14 @@ public fun MutableMeta.asObservable(): ObservableMutableMeta =
  *
  * Optional [owner] property is used for
  */
-public fun <O : ObservableMeta, T> O.useProperty(
+public fun <S : Scheme, T> S.useProperty(
-    property: KProperty1<O, T>,
+    property: KProperty1<S, T>,
     owner: Any? = null,
-    callBack: O.(T) -> Unit,
+    callBack: S.(T) -> Unit,
 ) {
     //Pass initial value.
     callBack(property.get(this))
-    onChange(owner) { name ->
+    meta.onChange(owner) { name ->
         if (name.startsWith(property.name.asName())) {
             callBack(property.get(this@useProperty))
         }

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Scheme.kt

@@ -2,35 +2,24 @@ package space.kscience.dataforge.meta
 
 import space.kscience.dataforge.meta.descriptors.*
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.NameToken
-import space.kscience.dataforge.values.Value
 
 /**
  * A base for delegate-based or descriptor-based scheme. [Scheme] has an empty constructor to simplify usage from [Specification].
- * Default item provider and [NodeDescriptor] are optional
+ * Default item provider and [MetaDescriptor] are optional
  */
-public open class Scheme(
+public open class Scheme : Described, MetaRepr, MutableMetaProvider {
-    source: MutableMeta = MutableMeta()
-) : Described, MutableMeta, ObservableMeta, Meta by source {
 
-    private var source = source.asObservable()
+    public var meta: ObservableMutableMeta = MutableMeta()
+        private set
 
     final override var descriptor: MetaDescriptor? = null
         internal set
 
-    override var value: Value?
-        get() = source.value
-        set(value) {
-            source.value = value
-        }
-
-    override val items: Map<NameToken, MutableMeta> get() = source.items
-
     internal fun wrap(
         items: MutableMeta,
         preserveDefault: Boolean = false
     ) {
-        this.source = (if (preserveDefault) items.withDefault(this.source) else items).asObservable()
+        meta = (if (preserveDefault) items.withDefault(meta.seal()) else items).asObservable()
     }
 
     /**
@@ -41,35 +30,17 @@ public open class Scheme(
         return descriptor?.validate(meta) ?: true
     }
 
-    /**
+    override fun getMeta(name: Name): Meta? = meta.getMeta(name)
-     * Set a configurable property
+
-     */
+    override fun setMeta(name: Name, node: Meta?) {
-    override fun set(name: Name, meta: Meta) {
-        val oldItem = source[name]
-        if (oldItem != meta) {
         if (validate(name, meta)) {
-                source[name] = meta
+            meta.setMeta(name, node)
         } else {
-                error("Validation failed for property $name with value $meta")
+            error("Validation failed for node $node at $name")
-            }
         }
     }
 
-    override fun toMeta(): Laminate = Laminate(source, descriptor?.defaultNode)
+    override fun toMeta(): Laminate = Laminate(meta, descriptor?.defaultNode)
-
-    override fun remove(name: Name) {
-        source.remove(name)
-    }
-
-    override fun getOrCreate(name: Name): MutableMeta = source.getOrCreate(name)
-
-    override fun onChange(owner: Any?, callback: Meta.(name: Name) -> Unit) {
-        source.onChange(owner ?: this, callback)
-    }
-
-    override fun removeListener(owner: Any?) {
-        source.removeListener(owner ?: this)
-    }
 }
 
 /**

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Specification.kt

@@ -77,6 +77,11 @@ public fun <T : Scheme> MutableMeta.spec(
     }
 }
 
+public fun <T : Scheme> Scheme.spec(
+    spec: Specification<T>,
+    key: Name? = null,
+): ReadWriteProperty<Any?, T> = meta.spec(spec, key)
+
 /**
  * A delegate that uses a [Specification] to wrap a list of child providers.
  * If children are mutable, the changes in list elements are reflected on them.

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptor.kt

@@ -43,7 +43,7 @@ public operator fun MetaDescriptor.get(name: Name): MetaDescriptor? = when (name
     else -> get(name.firstOrNull()!!.asName())?.get(name.cutFirst())
 }
 
-public operator fun MetaDescriptor.get(name: String): MetaDescriptor? = get(name.toName())
+public operator fun MetaDescriptor.get(name: String): MetaDescriptor? = get(Name.parse(name))
 
 /**
  * A node constructed of default values for this descriptor and its children

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder.kt

@@ -4,10 +4,22 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.set
-import space.kscience.dataforge.names.*
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.cutFirst
+import space.kscience.dataforge.names.first
+import space.kscience.dataforge.names.length
 import space.kscience.dataforge.values.Value
 import space.kscience.dataforge.values.ValueType
 import space.kscience.dataforge.values.asValue
+import kotlin.collections.List
+import kotlin.collections.MutableMap
+import kotlin.collections.emptyList
+import kotlin.collections.getOrPut
+import kotlin.collections.hashMapOf
+import kotlin.collections.listOf
+import kotlin.collections.map
+import kotlin.collections.mapValues
+import kotlin.collections.set
 
 public class MetaDescriptorBuilder {
     public var info: String? = null
@@ -67,7 +79,7 @@ public class MetaDescriptorBuilder {
 }
 
 public fun MetaDescriptorBuilder.item(name: String, block: MetaDescriptorBuilder.() -> Unit) {
-    item(name.toName(), block)
+    item(Name.parse(name), block)
 }
 
 public fun MetaDescriptor(block: MetaDescriptorBuilder.() -> Unit): MetaDescriptor =
@@ -94,7 +106,7 @@ public fun MetaDescriptorBuilder.value(
     vararg additionalTypes: ValueType,
     block: MetaDescriptorBuilder.() -> Unit
 ) {
-    value(name.toName(), type, additionalTypes = additionalTypes, block)
+    value(Name.parse(name), type, additionalTypes = additionalTypes, block)
 }
 
 /**
@@ -108,7 +120,7 @@ public fun MetaDescriptorBuilder.node(name: Name, block: MetaDescriptorBuilder.(
 }
 
 public fun MetaDescriptorBuilder.node(name: String, block: MetaDescriptorBuilder.() -> Unit) {
-    node(name.toName(), block)
+    node(Name.parse(name), block)
 }
 
 public inline fun <reified E : Enum<E>> MetaDescriptorBuilder.enum(

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/mapMeta.kt

@@ -3,7 +3,7 @@ package space.kscience.dataforge.meta
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.get
 import space.kscience.dataforge.misc.DFExperimental
-import space.kscience.dataforge.names.toName
+import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.values.ListValue
 import space.kscience.dataforge.values.Value
 
@@ -28,7 +28,7 @@ public fun Meta.toMap(descriptor: MetaDescriptor? = null): Map<String, Any?> = b
 
 /**
  * Convert map of maps to meta. This method will recognize [Meta], [Map]<String,Any?> and [List] of all mentioned above as value.
- * All other values will be converted to values.
+ * All other values will be converted to [Value].
  */
 @DFExperimental
 public fun Map<String, Any?>.toMeta(descriptor: MetaDescriptor? = null): Meta = Meta {
@@ -45,7 +45,7 @@ public fun Map<String, Any?>.toMeta(descriptor: MetaDescriptor? = null): Meta =
             if (items.all { it.isLeaf }) {
                 set(key, ListValue(items.map { it.value!! }))
             } else {
-                setIndexedItems(key.toName(), value.map { toMeta(it) })
+                setIndexedItems(Name.parse(key), value.map { toMeta(it) })
             }
         } else {
             set(key, toMeta(value))

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaTransformation.kt

@@ -42,7 +42,7 @@ public data class KeepTransformationRule(val selector: (Name) -> Boolean) :
         meta.nodeSequence().map { it.first }.filter(selector)
 
     override fun transformItem(name: Name, item: Meta?, target: MutableMeta) {
-        if (selector(name)) target.set(name, item)
+        if (selector(name)) target.setMeta(name, item)
     }
 }
 
@@ -174,7 +174,7 @@ public class MetaTransformationBuilder {
     public fun keep(regex: String) {
         transformations.add(
             RegexItemTransformationRule(regex.toRegex()) { name, _, Meta ->
-                set(name, Meta)
+                setMeta(name, Meta)
             })
     }
 
@@ -184,7 +184,7 @@ public class MetaTransformationBuilder {
     public fun move(from: Name, to: Name, operation: (Meta?) -> Meta? = { it }) {
         transformations.add(
             SingleItemTransformationRule(from) { _, item ->
-                set(to, operation(item))
+                setMeta(to, operation(item))
             }
         )
     }

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/Name.kt

@@ -47,45 +47,13 @@ public class Name(public val tokens: List<NameToken>) {
         public val MATCH_ALL_TOKEN: NameToken = NameToken("**")
 
         public val EMPTY: Name = Name(emptyList())
-    }
-}
 
-public operator fun Name.get(i: Int): NameToken = tokens[i]
+        /**
-
-/**
- * The reminder of the name after last element is cut. For empty name return itself.
- */
-public fun Name.cutLast(): Name = Name(tokens.dropLast(1))
-
-/**
- * The reminder of the name after first element is cut. For empty name return itself.
- */
-public fun Name.cutFirst(): Name = Name(tokens.drop(1))
-
-public val Name.length: Int get() = tokens.size
-
-/**
- * Last token of the name or null if it is empty
- */
-public fun Name.lastOrNull(): NameToken? = tokens.lastOrNull()
-
-/**
- * First token of the name or null if it is empty
- */
-public fun Name.firstOrNull(): NameToken? = tokens.firstOrNull()
-
-/**
- * First token or throw exception
- */
-public fun Name.first(): NameToken = tokens.first()
-
-
-/**
          * Convert a [String] to name parsing it and extracting name tokens and index syntax.
          * This operation is rather heavy so it should be used with care in high performance code.
          */
-public fun String.toName(): Name {
+        public fun parse(string: String): Name{
-    if (isBlank()) return Name.EMPTY
+            if (string.isBlank()) return Name.EMPTY
             val tokens = sequence {
                 var bodyBuilder = StringBuilder()
                 var queryBuilder = StringBuilder()
@@ -93,7 +61,7 @@ public fun String.toName(): Name {
                 var escape: Boolean = false
                 fun queryOn() = bracketCount > 0
 
-        for (it in this@toName) {
+                for (it in string) {
                     when {
                         escape -> {
                             if (queryOn()) {
@@ -133,8 +101,40 @@ public fun String.toName(): Name {
                 yield(NameToken(bodyBuilder.toString(), query))
             }
             return Name(tokens.toList())
+        }
+    }
 }
 
+public operator fun Name.get(i: Int): NameToken = tokens[i]
+
+/**
+ * The reminder of the name after last element is cut. For empty name return itself.
+ */
+public fun Name.cutLast(): Name = Name(tokens.dropLast(1))
+
+/**
+ * The reminder of the name after first element is cut. For empty name return itself.
+ */
+public fun Name.cutFirst(): Name = Name(tokens.drop(1))
+
+public val Name.length: Int get() = tokens.size
+
+/**
+ * Last token of the name or null if it is empty
+ */
+public fun Name.lastOrNull(): NameToken? = tokens.lastOrNull()
+
+/**
+ * First token of the name or null if it is empty
+ */
+public fun Name.firstOrNull(): NameToken? = tokens.firstOrNull()
+
+/**
+ * First token or throw exception
+ */
+public fun Name.first(): NameToken = tokens.first()
+
+
 /**
  * Convert the [String] to a [Name] by simply wrapping it in a single name token without parsing.
  * The input string could contain dots and braces, but they are just escaped, not parsed.
@@ -145,7 +145,7 @@ public operator fun NameToken.plus(other: Name): Name = Name(listOf(this) + othe
 
 public operator fun Name.plus(other: Name): Name = Name(this.tokens + other.tokens)
 
-public operator fun Name.plus(other: String): Name = this + other.toName()
+public operator fun Name.plus(other: String): Name = this + Name.parse(other)
 
 public operator fun Name.plus(other: NameToken): Name = Name(tokens + other)
 
@@ -174,8 +174,8 @@ public fun Name.withIndex(index: String): Name {
  * Fast [String]-based accessor for item map
  */
 public operator fun <T> Map<NameToken, T>.get(body: String, query: String? = null): T? = get(NameToken(body, query))
-public operator fun <T> Map<Name, T>.get(name: String): T? = get(name.toName())
+public operator fun <T> Map<Name, T>.get(name: String): T? = get(Name.parse(name))
-public operator fun <T> MutableMap<Name, T>.set(name: String, value: T): Unit = set(name.toName(), value)
+public operator fun <T> MutableMap<Name, T>.set(name: String, value: T): Unit = set(Name.parse(name), value)
 
 /* Name comparison operations */
 

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/NameSerializer.kt

@@ -12,7 +12,7 @@ public object NameSerializer : KSerializer<Name> {
         PrimitiveSerialDescriptor("space.kscience.dataforge.names.Name", PrimitiveKind.STRING)
 
     override fun deserialize(decoder: Decoder): Name {
-        return decoder.decodeString().toName()
+        return Name.parse(decoder.decodeString())
     }
 
     override fun serialize(encoder: Encoder, value: Name) {
@@ -25,7 +25,7 @@ public object NameTokenSerializer: KSerializer<NameToken> {
         PrimitiveSerialDescriptor("space.kscience.dataforge.names.NameToken", PrimitiveKind.STRING)
 
     override fun deserialize(decoder: Decoder): NameToken {
-        return decoder.decodeString().toName().firstOrNull()!!
+        return Name.parse(decoder.decodeString()).firstOrNull()!!
     }
 
     override fun serialize(

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/nameMatcher.kt

@@ -44,4 +44,4 @@ public fun Name.matches(pattern: Name): Boolean = when {
 }
 
 @OptIn(DFExperimental::class)
-public fun Name.matches(pattern: String): Boolean = matches(pattern.toName())
+public fun Name.matches(pattern: String): Boolean = matches(Name.parse(pattern))

dataforge-meta/src/commonTest/kotlin/space/kscience/dataforge/meta/MetaDelegateTest.kt

@@ -30,7 +30,7 @@ class MetaDelegateTest {
     fun delegateTest() {
 
         val testObject = TestScheme.empty()
-        testObject.set("myValue","theString".asValue())
+        testObject.meta["myValue"] = "theString".asValue()
         testObject.enumValue = TestEnum.NO
 
         testObject.inner = InnerScheme { innerValue = "ddd" }

dataforge-meta/src/commonTest/kotlin/space/kscience/dataforge/names/NameMatchTest.kt

@@ -10,7 +10,7 @@ import kotlin.test.assertTrue
 class NameMatchTest {
     @Test
     fun matchWildCards() {
-        val theName = "a.b.c.d".toName()
+        val theName = Name.parse("a.b.c.d")
         assertTrue { theName.matches("a.b.**") }
         assertTrue { theName.matches("a.*.c.**") }
         assertTrue { theName.matches("**.d") }
@@ -22,7 +22,7 @@ class NameMatchTest {
 
     @Test
     fun matchPattern() {
-        val theName = "a[dd+2].b[13].c.d[\"d\"]".toName()
+        val theName = Name.parse("a[dd+2].b[13].c.d[\"d\"]")
         assertTrue { theName.matches("a[.*].b[.*].c[.*].d[.*]") }
         assertTrue { theName.matches("a[.*].b[.*].c.d[.*]") }
         assertFalse { theName.matches("a[.*].b[.*].*.d") }

dataforge-meta/src/commonTest/kotlin/space/kscience/dataforge/names/NameSerializationTest.kt

@@ -9,7 +9,7 @@ class NameSerializationTest {
 
     @Test
     fun testNameSerialization() {
-        val name = "aaa.bbb.ccc".toName()
+        val name = Name.parse("aaa.bbb.ccc")
         val json = Json.encodeToJsonElement(Name.serializer(), name)
         println(json)
         val reconstructed = Json.decodeFromJsonElement(Name.serializer(), json)

dataforge-meta/src/commonTest/kotlin/space/kscience/dataforge/names/NameTest.kt

@@ -8,22 +8,22 @@ import kotlin.test.assertTrue
 class NameTest {
     @Test
     fun simpleName() {
-        val name = "token1.token2.token3".toName()
+        val name = Name.parse("token1.token2.token3")
         assertEquals("token2", name[1].toString())
     }
 
     @Test
     fun equalityTest() {
-        val name1 = "token1.token2[2].token3".toName()
+        val name1 = Name.parse("token1.token2[2].token3")
-        val name2 = "token1".toName() + "token2[2].token3"
+        val name2 = "token1".asName() + "token2[2].token3"
         assertEquals(name1, name2)
     }
 
     @Test
     fun comparisonTest(){
-        val name1 = "token1.token2.token3".toName()
+        val name1 = Name.parse("token1.token2.token3")
-        val name2 = "token1.token2".toName()
+        val name2 = Name.parse("token1.token2")
-        val name3 = "token3".toName()
+        val name3 = Name.parse("token3")
         assertTrue { name1.startsWith(name2) }
         assertTrue { name1.endsWith(name3) }
         assertFalse { name1.startsWith(name3) }
@@ -31,11 +31,11 @@ class NameTest {
 
     @Test
     fun escapeTest(){
-        val escapedName = "token\\.one.token2".toName()
+        val escapedName = Name.parse("token\\.one.token2")
         val unescapedName = "token\\.one.token2".asName()
 
         assertEquals(2, escapedName.length)
         assertEquals(1, unescapedName.length)
-        assertEquals(escapedName, escapedName.toString().toName())
+        assertEquals(escapedName, Name.parse(escapedName.toString()))
     }
 }

dataforge-meta/src/jsMain/kotlin/space/kscience/dataforge/meta/DynamicMeta.kt

@@ -1,6 +1,5 @@
 package space.kscience.dataforge.meta
 
-import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.NameToken
 import space.kscience.dataforge.values.Value
 import space.kscience.dataforge.values.asValue
@@ -8,7 +7,6 @@ import space.kscience.dataforge.values.isList
 
 
 //TODO add Meta wrapper for dynamic
-@DFExperimental
 public fun Value.toDynamic(): dynamic {
     return if (isList()) {
         list.map { it.toDynamic() }.toTypedArray().asDynamic()
@@ -20,7 +18,6 @@ public fun Value.toDynamic(): dynamic {
 /**
  * Represent or copy this [Meta] to dynamic object to be passed to JS libraries
  */
-@DFExperimental
 public fun Meta.toDynamic(): dynamic {
     if (this is DynamicMeta) return this.obj
     if(items.isEmpty()) return value?.toDynamic()
@@ -36,7 +33,6 @@ public fun Meta.toDynamic(): dynamic {
     return res
 }
 
-@DFExperimental
 public class DynamicMeta(internal val obj: dynamic) : TypedMeta<DynamicMeta> {
     private fun keys(): Array<String> = js("Object").keys(obj) as Array<String>
 

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt

@@ -5,7 +5,6 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import space.kscience.dataforge.provider.Provider
 
 
@@ -28,7 +27,7 @@ public interface Workspace : ContextAware, Provider {
 
     override fun content(target: String): Map<Name, Any> {
         return when (target) {
-            "target", Meta.TYPE -> targets.mapKeys { it.key.toName() }
+            "target", Meta.TYPE -> targets.mapKeys { Name.parse(it.key)}
             Task.TYPE -> tasks
             //Data.TYPE -> data.flow().toMap()
             else -> emptyMap()
@@ -50,10 +49,10 @@ public interface Workspace : ContextAware, Provider {
 }
 
 public suspend fun Workspace.produce(task: String, target: String): TaskResult<*> =
-    produce(task.toName(), targets[target] ?: error("Target with key $target not found in $this"))
+    produce(Name.parse(task), targets[target] ?: error("Target with key $target not found in $this"))
 
 public suspend fun Workspace.produce(task: String, meta: Meta): TaskResult<*> =
-    produce(task.toName(), meta)
+    produce(Name.parse(task), meta)
 
 public suspend fun Workspace.produce(task: String, block: MutableMeta.() -> Unit = {}): TaskResult<*> =
     produce(task, Meta(block))

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt

@@ -14,7 +14,6 @@ import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
 import space.kscience.dataforge.misc.DFBuilder
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.toName
 import kotlin.properties.PropertyDelegateProvider
 import kotlin.properties.ReadOnlyProperty
 
@@ -29,13 +28,13 @@ public inline fun <reified T : Any> TaskContainer.registerTask(
     name: String,
     noinline descriptorBuilder: MetaDescriptorBuilder.() -> Unit = {},
     noinline builder: suspend TaskResultBuilder<T>.() -> Unit,
-): Unit = registerTask(name.toName(), Task(MetaDescriptor(descriptorBuilder), builder))
+): Unit = registerTask(Name.parse(name), Task(MetaDescriptor(descriptorBuilder), builder))
 
 public inline fun <reified T : Any> TaskContainer.task(
     noinline descriptorBuilder: MetaDescriptorBuilder.() -> Unit = {},
     noinline builder: suspend TaskResultBuilder<T>.() -> Unit,
 ): PropertyDelegateProvider<Any?, ReadOnlyProperty<Any?, TaskReference<T>>> = PropertyDelegateProvider { _, property ->
-    val taskName = property.name.toName()
+    val taskName = Name.parse(property.name)
     val task = Task(MetaDescriptor(descriptorBuilder), builder)
     registerTask(taskName, task)
     ReadOnlyProperty { _, _ -> TaskReference(taskName, task) }

dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/DataPropagationTest.kt

@@ -7,7 +7,6 @@ import space.kscience.dataforge.context.PluginFactory
 import space.kscience.dataforge.context.PluginTag
 import space.kscience.dataforge.data.*
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.names.toName
 import kotlin.reflect.KClass
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -25,7 +24,7 @@ class DataPropagationTestPlugin : WorkspacePlugin() {
 
 
     val singleData by task<Int> {
-        workspace.data.select<Int>().getData("myData[12]".toName())?.let {
+        workspace.data.select<Int>().getData("myData[12]")?.let {
             emit("result", it)
         }
     }