diff --git a/dataforge-vis-spatial-fx/build.gradle.kts b/dataforge-vis-spatial-fx/build.gradle.kts
index 5ed73278..03fd4813 100644
--- a/dataforge-vis-spatial-fx/build.gradle.kts
+++ b/dataforge-vis-spatial-fx/build.gradle.kts
@@ -1,3 +1,4 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import org.openjfx.gradle.JavaFXOptions
 
 plugins {
@@ -13,4 +14,10 @@ dependencies {
 
 configure<JavaFXOptions> {
     modules("javafx.controls")
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions{
+        jvmTarget = "1.8"
+    }
 }
\ No newline at end of file
diff --git a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreeOutput.kt b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreeOutput.kt
index 2945daa8..c9d2592e 100644
--- a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreeOutput.kt
+++ b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreeOutput.kt
@@ -1,7 +1,7 @@
 package hep.dataforge.vis.spatial
 
 import hep.dataforge.context.Context
-import hep.dataforge.context.members
+import hep.dataforge.context.content
 import hep.dataforge.meta.*
 import hep.dataforge.output.Output
 import hep.dataforge.vis.DisplayGroup
@@ -75,7 +75,7 @@ class ThreeOutput(override val context: Context, val meta: Meta = EmptyMeta) : O
     }
 
     private fun <T : DisplayObject> findFactory(type: KClass<out T>): ThreeFactory<T>? {
-        return context.members<ThreeFactory<*>>(ThreeFactory.TYPE).find { it.type == type } as? ThreeFactory<T>?
+        return context.content<ThreeFactory<*>>(ThreeFactory.TYPE).values.find { it.type == type } as? ThreeFactory<T>?
     }
 
     override fun render(obj: DisplayObject, meta: Meta) {
diff --git a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreePlugin.kt b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreePlugin.kt
index 67836113..267da2d4 100644
--- a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreePlugin.kt
+++ b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/ThreePlugin.kt
@@ -3,6 +3,7 @@ package hep.dataforge.vis.spatial
 import hep.dataforge.context.AbstractPlugin
 import hep.dataforge.context.PluginFactory
 import hep.dataforge.context.PluginTag
+import hep.dataforge.meta.Meta
 import hep.dataforge.names.Name
 import hep.dataforge.names.toName
 
@@ -16,10 +17,12 @@ class ThreePlugin : AbstractPlugin() {
         factories["convex".toName()] = ThreeConvexFactory
     }
 
-    override fun listTop(target: String): Sequence<Name> {
+
+
+    override fun listNames(target: String): Sequence<Name> {
         return when (target) {
             ThreeFactory.TYPE -> factories.keys.asSequence()
-            else -> return super.listTop(target)
+            else -> return super.listNames(target)
         }
     }
 
@@ -33,6 +36,6 @@ class ThreePlugin : AbstractPlugin() {
     companion object : PluginFactory<ThreePlugin> {
         override val tag = PluginTag("vis.three", "hep.dataforge")
         override val type = ThreePlugin::class
-        override fun invoke()  = ThreePlugin()
+        override fun invoke(meta: Meta)  = ThreePlugin()
     }
 }
\ No newline at end of file
diff --git a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLNodes.kt b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLNodes.kt
index 70fb8842..40747435 100644
--- a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLNodes.kt
+++ b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLNodes.kt
@@ -4,7 +4,7 @@ import hep.dataforge.meta.*
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
-sealed class GDMLNode(override val config: Config) : Specification {
+sealed class GDMLNode(override val config: Config) : Specific {
     var pName by string()
 }
 
@@ -16,7 +16,7 @@ class GDMLPosition(config: Config) : GDMLDefine(config) {
     var z by number(0f).float
     var unit by string("cm")
 
-    companion object : SpecificationCompanion<GDMLPosition> {
+    companion object : Specification<GDMLPosition> {
         override fun wrap(config: Config) = GDMLPosition(config)
     }
 }
@@ -27,7 +27,7 @@ class GDMLRotation(config: Config) : GDMLDefine(config) {
     var z by number(0f).float
     var unit by string("deg")
 
-    companion object : SpecificationCompanion<GDMLRotation> {
+    companion object : Specification<GDMLRotation> {
         override fun wrap(config: Config) = GDMLRotation(config)
     }
 }
@@ -43,7 +43,7 @@ class GDMLBox(config: Config) : GDMLSolid(config) {
     var pDy by number().double
     var pDz by number().double
 
-    companion object : SpecificationCompanion<GDMLBox> {
+    companion object : Specification<GDMLBox> {
         override fun wrap(config: Config): GDMLBox = GDMLBox(config)
     }
 }
@@ -57,7 +57,7 @@ class GDMLTube(config: Config) : GDMLSolid(config) {
     var pSPhi by number().double
     var pDPhi by number().double
 
-    companion object : SpecificationCompanion<GDMLTube> {
+    companion object : Specification<GDMLTube> {
         override fun wrap(config: Config): GDMLTube = GDMLTube(config)
     }
 }
@@ -67,14 +67,14 @@ class GDMLXtru(config: Config) : GDMLSolid(config) {
 
     class TwoDimVertex(val x: Double, val y: Double)
 
-    class Section(override val config: Config) : Specification {
+    class Section(override val config: Config) : Specific {
         var zOrder by number().int
         var zPosition by number().double
         var xOffsset by number(0.0).double
         var yOffset by number(0.0).double
         var scalingFactor by number(1.0).double
 
-        companion object : SpecificationCompanion<Section> {
+        companion object : Specification<Section> {
             override fun wrap(config: Config): Section = Section(config)
         }
     }
@@ -96,7 +96,7 @@ class GDMLXtru(config: Config) : GDMLSolid(config) {
         config["section[$index]"] = Section.build(block).apply { zOrder = index; zPosition = z }
     }
 
-    companion object : SpecificationCompanion<GDMLXtru> {
+    companion object : Specification<GDMLXtru> {
         override fun wrap(config: Config): GDMLXtru = GDMLXtru(config)
     }
 }
@@ -160,7 +160,7 @@ sealed class GDMLBoolSolid(config: Config, var root: GDML? = null) : GDMLSolid(c
 class GDMLUnion(config: Config) : GDMLBoolSolid(config) {
     override val type: String = "union"
 
-    companion object : SpecificationCompanion<GDMLUnion> {
+    companion object : Specification<GDMLUnion> {
         override fun wrap(config: Config): GDMLUnion = GDMLUnion(config)
     }
 }
@@ -168,7 +168,7 @@ class GDMLUnion(config: Config) : GDMLBoolSolid(config) {
 class GDMLSubtraction(config: Config) : GDMLBoolSolid(config) {
     override val type: String = "subtraction"
 
-    companion object : SpecificationCompanion<GDMLUnion> {
+    companion object : Specification<GDMLUnion> {
         override fun wrap(config: Config) = GDMLUnion(config)
     }
 }
@@ -176,7 +176,7 @@ class GDMLSubtraction(config: Config) : GDMLBoolSolid(config) {
 class GDMLIntersection(config: Config) : GDMLBoolSolid(config) {
     override val type: String = "intersection"
 
-    companion object : SpecificationCompanion<GDMLIntersection> {
+    companion object : Specification<GDMLIntersection> {
         override fun wrap(config: Config) = GDMLIntersection(config)
     }
 }
\ No newline at end of file
diff --git a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLPlugin.kt b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLPlugin.kt
index 56bb72d4..6445755a 100644
--- a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLPlugin.kt
+++ b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/gdml/GDMLPlugin.kt
@@ -4,6 +4,7 @@ import hep.dataforge.context.AbstractPlugin
 import hep.dataforge.context.Context
 import hep.dataforge.context.PluginFactory
 import hep.dataforge.context.PluginTag
+import hep.dataforge.meta.Meta
 import hep.dataforge.names.toName
 import hep.dataforge.vis.spatial.ThreePlugin
 
@@ -30,6 +31,6 @@ class GDMLPlugin : AbstractPlugin() {
     companion object : PluginFactory<GDMLPlugin> {
         override val tag = PluginTag("vis.gdml", "hep.dataforge")
         override val type = GDMLPlugin::class
-        override fun invoke() = GDMLPlugin()
+        override fun invoke(meta: Meta) = GDMLPlugin()
     }
 }
\ No newline at end of file
diff --git a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/jsroot/JSRootPlugin.kt b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/jsroot/JSRootPlugin.kt
index 7a31f2bd..46bd0f24 100644
--- a/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/jsroot/JSRootPlugin.kt
+++ b/dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/jsroot/JSRootPlugin.kt
@@ -4,6 +4,7 @@ import hep.dataforge.context.AbstractPlugin
 import hep.dataforge.context.Context
 import hep.dataforge.context.PluginFactory
 import hep.dataforge.context.PluginTag
+import hep.dataforge.meta.Meta
 import hep.dataforge.names.toName
 import hep.dataforge.vis.spatial.ThreePlugin
 
@@ -31,6 +32,6 @@ class JSRootPlugin : AbstractPlugin() {
     companion object: PluginFactory<JSRootPlugin> {
         override val tag = PluginTag("vis.jsroot", "hep.dataforge")
         override val type = JSRootPlugin::class
-        override fun invoke() = JSRootPlugin()
+        override fun invoke(meta: Meta) = JSRootPlugin()
     }
 }
\ No newline at end of file