diff --git a/build.gradle.kts b/build.gradle.kts
index 06d80994..a2a7f5b9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,9 +1,9 @@
 plugins {
-    id("scientifik.mpp") version "0.2.0" apply false
-    id("scientifik.publish") version "0.2.0" apply false
+    id("scientifik.mpp") version "0.2.1" apply false
+    id("scientifik.publish") version "0.2.1" apply false
 }
 
-val dataforgeVersion by extra("0.1.4-dev-4")
+val dataforgeVersion by extra("0.1.4-dev-5")
 
 val bintrayRepo by extra("dataforge")
 val githubProject by extra("dataforge-core")
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/descriptors/ItemDescriptor.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/descriptors/ItemDescriptor.kt
index 09e4d11e..0a25ff4d 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/descriptors/ItemDescriptor.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/descriptors/ItemDescriptor.kt
@@ -32,13 +32,11 @@ sealed class ItemDescriptor(override val config: Config) : Specific {
     var info: String? by string()
 
     /**
-     * A list of tags for this item. Tags used to customize item usage
+     * Additional attributes of an item. For example validation and widget parameters
      *
      * @return
      */
-    var tags: List<String> by value { value ->
-        value?.list?.map { it.string } ?: emptyList()
-    }
+    var attributes by node()
 
     /**
      * True if the item is required
@@ -54,7 +52,7 @@ sealed class ItemDescriptor(override val config: Config) : Specific {
  *
  * @author Alexander Nozik
  */
-class NodeDescriptor(config: Config) : ItemDescriptor(config){
+class NodeDescriptor(config: Config) : ItemDescriptor(config) {
 
     /**
      * True if the node is required
@@ -68,7 +66,7 @@ class NodeDescriptor(config: Config) : ItemDescriptor(config){
      *
      * @return
      */
-    var default: Meta? by node()
+    var default: Config? by node()
 
     /**
      * The list of value descriptors
@@ -79,7 +77,7 @@ class NodeDescriptor(config: Config) : ItemDescriptor(config){
         }
 
     fun value(name: String, descriptor: ValueDescriptor) {
-        if(items.keys.contains(name)) error("The key $name already exists in descriptor")
+        if (items.keys.contains(name)) error("The key $name already exists in descriptor")
         val token = NameToken(VALUE_KEY, name)
         config[token] = descriptor.config
     }
@@ -101,7 +99,7 @@ class NodeDescriptor(config: Config) : ItemDescriptor(config){
 
 
     fun node(name: String, descriptor: NodeDescriptor) {
-        if(items.keys.contains(name)) error("The key $name already exists in descriptor")
+        if (items.keys.contains(name)) error("The key $name already exists in descriptor")
         val token = NameToken(NODE_KEY, name)
         config[token] = descriptor.config
     }
@@ -117,7 +115,7 @@ class NodeDescriptor(config: Config) : ItemDescriptor(config){
 
     companion object : Specification<NodeDescriptor> {
 
-//        const val ITEM_KEY = "item"
+        //        const val ITEM_KEY = "item"
         const val NODE_KEY = "node"
         const val VALUE_KEY = "value"
 
@@ -135,7 +133,7 @@ class NodeDescriptor(config: Config) : ItemDescriptor(config){
  *
  * @author Alexander Nozik
  */
-class ValueDescriptor(config: Config) : ItemDescriptor(config){
+class ValueDescriptor(config: Config) : ItemDescriptor(config) {
 
 
     /**
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/configDelegates.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/configDelegates.kt
index 45b6b4d2..1dabd05b 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/configDelegates.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/configDelegates.kt
@@ -105,7 +105,7 @@ inline fun <reified E : Enum<E>> Configurable.enum(default: E, key: Name? = null
 
 /* Node delegates */
 
-fun Configurable.node(key: Name? = null) = MutableNodeDelegate(config, key)
+fun Configurable.node(key: Name? = null): MutableNodeDelegate<Config> = MutableNodeDelegate(config, key)
 
 fun <T : Specific> Configurable.spec(spec: Specification<T>, key: Name? = null) =
     MutableMorphDelegate(config, key) { spec.wrap(it) }
@@ -133,5 +133,5 @@ fun Configurable.doubleArray(key: Name? = null): ReadWriteDelegateWrapper<Value?
             ?: doubleArrayOf()
     }
 
-fun <T : Configurable> Configurable.child(key: Name? = null, converter: (Meta) -> T) =
+fun <T : Configurable> Configurable.node(key: Name? = null, converter: (Meta) -> T) =
     MutableMorphDelegate(config, key, converter)
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/metaDelegates.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/metaDelegates.kt
index e9c19864..6bed5413 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/metaDelegates.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/metaDelegates.kt
@@ -138,7 +138,7 @@ fun Meta.boolean(default: Boolean? = null, key: String? = null) = BooleanDelegat
 
 fun Meta.number(default: Number? = null, key: String? = null) = NumberDelegate(this, key, default)
 
-fun Meta.child(key: String? = null) = ChildDelegate(this, key) { it }
+fun Meta.node(key: String? = null) = ChildDelegate(this, key) { it }
 
 @JvmName("safeString")
 fun Meta.string(default: String, key: String? = null) =
@@ -169,7 +169,7 @@ inline fun <reified E : Enum<E>> Meta.enum(default: E, key: String? = null) =
     SafeEnumDelegate(this, key, default) { enumValueOf(it) }
 
 
-fun <T : Metoid> Metoid.child(key: String? = null, converter: (Meta) -> T) = ChildDelegate(meta, key, converter)
+fun <T : Metoid> Metoid.node(key: String? = null, converter: (Meta) -> T) = ChildDelegate(meta, key, converter)
 
 /* Read-write delegates */
 
@@ -337,12 +337,12 @@ class MutableSafeEnumvDelegate<M : MutableMeta<M>, E : Enum<E>>(
 class MutableNodeDelegate<M : MutableMeta<M>>(
     val meta: M,
     private val key: Name? = null
-) : ReadWriteProperty<Any?, Meta?> {
-    override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? {
+) : ReadWriteProperty<Any?, M?> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): M? {
         return meta[key ?: property.name.asName()]?.node
     }
 
-    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Meta?) {
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: M?) {
         meta[key ?: property.name.asName()] = value
     }
 }
diff --git a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/GenericTask.kt b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/GenericTask.kt
index f59c3d24..ff499888 100644
--- a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/GenericTask.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/GenericTask.kt
@@ -19,20 +19,20 @@ class GenericTask<R : Any>(
     private val dataTransform: Workspace.() -> TaskModel.(DataNode<Any>) -> DataNode<R>
 ) : Task<R> {
 
-    private fun gather(workspace: Workspace, model: TaskModel): DataNode<Any> {
-        return DataNode.invoke(Any::class) {
-            model.dependencies.forEach { dep ->
-                update(dep.apply(workspace))
-            }
-        }
-    }
+//    private fun gather(workspace: Workspace, model: TaskModel): DataNode<Any> {
+//        return DataNode.invoke(Any::class) {
+//            model.dependencies.forEach { dep ->
+//                update(dep.apply(workspace))
+//            }
+//        }
+//    }
 
     override fun run(workspace: Workspace, model: TaskModel): DataNode<R> {
         //validate model
         validate(model)
 
         // gather data
-        val input = gather(workspace, model)
+        val input = model.buildInput(workspace)// gather(workspace, model)
 
         //execute
         workspace.context.logger.info{"Starting task '$name' on ${model.target} with meta: \n${model.meta}"}
diff --git a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt
index 7f9cd976..f71f01a0 100644
--- a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt
@@ -8,7 +8,6 @@ package hep.dataforge.workspace
 import hep.dataforge.data.DataFilter
 import hep.dataforge.data.DataTree
 import hep.dataforge.data.DataTreeBuilder
-import hep.dataforge.data.dataSequence
 import hep.dataforge.meta.*
 import hep.dataforge.names.EmptyName
 import hep.dataforge.names.Name
@@ -53,9 +52,8 @@ data class TaskModel(
  */
 fun TaskModel.buildInput(workspace: Workspace): DataTree<Any> {
     return DataTreeBuilder(Any::class).apply {
-        dependencies.asSequence().flatMap { it.apply(workspace).dataSequence() }.forEach { (name, data) ->
-            //TODO add concise error on replacement
-            this[name] = data
+        dependencies.forEach { dep ->
+            update(dep.apply(workspace))
         }
     }.build()
 }
diff --git a/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt b/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt
index f45f8720..3059cb29 100644
--- a/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt
+++ b/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt
@@ -35,6 +35,14 @@ class SimpleWorkspaceTest {
             }
         }
 
+        val filterTask = task<Int>("filterOne") {
+            model {
+                data("myData\\[12\\]")
+            }
+            pipe<Int>{
+                it
+            }
+        }
 
         val square = task<Int>("square") {
             pipe<Int> { data ->
@@ -150,4 +158,10 @@ class SimpleWorkspaceTest {
         val node = workspace.run("fullsquare")
         println(node.toMeta())
     }
+
+    @Test
+    fun testGather() {
+        val node = workspace.run("filterOne")
+        assertEquals(12, node.first()?.get())
+    }
 }
\ No newline at end of file