diff --git a/build.gradle.kts b/build.gradle.kts
index 43ea9882..3395cacc 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
     id("scientifik.publish") version toolsVersion apply false
 }
 
-val dataforgeVersion by extra("0.1.8-dev-1")
+val dataforgeVersion by extra("0.1.8-dev-2")
 
 val bintrayRepo by extra("dataforge")
 val githubProject by extra("dataforge-core")
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Configurable.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Configurable.kt
index b38b7d95..884c1c26 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Configurable.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Configurable.kt
@@ -64,4 +64,5 @@ fun Configurable.setProperty(key: String, meta: Meta?) = setProperty(key, meta?.
 
 fun <T : Configurable> T.configure(meta: Meta): T = this.apply { config.update(meta) }
 
+@DFBuilder
 inline fun <T : Configurable> T.configure(action: Config.() -> Unit): T = apply { config.apply(action) }
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
index 3aa5b848..768ddbfa 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
@@ -173,8 +173,8 @@ interface MetaNode<out M : MetaNode<M>> : Meta {
 operator fun <M : MetaNode<M>> M?.get(name: Name): MetaItem<M>? = if( this == null) {
     null
 } else {
-    @Suppress("UNCHECKED_CAST")
-    (this as Meta).get(name) as MetaItem<M>?
+    @Suppress("UNCHECKED_CAST", "ReplaceGetOrSet")
+    (this as Meta).get(name) as MetaItem<M>? // Do not change
 }
 
 operator fun <M : MetaNode<M>> M?.get(key: String): MetaItem<M>? = this[key.toName()]
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
index bb280734..16fcf40d 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
@@ -76,11 +76,9 @@ inline fun MutableMeta<*>.remove(name: Name) = set(name, null)
 @Suppress("NOTHING_TO_INLINE")
 inline fun MutableMeta<*>.remove(name: String) = remove(name.toName())
 
-fun MutableMeta<*>.setValue(name: Name, value: Value) =
-    set(name, MetaItem.ValueItem(value))
+fun MutableMeta<*>.setValue(name: Name, value: Value) = set(name, MetaItem.ValueItem(value))
 
-fun MutableMeta<*>.setValue(name: String, value: Value) =
-    set(name.toName(), MetaItem.ValueItem(value))
+fun MutableMeta<*>.setValue(name: String, value: Value) = set(name.toName(), value)
 
 fun MutableMeta<*>.setItem(name: Name, item: MetaItem<*>?) {
     when (item) {
@@ -98,7 +96,7 @@ fun MutableMeta<*>.setNode(name: Name, node: Meta) =
 fun MutableMeta<*>.setNode(name: String, node: Meta) = setNode(name.toName(), node)
 
 /**
- * Universal set method
+ * Universal unsafe set method
  */
 operator fun MutableMeta<*>.set(name: Name, value: Any?) {
     when (value) {
@@ -173,4 +171,17 @@ fun <M : MutableMeta<M>> M.append(name: Name, value: Any?) {
     }
 }
 
-fun <M : MutableMeta<M>> M.append(name: String, value: Any?) = append(name.toName(), value)
\ No newline at end of file
+fun <M : MutableMeta<M>> M.append(name: String, value: Any?) = append(name.toName(), value)
+
+/**
+ * Apply existing node with given [builder] or create a new element with it.
+ */
+@DFExperimental
+fun <M : AbstractMutableMeta<M>> M.edit(name: Name, builder: M.() -> Unit) {
+    val item = when(val existingItem = get(name)){
+        null -> empty().also { set(name, it) }
+        is MetaItem.NodeItem<M> -> existingItem.node
+        else -> error("Can't edit value meta item")
+    }
+    item.apply(builder)
+}
\ No newline at end of file
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/descriptors/ItemDescriptor.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/descriptors/ItemDescriptor.kt
index 02af4374..a551b313 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/descriptors/ItemDescriptor.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/descriptors/ItemDescriptor.kt
@@ -24,19 +24,20 @@ sealed class ItemDescriptor(val config: Config) {
      */
     var info: String? by config.string()
 
-    /**
-     * Additional attributes of an item. For example validation and widget parameters
-     *
-     * @return
-     */
-    var attributes by config.node()
-
     /**
      * True if the item is required
      *
      * @return
      */
     abstract var required: Boolean
+
+
+    /**
+     * Additional attributes of an item. For example validation and widget parameters
+     *
+     * @return
+     */
+    var attributes by config.node()
 }
 
 /**
@@ -166,12 +167,12 @@ class NodeDescriptor(config: Config = Config()) : ItemDescriptor(config) {
         value(name.toName(), block)
     }
 
-    companion object{
+    companion object {
 
         val ITEM_KEY = "item".asName()
         val IS_NODE_KEY = "@isNode".asName()
 
-        inline operator fun invoke(block: NodeDescriptor.()->Unit) = NodeDescriptor().apply(block)
+        inline operator fun invoke(block: NodeDescriptor.() -> Unit) = NodeDescriptor().apply(block)
 
         //TODO infer descriptor from spec
     }
@@ -251,9 +252,9 @@ class ValueDescriptor(config: Config = Config()) : ItemDescriptor(config) {
      * @return
      */
     var allowedValues: List<Value> by config.value().transform {
-        when{
+        when {
             it?.list != null -> it.list
-            type.size == 1 && type[0] === ValueType.BOOLEAN ->    listOf(True, False)
+            type.size == 1 && type[0] === ValueType.BOOLEAN -> listOf(True, False)
             else -> emptyList()
         }
     }
@@ -264,4 +265,14 @@ class ValueDescriptor(config: Config = Config()) : ItemDescriptor(config) {
     fun allow(vararg v: Any) {
         this.allowedValues = v.map { Value.of(it) }
     }
+}
+
+/**
+ * Merge two node descriptors into one using first one as primary
+ */
+operator fun NodeDescriptor.plus(other: NodeDescriptor): NodeDescriptor {
+    return NodeDescriptor().apply {
+        config.update(other.config)
+        config.update(this@plus.config)
+    }
 }
\ No newline at end of file