diff --git a/build.gradle.kts b/build.gradle.kts
index 3395cacc..f87fced4 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,9 +1,10 @@
 
 plugins {
-    val toolsVersion = "0.4.2"
+    val toolsVersion = "0.5.5"
     id("scientifik.mpp") version toolsVersion apply false
     id("scientifik.jvm") version toolsVersion apply false
     id("scientifik.publish") version toolsVersion apply false
+    id("org.jetbrains.dokka") version "0.10.1"
 }
 
 val dataforgeVersion by extra("0.1.8-dev-2")
@@ -22,4 +23,5 @@ allprojects {
 
 subprojects {
     apply(plugin = "scientifik.publish")
+    apply(plugin = "org.jetbrains.dokka")
 }
\ No newline at end of file
diff --git a/dataforge-context/build.gradle.kts b/dataforge-context/build.gradle.kts
index 261933fe..3c13042d 100644
--- a/dataforge-context/build.gradle.kts
+++ b/dataforge-context/build.gradle.kts
@@ -13,19 +13,19 @@ kotlin {
         val commonMain by getting {
             dependencies {
                 api(project(":dataforge-meta"))
-                api("io.github.microutils:kotlin-logging-common:1.7.8")
+                api("io.github.microutils:kotlin-logging-common:1.7.9")
             }
         }
         val jvmMain by getting {
             dependencies {
                 api(kotlin("reflect"))
-                api("io.github.microutils:kotlin-logging:1.7.8")
+                api("io.github.microutils:kotlin-logging:1.7.9")
                 api("ch.qos.logback:logback-classic:1.2.3")
             }
         }
         val jsMain by getting {
             dependencies {
-                api("io.github.microutils:kotlin-logging-js:1.7.8")
+                api("io.github.microutils:kotlin-logging-js:1.7.9")
             }
         }
     }
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 884c1c26..a078c37f 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Configurable.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Configurable.kt
@@ -50,6 +50,13 @@ interface Configurable : Described {
     }
 }
 
+/**
+ * Reset the property to its default value
+ */
+fun Configurable.resetProperty(name: Name) {
+    setProperty(name, null)
+}
+
 fun Configurable.getProperty(key: String) = getProperty(key.toName())
 
 fun Configurable.setProperty(name: Name, value: Value?) = setProperty(name, value?.let { MetaItem.ValueItem(value) })
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigurableDelegate.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigurableDelegate.kt
index 1999ced4..a94b3667 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigurableDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigurableDelegate.kt
@@ -201,8 +201,8 @@ fun Configurable.doubleArray(vararg doubles: Double, key: Name? = null): ReadWri
 
 /* Node delegates */
 
-fun Configurable.config(key: Name? = null): ReadWriteProperty<Any?, Config?> =
-    config.node(key)
+fun Configurable.config(default: Config? = null, key: Name? = null): ReadWriteProperty<Any?, Config?> =
+    config.node(default,key)
 
 fun Configurable.node(key: Name? = null): ReadWriteProperty<Any?, Meta?> = item(key).map(
     reader = { it.node },
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMetaDelegate.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMetaDelegate.kt
index 39a022f4..3230afbe 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMetaDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMetaDelegate.kt
@@ -84,8 +84,8 @@ fun <M : MutableMeta<M>> M.boolean(default: Boolean? = null, key: Name? = null):
 fun <M : MutableMeta<M>> M.number(default: Number? = null, key: Name? = null): ReadWriteProperty<Any?, Number?> =
     item(default, key).transform { it.number }
 
-inline fun <reified M : MutableMeta<M>> M.node(key: Name? = null) =
-    item(this, key).transform { it.node as? M }
+inline fun <reified M : MutableMeta<M>> M.node(default: M? = null, key: Name? = null) =
+    item(default, key = key).transform { it.node as? M }
 
 @JvmName("safeString")
 fun <M : MutableMeta<M>> M.string(default: String, key: Name? = null) =
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 a551b313..7f748ff2 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
@@ -47,10 +47,20 @@ fun ItemDescriptor.attributes(block: Config.() -> Unit) {
     (attributes ?: Config().also { this.attributes = it }).apply(block)
 }
 
+/**
+ * Set specific attribute in the descriptor
+ */
+fun ItemDescriptor.setAttribute(name: Name, value: Any?) {
+    attributes {
+        set(name, value)
+    }
+}
+
 /**
  * Check if given item suits the descriptor
  */
 fun ItemDescriptor.validateItem(item: MetaItem<*>?): Boolean {
+    if (item == null) return !required
     return when (this) {
         is ValueDescriptor -> isAllowedValue(item.value ?: return false)
         is NodeDescriptor -> items.all { (key, d) ->