diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4469f802..b9d3b6a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,27 +3,42 @@
 ## Unreleased
 
 ### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## 0.8.0 - 2024-02-03
+
+### Added
+
 - Wasm artifacts
 - Add automatic MetaConverter for serializeable objects
 - Add Meta and MutableMeta delegates for convertable and serializeable
 - Meta mapping for data.
 
 ### Changed
+
 - Descriptor `children` renamed to `nodes`
 - `MetaConverter` now inherits `MetaSpec` (former `Specifiction`). So `MetaConverter` could be used more universally.
 - Meta copy and modification now use lightweight non-observable meta builders.
+- Full refactor of Data API. DataTree now works similar to Meta: contains optional anonymous root element and data items. Updates are available for `ObservaleDataSource` and `ObservableDataTree` variants.
 
 ### Deprecated
+
 - `node(key,converter)` in favor of `serializable` delegate
 
-### Removed
-
 ### Fixed
+
 - Partially fixed a bug with `MutableMeta` observable wrappers.
 - `valueSequence` now include root value. So `meta.update` works properly.
 
-### Security
-
 ## 0.7.0 - 2023-11-26
 
 ### Added
diff --git a/build.gradle.kts b/build.gradle.kts
index 4a336e25..b9349868 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.8.0-dev-1"
+    version = "0.8.0"
 }
 
 subprojects {
diff --git a/dataforge-context/README.md b/dataforge-context/README.md
index 905171b1..f0aff459 100644
--- a/dataforge-context/README.md
+++ b/dataforge-context/README.md
@@ -6,18 +6,16 @@ Context and provider definitions
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-context:0.7.0`.
+The Maven coordinates of this project are `space.kscience:dataforge-context:0.8.0`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
-    //uncomment to access development builds
-    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-context:0.7.0")
+    implementation("space.kscience:dataforge-context:0.8.0")
 }
 ```
diff --git a/dataforge-context/api/dataforge-context.api b/dataforge-context/api/dataforge-context.api
index eac8e52c..12bca176 100644
--- a/dataforge-context/api/dataforge-context.api
+++ b/dataforge-context/api/dataforge-context.api
@@ -249,10 +249,27 @@ public final class space/kscience/dataforge/context/SlfLogManager$Companion : sp
 	public fun getTag ()Lspace/kscience/dataforge/context/PluginTag;
 }
 
-public final class space/kscience/dataforge/properties/PropertyKt {
+public abstract interface annotation class space/kscience/dataforge/descriptors/Description : java/lang/annotation/Annotation {
+	public abstract fun value ()Ljava/lang/String;
 }
 
-public final class space/kscience/dataforge/properties/SchemePropertyKt {
+public abstract interface annotation class space/kscience/dataforge/descriptors/DescriptorResource : java/lang/annotation/Annotation {
+	public abstract fun resourceName ()Ljava/lang/String;
+}
+
+public abstract interface annotation class space/kscience/dataforge/descriptors/DescriptorUrl : java/lang/annotation/Annotation {
+	public abstract fun url ()Ljava/lang/String;
+}
+
+public abstract interface annotation class space/kscience/dataforge/descriptors/Multiple : java/lang/annotation/Annotation {
+}
+
+public final class space/kscience/dataforge/descriptors/ReflectiveDescriptorsKt {
+	public static final fun forClass (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion;Lkotlin/reflect/KClass;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public static synthetic fun forClass$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion;Lkotlin/reflect/KClass;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+}
+
+public final class space/kscience/dataforge/properties/MetaAsFlowKt {
 }
 
 public final class space/kscience/dataforge/provider/DfTypeKt {
diff --git a/dataforge-data/README.md b/dataforge-data/README.md
index 5935af6e..d77ed1b9 100644
--- a/dataforge-data/README.md
+++ b/dataforge-data/README.md
@@ -6,18 +6,16 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-data:0.7.0`.
+The Maven coordinates of this project are `space.kscience:dataforge-data:0.8.0`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
-    //uncomment to access development builds
-    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-data:0.7.0")
+    implementation("space.kscience:dataforge-data:0.8.0")
 }
 ```
diff --git a/dataforge-data/build.gradle.kts b/dataforge-data/build.gradle.kts
index ea542290..99314ea3 100644
--- a/dataforge-data/build.gradle.kts
+++ b/dataforge-data/build.gradle.kts
@@ -11,6 +11,7 @@ kscience{
     dependencies {
         api(spclibs.atomicfu)
         api(projects.dataforgeMeta)
+        //Remove after subtype moved to stdlib
         api(kotlin("reflect"))
     }
 }
diff --git a/dataforge-io/README.md b/dataforge-io/README.md
index ec431a04..85e49e5a 100644
--- a/dataforge-io/README.md
+++ b/dataforge-io/README.md
@@ -6,18 +6,16 @@ IO module
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-io:0.7.0`.
+The Maven coordinates of this project are `space.kscience:dataforge-io:0.8.0`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
-    //uncomment to access development builds
-    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-io:0.7.0")
+    implementation("space.kscience:dataforge-io:0.8.0")
 }
 ```
diff --git a/dataforge-io/dataforge-io-yaml/README.md b/dataforge-io/dataforge-io-yaml/README.md
index 06a0efb4..20f5b4f6 100644
--- a/dataforge-io/dataforge-io-yaml/README.md
+++ b/dataforge-io/dataforge-io-yaml/README.md
@@ -6,18 +6,16 @@ YAML meta IO
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.7.0`.
+The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.8.0`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
-    //uncomment to access development builds
-    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-io-yaml:0.7.0")
+    implementation("space.kscience:dataforge-io-yaml:0.8.0")
 }
 ```
diff --git a/dataforge-meta/README.md b/dataforge-meta/README.md
index 5f214640..bd11ebf1 100644
--- a/dataforge-meta/README.md
+++ b/dataforge-meta/README.md
@@ -6,18 +6,16 @@ Meta definition and basic operations on meta
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-meta:0.7.0`.
+The Maven coordinates of this project are `space.kscience:dataforge-meta:0.8.0`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
-    //uncomment to access development builds
-    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-meta:0.7.0")
+    implementation("space.kscience:dataforge-meta:0.8.0")
 }
 ```
diff --git a/dataforge-meta/api/dataforge-meta.api b/dataforge-meta/api/dataforge-meta.api
index 1700ca7d..7564da80 100644
--- a/dataforge-meta/api/dataforge-meta.api
+++ b/dataforge-meta/api/dataforge-meta.api
@@ -56,6 +56,20 @@ public final class space/kscience/dataforge/meta/JsonMetaKt {
 	public static final fun toValue (Lkotlinx/serialization/json/JsonPrimitive;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/Value;
 }
 
+public final class space/kscience/dataforge/meta/KeepTransformationRule : space/kscience/dataforge/meta/TransformationRule {
+	public fun <init> (Lkotlin/jvm/functions/Function1;)V
+	public final fun component1 ()Lkotlin/jvm/functions/Function1;
+	public final fun copy (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/KeepTransformationRule;
+	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/KeepTransformationRule;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/KeepTransformationRule;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getSelector ()Lkotlin/jvm/functions/Function1;
+	public fun hashCode ()I
+	public fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
+	public fun selectItems (Lspace/kscience/dataforge/meta/Meta;)Lkotlin/sequences/Sequence;
+	public fun toString ()Ljava/lang/String;
+	public fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
+}
+
 public final class space/kscience/dataforge/meta/Laminate : space/kscience/dataforge/meta/TypedMeta {
 	public static final field Companion Lspace/kscience/dataforge/meta/Laminate$Companion;
 	public fun equals (Ljava/lang/Object;)Z
@@ -159,6 +173,32 @@ public final class space/kscience/dataforge/meta/MetaBuilder : space/kscience/da
 public abstract interface annotation class space/kscience/dataforge/meta/MetaBuilderMarker : java/lang/annotation/Annotation {
 }
 
+public abstract interface class space/kscience/dataforge/meta/MetaConverter : space/kscience/dataforge/meta/MetaSpec {
+	public static final field Companion Lspace/kscience/dataforge/meta/MetaConverter$Companion;
+	public abstract fun convert (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
+	public fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public abstract fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+}
+
+public final class space/kscience/dataforge/meta/MetaConverter$Companion {
+	public final fun getBoolean ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getDouble ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getFloat ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getInt ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getLong ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getMeta ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getNumber ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getString ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun getValue ()Lspace/kscience/dataforge/meta/MetaConverter;
+	public final fun valueList (Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/MetaConverter;
+	public static synthetic fun valueList$default (Lspace/kscience/dataforge/meta/MetaConverter$Companion;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaConverter;
+}
+
+public final class space/kscience/dataforge/meta/MetaConverterKt {
+	public static final fun convertNullable (Lspace/kscience/dataforge/meta/MetaConverter;Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
+}
+
 public final class space/kscience/dataforge/meta/MetaDelegateKt {
 	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadOnlyProperty;
@@ -178,20 +218,24 @@ public final class space/kscience/dataforge/meta/MetaDelegateKt {
 	public static final fun int (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun listOfSpec (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun listOfSpec$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/transformations/MetaConverter;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/transformations/MetaConverter;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun spec (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadOnlyProperty;
@@ -252,6 +296,47 @@ public final class space/kscience/dataforge/meta/MetaSerializer : kotlinx/serial
 	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/Meta;)V
 }
 
+public abstract interface class space/kscience/dataforge/meta/MetaSpec : space/kscience/dataforge/meta/descriptors/Described {
+	public fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public abstract fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+}
+
+public final class space/kscience/dataforge/meta/MetaSpecKt {
+	public static final fun readNullable (Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public static final fun readValue (Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/meta/Value;)Ljava/lang/Object;
+}
+
+public final class space/kscience/dataforge/meta/MetaTransformation {
+	public static final field Companion Lspace/kscience/dataforge/meta/MetaTransformation$Companion;
+	public static final fun apply-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Meta;
+	public static final fun bind-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/ObservableMeta;Lspace/kscience/dataforge/meta/MutableMeta;)V
+	public static final synthetic fun box-impl (Ljava/util/Collection;)Lspace/kscience/dataforge/meta/MetaTransformation;
+	public static fun constructor-impl (Ljava/util/Collection;)Ljava/util/Collection;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Ljava/util/Collection;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Ljava/util/Collection;Ljava/util/Collection;)Z
+	public static final fun generate-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Meta;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Ljava/util/Collection;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Ljava/util/Collection;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Ljava/util/Collection;
+}
+
+public final class space/kscience/dataforge/meta/MetaTransformation$Companion {
+	public final fun make--mWxz5M (Lkotlin/jvm/functions/Function1;)Ljava/util/Collection;
+}
+
+public final class space/kscience/dataforge/meta/MetaTransformationBuilder {
+	public fun <init> ()V
+	public final fun build-m6Fha10 ()Ljava/util/Collection;
+	public final fun keep (Ljava/lang/String;)V
+	public final fun keep (Lkotlin/jvm/functions/Function1;)V
+	public final fun keep (Lspace/kscience/dataforge/names/Name;)V
+	public final fun move (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;)V
+	public static synthetic fun move$default (Lspace/kscience/dataforge/meta/MetaTransformationBuilder;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)V
+}
+
 public abstract interface class space/kscience/dataforge/meta/MutableMeta : space/kscience/dataforge/meta/Meta, space/kscience/dataforge/meta/MutableMetaProvider {
 	public static final field Companion Lspace/kscience/dataforge/meta/MutableMeta$Companion;
 	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
@@ -293,6 +378,8 @@ public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
 	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;ZLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun convertable (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun convertable$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun double (Lspace/kscience/dataforge/meta/MutableMetaProvider;DLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun double (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
@@ -307,6 +394,8 @@ public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
 	public static final fun int (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun listOfConvertable (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun listOfConvertable$default (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun listValue (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun listValue$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun long (Lspace/kscience/dataforge/meta/MutableMetaProvider;JLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
@@ -314,9 +403,9 @@ public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
 	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;JLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun node (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun node (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/transformations/MetaConverter;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun node (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaConverter;)Lkotlin/properties/ReadWriteProperty;
 	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/transformations/MetaConverter;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaConverter;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadWriteProperty;
@@ -365,7 +454,7 @@ public final class space/kscience/dataforge/meta/MutableMetaKt {
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableValueProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 	public static final fun setIndexed (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Ljava/lang/Iterable;Lkotlin/jvm/functions/Function2;)V
 	public static synthetic fun setIndexed$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Ljava/lang/Iterable;Lkotlin/jvm/functions/Function2;ILjava/lang/Object;)V
-	public static final fun toMutableMeta (Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public static final fun toMutableMeta (Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/MutableMeta;
 	public static final fun update (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun withDefault (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/MetaProvider;)Lspace/kscience/dataforge/meta/MutableMeta;
 }
@@ -419,11 +508,6 @@ public abstract interface class space/kscience/dataforge/meta/ObservableMeta : s
 	public abstract fun removeListener (Ljava/lang/Object;)V
 }
 
-public final class space/kscience/dataforge/meta/ObservableMetaKt {
-	public static final fun useProperty (Lspace/kscience/dataforge/meta/Scheme;Lkotlin/reflect/KProperty1;Ljava/lang/Object;Lkotlin/jvm/functions/Function2;)V
-	public static synthetic fun useProperty$default (Lspace/kscience/dataforge/meta/Scheme;Lkotlin/reflect/KProperty1;Ljava/lang/Object;Lkotlin/jvm/functions/Function2;ILjava/lang/Object;)V
-}
-
 public final class space/kscience/dataforge/meta/ObservableMetaWrapperKt {
 	public static final fun asObservable (Lspace/kscience/dataforge/meta/MutableMeta;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
 }
@@ -437,10 +521,19 @@ public abstract interface class space/kscience/dataforge/meta/ObservableMutableM
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
 }
 
-public abstract interface class space/kscience/dataforge/meta/ReadOnlySpecification : space/kscience/dataforge/meta/descriptors/Described {
-	public abstract fun empty ()Ljava/lang/Object;
-	public fun invoke (Lkotlin/jvm/functions/Function1;)Ljava/lang/Object;
-	public abstract fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+public final class space/kscience/dataforge/meta/RegexItemTransformationRule : space/kscience/dataforge/meta/TransformationRule {
+	public fun <init> (Lkotlin/text/Regex;Lkotlin/jvm/functions/Function4;)V
+	public final fun component1 ()Lkotlin/text/Regex;
+	public final fun component2 ()Lkotlin/jvm/functions/Function4;
+	public final fun copy (Lkotlin/text/Regex;Lkotlin/jvm/functions/Function4;)Lspace/kscience/dataforge/meta/RegexItemTransformationRule;
+	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/RegexItemTransformationRule;Lkotlin/text/Regex;Lkotlin/jvm/functions/Function4;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/RegexItemTransformationRule;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getFrom ()Lkotlin/text/Regex;
+	public final fun getTransform ()Lkotlin/jvm/functions/Function4;
+	public fun hashCode ()I
+	public fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
+	public fun toString ()Ljava/lang/String;
+	public fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
 }
 
 public class space/kscience/dataforge/meta/Scheme : space/kscience/dataforge/meta/Configurable, space/kscience/dataforge/meta/MetaRepr, space/kscience/dataforge/meta/MutableMetaProvider, space/kscience/dataforge/meta/descriptors/Described {
@@ -454,6 +547,7 @@ public class space/kscience/dataforge/meta/Scheme : space/kscience/dataforge/met
 	public fun setValue (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Laminate;
 	public synthetic fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
+	public fun toString ()Ljava/lang/String;
 	public fun validate (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
 }
 
@@ -461,20 +555,30 @@ public final class space/kscience/dataforge/meta/SchemeKt {
 	public static final fun copy (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/SchemeSpec;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/Scheme;
 	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/SchemeSpec;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/Scheme;
 	public static final fun invoke (Lspace/kscience/dataforge/meta/Scheme;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/Scheme;
-	public static final fun retarget (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/MutableMeta;)Lspace/kscience/dataforge/meta/Scheme;
+	public static final fun scheme (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun scheme (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun scheme$default (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun scheme$default (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun schemeOrNull (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun schemeOrNull (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun schemeOrNull$default (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun schemeOrNull$default (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/SchemeSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun updateWith (Lspace/kscience/dataforge/meta/Configurable;Lspace/kscience/dataforge/meta/SchemeSpec;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/Scheme;
+	public static final fun updateWith (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/SchemeSpec;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/Scheme;
+	public static final fun useProperty (Lspace/kscience/dataforge/meta/Scheme;Lkotlin/reflect/KProperty1;Ljava/lang/Object;Lkotlin/jvm/functions/Function2;)V
+	public static synthetic fun useProperty$default (Lspace/kscience/dataforge/meta/Scheme;Lkotlin/reflect/KProperty1;Ljava/lang/Object;Lkotlin/jvm/functions/Function2;ILjava/lang/Object;)V
 }
 
-public class space/kscience/dataforge/meta/SchemeSpec : space/kscience/dataforge/meta/Specification {
+public class space/kscience/dataforge/meta/SchemeSpec : space/kscience/dataforge/meta/MetaConverter {
 	public fun <init> (Lkotlin/jvm/functions/Function0;)V
-	public synthetic fun empty ()Ljava/lang/Object;
-	public fun empty ()Lspace/kscience/dataforge/meta/Scheme;
+	public synthetic fun convert (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
+	public fun convert (Lspace/kscience/dataforge/meta/Scheme;)Lspace/kscience/dataforge/meta/Meta;
+	public final fun empty ()Lspace/kscience/dataforge/meta/Scheme;
 	public fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public synthetic fun invoke (Lkotlin/jvm/functions/Function1;)Ljava/lang/Object;
 	public final fun invoke (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/Scheme;
-	public synthetic fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public fun read (Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Scheme;
-	public synthetic fun write (Lspace/kscience/dataforge/meta/MutableMeta;)Ljava/lang/Object;
-	public fun write (Lspace/kscience/dataforge/meta/MutableMeta;)Lspace/kscience/dataforge/meta/Scheme;
+	public synthetic fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Scheme;
+	public final fun write (Lspace/kscience/dataforge/meta/MutableMeta;)Lspace/kscience/dataforge/meta/Scheme;
 }
 
 public final class space/kscience/dataforge/meta/SealedMeta : space/kscience/dataforge/meta/TypedMeta {
@@ -515,21 +619,20 @@ public final class space/kscience/dataforge/meta/SealedMetaKt {
 	public static final fun seal (Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/SealedMeta;
 }
 
-public abstract interface class space/kscience/dataforge/meta/Specification : space/kscience/dataforge/meta/ReadOnlySpecification {
-	public abstract fun write (Lspace/kscience/dataforge/meta/MutableMeta;)Ljava/lang/Object;
-}
-
-public final class space/kscience/dataforge/meta/SpecificationKt {
-	public static final fun spec (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun spec (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun specOrNull (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun specOrNull (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun specOrNull$default (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun specOrNull$default (Lspace/kscience/dataforge/meta/Scheme;Lspace/kscience/dataforge/meta/Specification;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun updateWith (Lspace/kscience/dataforge/meta/Configurable;Lspace/kscience/dataforge/meta/Specification;Lkotlin/jvm/functions/Function1;)Ljava/lang/Object;
-	public static final fun updateWith (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/Specification;Lkotlin/jvm/functions/Function1;)Ljava/lang/Object;
+public final class space/kscience/dataforge/meta/SingleItemTransformationRule : space/kscience/dataforge/meta/TransformationRule {
+	public fun <init> (Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function3;)V
+	public final fun component1 ()Lspace/kscience/dataforge/names/Name;
+	public final fun component2 ()Lkotlin/jvm/functions/Function3;
+	public final fun copy (Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function3;)Lspace/kscience/dataforge/meta/SingleItemTransformationRule;
+	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/SingleItemTransformationRule;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function3;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/SingleItemTransformationRule;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getFrom ()Lspace/kscience/dataforge/names/Name;
+	public final fun getTransform ()Lkotlin/jvm/functions/Function3;
+	public fun hashCode ()I
+	public fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
+	public fun selectItems (Lspace/kscience/dataforge/meta/Meta;)Lkotlin/sequences/Sequence;
+	public fun toString ()Ljava/lang/String;
+	public fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
 }
 
 public final class space/kscience/dataforge/meta/StringValue : space/kscience/dataforge/meta/Value {
@@ -550,6 +653,12 @@ public final class space/kscience/dataforge/meta/StringValue : space/kscience/da
 	public final synthetic fun unbox-impl ()Ljava/lang/String;
 }
 
+public abstract interface class space/kscience/dataforge/meta/TransformationRule {
+	public abstract fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
+	public fun selectItems (Lspace/kscience/dataforge/meta/Meta;)Lkotlin/sequences/Sequence;
+	public abstract fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
+}
+
 public final class space/kscience/dataforge/meta/True : space/kscience/dataforge/meta/Value {
 	public static final field INSTANCE Lspace/kscience/dataforge/meta/True;
 	public fun equals (Ljava/lang/Object;)Z
@@ -692,6 +801,7 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor {
 	public final fun getDescription ()Ljava/lang/String;
 	public final fun getIndexKey ()Ljava/lang/String;
 	public final fun getMultiple ()Z
+	public final fun getNodes ()Ljava/util/Map;
 	public final fun getValueRestriction ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun getValueTypes ()Ljava/util/List;
 	public fun hashCode ()I
@@ -720,6 +830,7 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun attributes (Lkotlin/jvm/functions/Function1;)V
 	public final fun build ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public final fun default (Ljava/lang/Object;)V
+	public final fun from (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
 	public final fun getAllowedValues ()Ljava/util/List;
 	public final fun getAttributes ()Lspace/kscience/dataforge/meta/MutableMeta;
 	public final fun getChildren ()Ljava/util/Map;
@@ -730,10 +841,6 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun getMultiple ()Z
 	public final fun getValueRestriction ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun getValueTypes ()Ljava/util/List;
-	public final fun item (Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
-	public static synthetic fun item$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
-	public final fun node (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
 	public final fun setAllowedValues (Ljava/util/List;)V
 	public final fun setAttributes (Lspace/kscience/dataforge/meta/MutableMeta;)V
 	public final fun setChildren (Ljava/util/Map;)V
@@ -751,16 +858,16 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public static final fun MetaDescriptor (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public static final fun copy (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public static final fun item (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
 	public static final fun node (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lkotlin/jvm/functions/Function1;)V
 	public static final fun node (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lspace/kscience/dataforge/meta/descriptors/Described;Lkotlin/jvm/functions/Function1;)V
-	public static final fun node (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
+	public static final fun node (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
+	public static final fun node (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;)V
 	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lspace/kscience/dataforge/meta/descriptors/Described;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)V
 	public static final fun required (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;)V
-	public static final fun value (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
-	public static final fun value (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
-	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
-	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
+	public static final fun value (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;)V
+	public static final fun value (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;)V
+	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Ljava/lang/String;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)V
+	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)V
 }
 
 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorKt {
@@ -781,117 +888,6 @@ public final class space/kscience/dataforge/meta/descriptors/ValueRestriction :
 	public static fun values ()[Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 }
 
-public final class space/kscience/dataforge/meta/transformations/KeepTransformationRule : space/kscience/dataforge/meta/transformations/TransformationRule {
-	public fun <init> (Lkotlin/jvm/functions/Function1;)V
-	public final fun component1 ()Lkotlin/jvm/functions/Function1;
-	public final fun copy (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/transformations/KeepTransformationRule;
-	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/transformations/KeepTransformationRule;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/transformations/KeepTransformationRule;
-	public fun equals (Ljava/lang/Object;)Z
-	public final fun getSelector ()Lkotlin/jvm/functions/Function1;
-	public fun hashCode ()I
-	public fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
-	public fun selectItems (Lspace/kscience/dataforge/meta/Meta;)Lkotlin/sequences/Sequence;
-	public fun toString ()Ljava/lang/String;
-	public fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
-}
-
-public abstract interface class space/kscience/dataforge/meta/transformations/MetaConverter {
-	public static final field Companion Lspace/kscience/dataforge/meta/transformations/MetaConverter$Companion;
-	public fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public abstract fun getType ()Lkotlin/reflect/KType;
-	public fun metaToObject (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public abstract fun metaToObjectOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public abstract fun objectToMeta (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
-}
-
-public final class space/kscience/dataforge/meta/transformations/MetaConverter$Companion {
-	public final fun getBoolean ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getDouble ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getFloat ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getInt ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getLong ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getMeta ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getNumber ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getString ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun getValue ()Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public final fun valueList (Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-	public static synthetic fun valueList$default (Lspace/kscience/dataforge/meta/transformations/MetaConverter$Companion;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/transformations/MetaConverter;
-}
-
-public final class space/kscience/dataforge/meta/transformations/MetaConverterKt {
-	public static final fun nullableMetaToObject (Lspace/kscience/dataforge/meta/transformations/MetaConverter;Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public static final fun nullableObjectToMeta (Lspace/kscience/dataforge/meta/transformations/MetaConverter;Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
-	public static final fun valueToObject (Lspace/kscience/dataforge/meta/transformations/MetaConverter;Lspace/kscience/dataforge/meta/Value;)Ljava/lang/Object;
-}
-
-public final class space/kscience/dataforge/meta/transformations/MetaTransformation {
-	public static final field Companion Lspace/kscience/dataforge/meta/transformations/MetaTransformation$Companion;
-	public static final fun apply-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Meta;
-	public static final fun bind-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/ObservableMeta;Lspace/kscience/dataforge/meta/MutableMeta;)V
-	public static final synthetic fun box-impl (Ljava/util/Collection;)Lspace/kscience/dataforge/meta/transformations/MetaTransformation;
-	public static fun constructor-impl (Ljava/util/Collection;)Ljava/util/Collection;
-	public fun equals (Ljava/lang/Object;)Z
-	public static fun equals-impl (Ljava/util/Collection;Ljava/lang/Object;)Z
-	public static final fun equals-impl0 (Ljava/util/Collection;Ljava/util/Collection;)Z
-	public static final fun generate-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Meta;
-	public fun hashCode ()I
-	public static fun hashCode-impl (Ljava/util/Collection;)I
-	public fun toString ()Ljava/lang/String;
-	public static fun toString-impl (Ljava/util/Collection;)Ljava/lang/String;
-	public final synthetic fun unbox-impl ()Ljava/util/Collection;
-}
-
-public final class space/kscience/dataforge/meta/transformations/MetaTransformation$Companion {
-	public final fun make-XNaMui4 (Lkotlin/jvm/functions/Function1;)Ljava/util/Collection;
-}
-
-public final class space/kscience/dataforge/meta/transformations/MetaTransformationBuilder {
-	public fun <init> ()V
-	public final fun build-050menU ()Ljava/util/Collection;
-	public final fun keep (Ljava/lang/String;)V
-	public final fun keep (Lkotlin/jvm/functions/Function1;)V
-	public final fun keep (Lspace/kscience/dataforge/names/Name;)V
-	public final fun move (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;)V
-	public static synthetic fun move$default (Lspace/kscience/dataforge/meta/transformations/MetaTransformationBuilder;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)V
-}
-
-public final class space/kscience/dataforge/meta/transformations/RegexItemTransformationRule : space/kscience/dataforge/meta/transformations/TransformationRule {
-	public fun <init> (Lkotlin/text/Regex;Lkotlin/jvm/functions/Function4;)V
-	public final fun component1 ()Lkotlin/text/Regex;
-	public final fun component2 ()Lkotlin/jvm/functions/Function4;
-	public final fun copy (Lkotlin/text/Regex;Lkotlin/jvm/functions/Function4;)Lspace/kscience/dataforge/meta/transformations/RegexItemTransformationRule;
-	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/transformations/RegexItemTransformationRule;Lkotlin/text/Regex;Lkotlin/jvm/functions/Function4;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/transformations/RegexItemTransformationRule;
-	public fun equals (Ljava/lang/Object;)Z
-	public final fun getFrom ()Lkotlin/text/Regex;
-	public final fun getTransform ()Lkotlin/jvm/functions/Function4;
-	public fun hashCode ()I
-	public fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
-	public fun toString ()Ljava/lang/String;
-	public fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
-}
-
-public final class space/kscience/dataforge/meta/transformations/SingleItemTransformationRule : space/kscience/dataforge/meta/transformations/TransformationRule {
-	public fun <init> (Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function3;)V
-	public final fun component1 ()Lspace/kscience/dataforge/names/Name;
-	public final fun component2 ()Lkotlin/jvm/functions/Function3;
-	public final fun copy (Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function3;)Lspace/kscience/dataforge/meta/transformations/SingleItemTransformationRule;
-	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/transformations/SingleItemTransformationRule;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function3;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/transformations/SingleItemTransformationRule;
-	public fun equals (Ljava/lang/Object;)Z
-	public final fun getFrom ()Lspace/kscience/dataforge/names/Name;
-	public final fun getTransform ()Lkotlin/jvm/functions/Function3;
-	public fun hashCode ()I
-	public fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
-	public fun selectItems (Lspace/kscience/dataforge/meta/Meta;)Lkotlin/sequences/Sequence;
-	public fun toString ()Ljava/lang/String;
-	public fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
-}
-
-public abstract interface class space/kscience/dataforge/meta/transformations/TransformationRule {
-	public abstract fun matches (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)Z
-	public fun selectItems (Lspace/kscience/dataforge/meta/Meta;)Lkotlin/sequences/Sequence;
-	public abstract fun transformItem (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MutableMeta;)V
-}
-
 public final class space/kscience/dataforge/misc/CastJvmKt {
 	public static final fun unsafeCast (Ljava/lang/Object;)Ljava/lang/Object;
 }
@@ -972,6 +968,7 @@ public final class space/kscience/dataforge/names/NameKt {
 	public static final fun startsWith (Lspace/kscience/dataforge/names/Name;Ljava/lang/String;)Z
 	public static final fun startsWith (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/names/Name;)Z
 	public static final fun startsWith (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/names/NameToken;)Z
+	public static final fun toStringUnescaped (Lspace/kscience/dataforge/names/Name;)Ljava/lang/String;
 	public static final fun withIndex (Lspace/kscience/dataforge/names/Name;Ljava/lang/String;)Lspace/kscience/dataforge/names/Name;
 }
 
diff --git a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptor.kt b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptor.kt
index 12bbd5d4..45954985 100644
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptor.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptor.kt
@@ -7,6 +7,7 @@ import space.kscience.dataforge.names.*
 /**
  * Restrictions on value in the node
  */
+@Serializable
 public enum class ValueRestriction {
     /**
      * No restrictions
diff --git a/dataforge-scripting/README.md b/dataforge-scripting/README.md
index af79cc8f..fbc5cb69 100644
--- a/dataforge-scripting/README.md
+++ b/dataforge-scripting/README.md
@@ -6,18 +6,16 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.7.0`.
+The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.8.0`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
-    //uncomment to access development builds
-    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-scripting:0.7.0")
+    implementation("space.kscience:dataforge-scripting:0.8.0")
 }
 ```
diff --git a/dataforge-workspace/README.md b/dataforge-workspace/README.md
index c096699f..cea37368 100644
--- a/dataforge-workspace/README.md
+++ b/dataforge-workspace/README.md
@@ -6,18 +6,16 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.7.0`.
+The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.8.0`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
-    //uncomment to access development builds
-    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-workspace:0.7.0")
+    implementation("space.kscience:dataforge-workspace:0.8.0")
 }
 ```