Merge pull request '0.7.0' (!79) from dev into master

Reviewed-on: #79
Update gradle
2023-11-26 10:08:10 +03:00 · 2023-11-26 10:07:39 +03:00 · 2023-11-26 10:06:39 +03:00 · 2023-11-26 10:05:19 +03:00 · 2023-11-26 09:59:28 +03:00 · 2023-11-22 17:06:23 +03:00
73 changed files with 977 additions and 765 deletions
--- a/.space.kts
+++ b/.space.kts
@ -1,4 +0,0 @@
-job("Build") {
-    gradlew("openjdk:11", "build")
-}
-
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -14,15 +14,41 @@

 ### Security

+## 0.7.0 - 2023-11-26
+
+### Added
+
+- Obligatory `type: KType` and `descriptor` property for `MetaConverters`
+- Added separate `Meta`, `SealedMeta` and `ObservableMutableMeta` builders.
+
+### Changed
+
+- Meta converter `metaToObject` returns a non-nullable type. Additional method `metaToObjectOrNull` for nullable return.
+- Kotlin 1.9.20.
+- Migrated from ktor-io to kotlinx-io.
+- `MutableMeta` builder now returns a simplified version of meta that does not hold listeners.
+- More concise names for read/write methods in IO.
+- Remove unnecessary confusion with `get`/`getMeta` by removing `getMeta` from the interface.
+
+### Deprecated
+
+- `String.parseValue` is replaced with `Value.parse`
+
+### Fixed
+
+- Memory leak in SealedMeta builder
+
 ## 0.6.2 - 2023-07-29

 ### Changed
+
 - Meta to Json serializer now serializes a single item with index as an array. It is important for plotly integration.
 - Meta to Json serializes Meta without children a value as literal or array instead of an object with `@value` field.

 ## 0.6.1 - 2023-03-31

 ### Added
+
 - File cache for workspace
 - Smart task metadata transformation for workspace
 - Add `readOnly` property to descriptors
@ -32,6 +58,7 @@
 - More fine-grained types in Action builders.

 ### Changed
+
 - `Name::replaceLast` API
 - `PluginFactory` no longer requires plugin class
 - Collection<Named> toMap -> associateByName
@ -53,9 +80,11 @@
 - Separate interfaces for `IOReader` and `IOWriter`

 ### Deprecated
+
 - Context.fetch -> Context.request

 ### Fixed
+
 - `readDataDirectory` does not split names with dots
 - Front matter reader does not crash on non-UTF files
 - Meta file name in readMeta from directory
@ -64,10 +93,12 @@
 ## 0.5.2

 ### Added
+
 - Yaml plugin
 - Partial fix to #53

 ### Fixed
+
 - MutableMetaImpl attachment and checks
 - Listeners in observable meta are replaced by lists
 - JS number comparison bug.
@ -75,9 +106,11 @@
 ## 0.5.0

 ### Added
+
 - Experimental `listOfSpec` delegate.

 ### Changed
+
 - **API breaking** Config is deprecated, use `ObservableMeta` instead.
 - **API breaking** Descriptor no has a member property `defaultValue` instead of `defaultItem()` extension. It caches default value state on the first call. It is done because computing default on each call is too expensive.
 - Kotlin 1.5.10
@ -88,24 +121,28 @@
 - **API breaking** Configurable`config` changed to `meta`

 ### Removed
+
 - `Config`
 - Public PluginManager mutability
 - Tables and tables-exposed moved to the separate project `tables.kt`
 - BinaryMetaFormat. Use CBOR encoding instead

 ### Fixed
+
 - Proper json array index treatment.
 - Proper json index for single-value array.

 ## 0.4.0

 ### Added
+
 - LogManager plugin
 - dataforge-context API dependency on SLF4j
 - Context `withEnv` and `fetch` methods to manipulate plugins without changing plugins after creation.
 - Split `ItemDescriptor` into builder and read-only part

 ### Changed
+
 - Kotlin-logging moved from common to JVM and JS. Replaced by console for native.
 - Package changed to `space.kscience`
 - Scheme made observable
@ -115,18 +152,22 @@
 - Refactor loggers

 ### Deprecated
+
 - Direct use of PluginManager

 ### Removed
+
 - Common dependency on Kotlin-logging
 - Kotlinx-io fork dependency. Replaced by Ktor-io.

 ### Fixed
+
 - Scheme properties properly handle children property change.

 ## 0.3.0

 ### Added
+
 - Yaml meta format based on yaml.kt
 - `Path` builders
 - Special ValueType for lists
@ -134,6 +175,7 @@
 - Multiplatform yaml meta

 ### Changed
+
 - `ListValue` and `DoubleArrayValue` implement `Iterable`.
 - Changed the logic of `Value::isList` to check for type instead of size
 - `Meta{}` builder made inline
@ -150,6 +192,7 @@
 ## 0.2.0

 ### Changed
+
 - Context content resolution refactor
 - Kotlin 1.4.10 (build tools 0.6.0)
 - Empty query in Name is null instead of ""
@ -159,13 +202,16 @@
 - Configurable is no longer MutableItemProvider. All functionality moved to Scheme.

 ### Deprecated
+
 - Context activation API
 - TextRenderer

 ### Removed
+
 - Functional server prototype
 - `dataforge-output` module

 ### Fixed
+
 - Global context CoroutineScope resolution
 - Library mode compliance
--- a/README.md
+++ b/README.md
@ -5,33 +5,30 @@


 ### [dataforge-context](dataforge-context)
-> 
+> Context and provider definitions
 >
 > **Maturity**: DEVELOPMENT

 ### [dataforge-data](dataforge-data)
 >
->
 > **Maturity**: EXPERIMENTAL

 ### [dataforge-io](dataforge-io)
+> IO module
 >
->
-> **Maturity**: PROTOTYPE
+> **Maturity**: EXPERIMENTAL

 ### [dataforge-meta](dataforge-meta)
-> 
+> Meta definition and basic operations on meta
 >
 > **Maturity**: DEVELOPMENT

 ### [dataforge-scripting](dataforge-scripting)
 >
->
 > **Maturity**: PROTOTYPE

 ### [dataforge-workspace](dataforge-workspace)
 >
->
 > **Maturity**: EXPERIMENTAL

 ### [dataforge-io/dataforge-io-yaml](dataforge-io/dataforge-io-yaml)
--- a/build.gradle.kts
+++ b/build.gradle.kts
@ -1,5 +1,4 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-import space.kscience.gradle.isInDevelopment
 import space.kscience.gradle.useApache2Licence
 import space.kscience.gradle.useSPCTeam

@ -9,7 +8,7 @@ plugins {

 allprojects {
    group = "space.kscience"
-    version = "0.6.2"
+    version = "0.7.0"
 }

 subprojects {
@ -31,14 +30,7 @@ ksciencePublish {
        useApache2Licence()
        useSPCTeam()
    }
-    github("dataforge-core", "SciProgCentre")
-    space(
-        if (isInDevelopment) {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/dev"
-        } else {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/maven"
-        }
-    )
+    repository("spc","https://maven.sciprog.center/kscience")
    sonatype()
 }

--- a/dataforge-context/README.md
+++ b/dataforge-context/README.md
@ -6,27 +6,18 @@ Context and provider definitions

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-context:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-context:0.7.0`.

-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-context:0.6.2-dev-2'
-}
-```
 **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:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-context:0.7.0")
 }
 ```
--- a/dataforge-context/api/dataforge-context.api
+++ b/dataforge-context/api/dataforge-context.api
@ -195,7 +195,6 @@ public final class space/kscience/dataforge/context/PluginManager : java/lang/It
 public final class space/kscience/dataforge/context/PluginTag : space/kscience/dataforge/meta/MetaRepr {
 	public static final field Companion Lspace/kscience/dataforge/context/PluginTag$Companion;
 	public static final field DATAFORGE_GROUP Ljava/lang/String;
-	public synthetic fun <init> (ILjava/lang/String;Ljava/lang/String;Ljava/lang/String;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
 	public fun <init> (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
 	public synthetic fun <init> (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public final fun component1 ()Ljava/lang/String;
@ -211,7 +210,6 @@ public final class space/kscience/dataforge/context/PluginTag : space/kscience/d
 	public final fun matches (Lspace/kscience/dataforge/context/PluginTag;)Z
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 	public fun toString ()Ljava/lang/String;
-	public static final synthetic fun write$Self (Lspace/kscience/dataforge/context/PluginTag;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
 }

 public final class space/kscience/dataforge/context/PluginTag$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
--- a/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Plugin.kt
+++ b/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Plugin.kt
@ -3,8 +3,8 @@ package space.kscience.dataforge.context
 import space.kscience.dataforge.context.Plugin.Companion.TARGET
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MetaRepr
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.Named
-import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.parseAsName
 import space.kscience.dataforge.provider.Provider
@ -18,7 +18,7 @@ import space.kscience.dataforge.provider.Provider
 *
 * create - configure - attach - detach - destroy
 */
-@Type(TARGET)
+@DfId(TARGET)
 public interface Plugin : Named, ContextAware, Provider, MetaRepr {

    /**
--- a/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/PluginFactory.kt
+++ b/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/PluginFactory.kt
@ -1,9 +1,9 @@
 package space.kscience.dataforge.context

 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId

-@Type(PluginFactory.TYPE)
+@DfId(PluginFactory.TYPE)
 public interface PluginFactory<T : Plugin> : Factory<T> {
    public val tag: PluginTag

--- a/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/properties/MetaProperty.kt
+++ b/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/properties/MetaProperty.kt
@ -1,7 +1,8 @@
 package space.kscience.dataforge.properties


-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.ObservableMutableMeta
 import space.kscience.dataforge.meta.transformations.MetaConverter
 import space.kscience.dataforge.meta.transformations.nullableMetaToObject
 import space.kscience.dataforge.meta.transformations.nullableObjectToMeta
@ -24,7 +25,7 @@ public class MetaProperty<T : Any>(

    override fun onChange(owner: Any?, callback: (T?) -> Unit) {
        meta.onChange(owner) { name ->
-            if (name.startsWith(this@MetaProperty.name)) callback(converter.nullableMetaToObject(get(name)))
+            if (name.startsWith(this@MetaProperty.name)) callback(converter.nullableMetaToObject(this[name]))
        }
    }

--- a/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/provider/dfType.kt
+++ b/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/provider/dfType.kt
@ -4,29 +4,29 @@ import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.PluginBuilder
 import space.kscience.dataforge.context.gather
 import space.kscience.dataforge.misc.DFExperimental
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.Named
-import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
 import kotlin.reflect.KClass
 import kotlin.reflect.full.findAnnotation


@DFExperimental
-public val KClass<*>.dfType: String
-    get() = findAnnotation<Type>()?.id ?: simpleName ?: ""
+public val KClass<*>.dfId: String
+    get() = findAnnotation<DfId>()?.id ?: simpleName ?: ""

 /**
- * Provide an object with given name inferring target from its type using [Type] annotation
+ * Provide an object with given name inferring target from its type using [DfId] annotation
 */
@DFExperimental
 public inline fun <reified T : Any> Provider.provideByType(name: String): T? {
-    val target = T::class.dfType
+    val target = T::class.dfId
    return provide(target, name)
 }

@DFExperimental
 public inline fun <reified T : Any> Provider.top(): Map<Name, T> {
-    val target = T::class.dfType
+    val target = T::class.dfId
    return top(target)
 }

@ -35,15 +35,15 @@ public inline fun <reified T : Any> Provider.top(): Map<Name, T> {
 */
@DFExperimental
 public inline fun <reified T : Any> Context.gather(inherit: Boolean = true): Map<Name, T> =
-    gather<T>(T::class.dfType, inherit)
+    gather<T>(T::class.dfId, inherit)


@DFExperimental
 public inline fun <reified T : Any> PluginBuilder.provides(items: Map<Name, T>) {
-    provides(T::class.dfType, items)
+    provides(T::class.dfId, items)
 }

@DFExperimental
 public inline fun <reified T : Any> PluginBuilder.provides(vararg items: Named) {
-    provides(T::class.dfType, *items)
+    provides(T::class.dfId, *items)
 }
--- a/dataforge-data/README.md
+++ b/dataforge-data/README.md
@ -6,27 +6,18 @@

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-data:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-data:0.7.0`.

-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-data:0.6.2-dev-2'
-}
-```
 **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:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-data:0.7.0")
 }
 ```
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/Data.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/Data.kt
@ -5,7 +5,7 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MetaRepr
 import space.kscience.dataforge.meta.isEmpty
 import space.kscience.dataforge.misc.DFInternal
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
 import kotlin.reflect.KType
@ -14,7 +14,7 @@ import kotlin.reflect.typeOf
 /**
 * A data element characterized by its meta
 */
-@Type(Data.TYPE)
+@DfId(Data.TYPE)
 public interface Data<out T> : Goal<T>, MetaRepr {
    /**
     * Type marker for the data. The type is known before the calculation takes place so it could be checked.
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSet.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSet.kt
@ -6,7 +6,6 @@ import kotlinx.coroutines.flow.emptyFlow
 import kotlinx.coroutines.flow.mapNotNull
 import space.kscience.dataforge.data.Data.Companion.TYPE_OF_NOTHING
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.set
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.endsWith
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataTree.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataTree.kt
@ -2,7 +2,7 @@ package space.kscience.dataforge.data

 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.misc.DFInternal
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.*
 import kotlin.collections.component1
 import kotlin.collections.component2
@ -31,7 +31,7 @@ public val <T : Any> DataTreeItem<T>.type: KType
 /**
 * A tree-like [DataSet] grouped into the node. All data inside the node must inherit its type
 */
-@Type(DataTree.TYPE)
+@DfId(DataTree.TYPE)
 public interface DataTree<out T : Any> : DataSet<T> {

    /**
--- a/dataforge-io/README.md
+++ b/dataforge-io/README.md
@ -6,27 +6,18 @@ IO module

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-io:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-io:0.7.0`.

-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-io:0.6.2-dev-2'
-}
-```
 **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:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-io:0.7.0")
 }
 ```
--- a/dataforge-io/build.gradle.kts
+++ b/dataforge-io/build.gradle.kts
@ -1,11 +1,11 @@
-import space.kscience.gradle.KScienceVersions
-
 plugins {
    id("space.kscience.gradle.mpp")
 }

 description = "IO module"

+val ioVersion = "0.2.1"
+
 kscience {
    jvm()
    js()
@ -15,11 +15,12 @@ kscience {
        cbor()
    }
    dependencies {
-        api(project(":dataforge-context"))
-        api("io.ktor:ktor-io:${KScienceVersions.ktorVersion}")
+        api(projects.dataforgeContext)
+        api("org.jetbrains.kotlinx:kotlinx-io-core:$ioVersion")
+        api("org.jetbrains.kotlinx:kotlinx-io-bytestring:$ioVersion")
    }
 }

-readme {
-    maturity = space.kscience.gradle.Maturity.PROTOTYPE
+readme{
+    maturity = space.kscience.gradle.Maturity.EXPERIMENTAL
 }
--- a/dataforge-io/dataforge-io-yaml/README.md
+++ b/dataforge-io/dataforge-io-yaml/README.md
@ -6,27 +6,18 @@ YAML meta IO

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.7.0`.

-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-io-yaml:0.6.2-dev-2'
-}
-```
 **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:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-io-yaml:0.7.0")
 }
 ```
--- a/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
+++ b/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
@ -1,7 +1,11 @@
 package space.kscience.dataforge.io.yaml

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.encodeToByteString
+import kotlinx.io.readByteString
+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.io.*
@ -15,49 +19,49 @@ public class FrontMatterEnvelopeFormat(
    private val metaFormatFactory: MetaFormatFactory = YamlMetaFormat,
 ) : EnvelopeFormat {

-    override fun readObject(binary: Binary): Envelope = binary.read {
+    override fun readFrom(binary: Binary): Envelope = binary.read {
        var offset = 0

        offset += discardWithSeparator(
-            SEPARATOR.encodeToByteArray(),
+            SEPARATOR,
            atMost = 1024,
        )

        val line = ByteArray {
-            offset += readWithSeparatorTo(this, "\n".encodeToByteArray())
+            offset += readWithSeparatorTo(this, "\n".encodeToByteString())
        }.decodeToString()

        val readMetaFormat = line.trim().takeIf { it.isNotBlank() }?.let { io.resolveMetaFormat(it) } ?: YamlMetaFormat

        val packet = ByteArray {
-            offset += readWithSeparatorTo(this, SEPARATOR.encodeToByteArray())
+            offset += readWithSeparatorTo(this, SEPARATOR)
        }

        offset += discardLine()

-        val meta = readMetaFormat.readObject(packet.asBinary())
+        val meta = readMetaFormat.readFrom(packet.asBinary())
        Envelope(meta, binary.view(offset))
    }

-    override fun readObject(input: Input): Envelope = readObject(input.readBinary())
+    override fun readFrom(source: Source): Envelope = readFrom(source.readBinary())

-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
        obj: Envelope,
    ) {
        val metaFormat = metaFormatFactory.build(io.context, meta)
        val formatSuffix = if (metaFormat is YamlMetaFormat) "" else metaFormatFactory.shortName
-        output.writeRawString("$SEPARATOR${formatSuffix}\r\n")
-        metaFormat.run { metaFormat.writeObject(output, obj.meta) }
-        output.writeRawString("$SEPARATOR\r\n")
+        sink.writeString("$SEPARATOR${formatSuffix}\r\n")
+        metaFormat.run { metaFormat.writeTo(sink, obj.meta) }
+        sink.writeString("$SEPARATOR\r\n")
        //Printing data
        obj.data?.let { data ->
-            output.writeBinary(data)
+            sink.writeBinary(data)
        }
    }

    public companion object : EnvelopeFormatFactory {
-        public const val SEPARATOR: String = "---"
+        public val SEPARATOR: ByteString = "---".encodeToByteString()

        private val metaTypeRegex = "---(\\w*)\\s*".toRegex()

@ -69,8 +73,8 @@ public class FrontMatterEnvelopeFormat(

        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? = binary.read {
            //read raw string to avoid UTF issues
-            val line = readRawString(3)
-            return@read if (line == "---") {
+            val line = readByteString(3)
+            return@read if (line == "---".encodeToByteString()) {
                default
            } else {
                null
@ -79,15 +83,15 @@ public class FrontMatterEnvelopeFormat(

        private val default by lazy { build(Global, Meta.EMPTY) }

-        override fun readObject(binary: Binary): Envelope = default.readObject(binary)
+        override fun readFrom(binary: Binary): Envelope = default.readFrom(binary)

-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
            obj: Envelope,
-        ): Unit = default.writeObject(output, obj)
+        ): Unit = default.writeTo(sink, obj)


-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)

    }
 }
--- a/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/YamlMetaFormat.kt
+++ b/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/YamlMetaFormat.kt
@ -1,13 +1,13 @@
 package space.kscience.dataforge.io.yaml

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import net.mamoe.yamlkt.*
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.io.MetaFormat
 import space.kscience.dataforge.io.MetaFormatFactory
-import space.kscience.dataforge.io.readUtf8String
-import space.kscience.dataforge.io.writeUtf8String
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.get
@ -32,7 +32,7 @@ public fun Meta.toYaml(): YamlMap {
 private class YamlMeta(private val yamlMap: YamlMap, private val descriptor: MetaDescriptor? = null) : Meta {

    override val value: Value?
-        get() = yamlMap.getStringOrNull(null)?.parseValue()
+        get() = yamlMap.getStringOrNull(null)?.let { Value.parse(it) }

    private fun buildItems(): Map<NameToken, Meta> {
        val map = LinkedHashMap<NameToken, Meta>()
@ -43,13 +43,13 @@ private class YamlMeta(private val yamlMap: YamlMap, private val descriptor: Met
            val token = NameToken(stringKey)
            when (value) {
                YamlNull -> Meta(Null)
-                is YamlLiteral -> map[token] = Meta(value.content.parseValue())
+                is YamlLiteral -> map[token] = Meta(Value.parse(value.content))
                is YamlMap -> map[token] = value.toMeta()
                is YamlList -> if (value.all { it is YamlLiteral }) {
                    val listValue = ListValue(
                        value.map {
                            //We already checked that all values are primitives
-                            (it as YamlLiteral).content.parseValue()
+                            Value.parse((it as YamlLiteral).content)
                        }
                    )
                    map[token] = Meta(listValue)
@ -75,7 +75,7 @@ private class YamlMeta(private val yamlMap: YamlMap, private val descriptor: Met

 public fun YamlElement.toMeta(descriptor: MetaDescriptor? = null): Meta = when (this) {
    YamlNull -> Meta(Null)
-    is YamlLiteral -> Meta(content.parseValue())
+    is YamlLiteral -> Meta(Value.parse(content))
    is YamlMap -> toMeta()
    //We can't return multiple items therefore we create top level node
    is YamlList -> YamlMap(mapOf("@yamlArray" to this)).toMeta(descriptor)
@ -89,14 +89,14 @@ public fun YamlMap.toMeta(): Meta = YamlMeta(this)
 */
 public class YamlMetaFormat(private val meta: Meta) : MetaFormat {

-    override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?) {
+    override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?) {
        val yaml: YamlMap = meta.toYaml()
        val string = Yaml.encodeToString(YamlMap.serializer(), yaml)
-        output.writeUtf8String(string)
+        sink.writeString(string)
    }

-    override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta {
-        val yaml = Yaml.decodeYamlMapFromString(input.readUtf8String())
+    override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta {
+        val yaml = Yaml.decodeYamlMapFromString(source.readString())
        return yaml.toMeta()
    }

@ -109,10 +109,10 @@ public class YamlMetaFormat(private val meta: Meta) : MetaFormat {

        private val default = YamlMetaFormat(Meta.EMPTY)

-        override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?): Unit =
-            default.writeMeta(output, meta, descriptor)
+        override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?): Unit =
+            default.writeMeta(sink, meta, descriptor)

-        override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta =
-            default.readMeta(input, descriptor)
+        override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta =
+            default.readMeta(source, descriptor)
    }
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/Binary.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/Binary.kt
@ -1,6 +1,9 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.buffered
+import kotlinx.io.readByteArray
 import kotlin.math.min

 /**
@ -17,13 +20,13 @@ public interface Binary {
     * Read maximum of [atMost] bytes as input from the binary, starting at [offset]. The generated input is always closed
     * when leaving scope, so it could not be leaked outside of scope of [block].
     */
-    public fun <R> read(offset: Int = 0, atMost: Int = size - offset, block: Input.() -> R): R
+    public fun <R> read(offset: Int = 0, atMost: Int = size - offset, block: Source.() -> R): R

-    public suspend fun <R> readSuspend(offset: Int = 0, atMost: Int = size - offset, block: suspend Input.() -> R): R
+    public suspend fun <R> readSuspend(offset: Int = 0, atMost: Int = size - offset, block: suspend Source.() -> R): R

    /**
     * Read a binary with given [offset] relative to this binary and given [binarySize].
-     * In general, resulting binary is of the same type as this one, but it is not guaranteed.
+     * In general, the resulting binary is of the same type as this one, but it is not guaranteed.
     */
    public fun view(offset: Int, binarySize: Int = size - offset): Binary

@ -38,25 +41,27 @@ internal class ByteArrayBinary(
    override val size: Int = array.size - start,
 ) : Binary {

-    override fun <R> read(offset: Int, atMost: Int, block: Input.() -> R): R {
+    override fun <R> read(offset: Int, atMost: Int, block: Source.() -> R): R {
        require(offset >= 0) { "Offset must be positive" }
        require(offset < array.size) { "Offset $offset is larger than array size" }
-        val input = ByteReadPacket(
+
+        return ByteArraySource(
            array,
            offset + start,
            min(atMost, size - offset)
-        )
-        return input.use(block)
+        ).buffered().use(block)
    }

-    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Input.() -> R): R {
+    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Source.() -> R): R {
        require(offset >= 0) { "Offset must be positive" }
        require(offset < array.size) { "Offset $offset is larger than array size" }
-        val input = ByteReadPacket(
+
+        val input = ByteArraySource(
            array,
            offset + start,
            min(atMost, size - offset)
-        )
+        ).buffered()
+
        return try {
            block(input)
        } finally {
@ -77,26 +82,26 @@ public fun Binary.toByteArray(): ByteArray = if (this is ByteArrayBinary) {
    array.copyOfRange(start, start + size) // TODO do we need to ensure data safety here?
 } else {
    read {
-        readBytes()
+        readByteArray()
    }
 }

 //TODO optimize for file-based Inputs
-public fun Input.readBinary(size: Int? = null): Binary {
-    val array = if (size == null) readBytes() else readBytes(size)
+public fun Source.readBinary(size: Int? = null): Binary {
+    val array = if (size == null) readByteArray() else readByteArray(size)
    return ByteArrayBinary(array)
 }

 /**
 * Direct write of binary to the output. Returns the number of bytes written
 */
-public fun Output.writeBinary(binary: Binary): Int {
+public fun Sink.writeBinary(binary: Binary): Int {
    return if (binary is ByteArrayBinary) {
-        writeFully(binary.array, binary.start, binary.start + binary.size)
+        write(binary.array, binary.start, binary.start + binary.size)
        binary.size
    } else {
        binary.read {
-            copyTo(this@writeBinary).toInt()
+            transferTo(this@writeBinary).toInt()
        }
    }
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeBuilder.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeBuilder.kt
@ -1,6 +1,6 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
 import space.kscience.dataforge.meta.*

 public class EnvelopeBuilder : Envelope {
@ -33,7 +33,7 @@ public class EnvelopeBuilder : Envelope {
    /**
     * Construct a data binary from given builder
     */
-    public inline fun data(block: Output.() -> Unit) {
+    public inline fun data(block: Sink.() -> Unit) {
        data = ByteArray { block() }.asBinary()
    }

--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeFormat.kt
@ -1,10 +1,10 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.Input
+import kotlinx.io.Source
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.io.EnvelopeFormatFactory.Companion.ENVELOPE_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import kotlin.reflect.KType
@ -15,9 +15,9 @@ public interface EnvelopeFormat : IOFormat<Envelope> {
    override val type: KType get() = typeOf<Envelope>()
 }

-public fun EnvelopeFormat.read(input: Input): Envelope = readObject(input)
+public fun EnvelopeFormat.read(input: Source): Envelope = readFrom(input)

-@Type(ENVELOPE_FORMAT_TYPE)
+@DfId(ENVELOPE_FORMAT_TYPE)
 public interface EnvelopeFormatFactory : IOFormatFactory<Envelope>, EnvelopeFormat {
    override val type: KType get() = typeOf<Envelope>()

--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeParts.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeParts.kt
@ -1,5 +1,8 @@
 package space.kscience.dataforge.io

+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.decodeToString
+import kotlinx.io.write
 import space.kscience.dataforge.io.Envelope.Companion.ENVELOPE_NODE_KEY
 import space.kscience.dataforge.io.PartDescriptor.Companion.DEFAULT_MULTIPART_DATA_SEPARATOR
 import space.kscience.dataforge.io.PartDescriptor.Companion.MULTIPART_DATA_TYPE
@ -20,7 +23,7 @@ private class PartDescriptor : Scheme() {
        val PARTS_KEY = MULTIPART_KEY + "parts"
        val SEPARATOR_KEY = MULTIPART_KEY + "separator"

-        const val DEFAULT_MULTIPART_DATA_SEPARATOR = "\r\n#~PART~#\r\n"
+        val DEFAULT_MULTIPART_DATA_SEPARATOR = "\r\n#~PART~#\r\n".toAsciiByteString()

        const val MULTIPART_DATA_TYPE = "envelope.multipart"
    }
@ -32,12 +35,12 @@ public typealias EnvelopeParts = List<EnvelopePart>

 public fun EnvelopeBuilder.multipart(
    parts: EnvelopeParts,
-    separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR,
+    separator: ByteString = DEFAULT_MULTIPART_DATA_SEPARATOR,
 ) {
    dataType = MULTIPART_DATA_TYPE

    var offsetCounter = 0
-    val separatorSize = separator.length
+    val separatorSize = separator.size
    val partDescriptors = parts.map { (binary, description) ->
        offsetCounter += separatorSize
        PartDescriptor {
@ -51,14 +54,14 @@ public fun EnvelopeBuilder.multipart(

    meta {
        if (separator != DEFAULT_MULTIPART_DATA_SEPARATOR) {
-            SEPARATOR_KEY put separator
+            SEPARATOR_KEY put separator.decodeToString()
        }
        setIndexed(PARTS_KEY, partDescriptors.map { it.toMeta() })
    }

    data {
        parts.forEach {
-            writeRawString(separator)
+            write(separator)
            writeBinary(it.binary)
        }
    }
@ -69,7 +72,7 @@ public fun EnvelopeBuilder.multipart(
 */
 public fun EnvelopeBuilder.envelopes(
    envelopes: List<Envelope>,
-    separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR,
+    separator: ByteString = DEFAULT_MULTIPART_DATA_SEPARATOR,
 ) {
    val parts = envelopes.map {
        val binary = Binary(it, TaggedEnvelopeFormat)
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOFormat.kt
@ -1,12 +1,14 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readByteArray
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.io.IOFormatFactory.Companion.IO_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.Named
-import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import kotlin.reflect.KType
@ -21,9 +23,9 @@ public interface IOReader<out T> {
     */
    public val type: KType

-    public fun readObject(input: Input): T
+    public fun readFrom(source: Source): T

-    public fun readObject(binary: Binary): T = binary.read { readObject(this) }
+    public fun readFrom(binary: Binary): T = binary.read { readFrom(this) }

    public companion object {
        /**
@ -32,21 +34,21 @@ public interface IOReader<out T> {
        public val binary: IOReader<Binary> = object : IOReader<Binary> {
            override val type: KType = typeOf<Binary>()

-            override fun readObject(input: Input): Binary = input.readBytes().asBinary()
+            override fun readFrom(source: Source): Binary = source.readByteArray().asBinary()

-            override fun readObject(binary: Binary): Binary = binary
+            override fun readFrom(binary: Binary): Binary = binary
        }
    }
 }

-public inline fun <reified T> IOReader(crossinline read: Input.() -> T): IOReader<T> = object : IOReader<T> {
+public inline fun <reified T> IOReader(crossinline read: Source.() -> T): IOReader<T> = object : IOReader<T> {
    override val type: KType = typeOf<T>()

-    override fun readObject(input: Input): T = input.read()
+    override fun readFrom(source: Source): T = source.read()
 }

 public fun interface IOWriter<in T> {
-    public fun writeObject(output: Output, obj: T)
+    public fun writeTo(sink: Sink, obj: T)
 }

 /**
@ -54,24 +56,23 @@ public fun interface IOWriter<in T> {
 */
 public interface IOFormat<T> : IOReader<T>, IOWriter<T>

-public fun <T : Any> Input.readObject(format: IOReader<T>): T = format.readObject(this@readObject)
+public fun <T : Any> Source.readWith(format: IOReader<T>): T = format.readFrom(this)

-public fun <T : Any> IOFormat<T>.readObjectFrom(binary: Binary): T = binary.read {
-    readObject(this)
+/**
+ * Read given binary as an object using given format
+ */
+public fun <T : Any> Binary.readWith(format: IOReader<T>): T = read {
+    readWith(format)
 }

 /**
- * Read given binary as object using given format
+ * Write an object to the [Sink] with given [format]
 */
-public fun <T : Any> Binary.readWith(format: IOReader<T>): T = read {
-    readObject(format)
-}
-
-public fun <T : Any> Output.writeObject(format: IOWriter<T>, obj: T): Unit =
-    format.writeObject(this@writeObject, obj)
+public fun <T : Any> Sink.writeWith(format: IOWriter<T>, obj: T): Unit =
+    format.writeTo(this, obj)


-@Type(IO_FORMAT_TYPE)
+@DfId(IO_FORMAT_TYPE)
 public interface IOFormatFactory<T : Any> : Factory<IOFormat<T>>, Named {
    /**
     * Explicit type for dynamic type checks
@ -85,18 +86,33 @@ public interface IOFormatFactory<T : Any> : Factory<IOFormat<T>>, Named {
    }
 }

-public fun <T : Any> Binary(obj: T, format: IOWriter<T>): Binary = Binary { format.writeObject(this, obj) }
+public fun <T : Any> Binary(obj: T, format: IOWriter<T>): Binary = Binary { format.writeTo(this, obj) }
+
+public object FloatIOFormat : IOFormat<Float>, IOFormatFactory<Float> {
+    override fun build(context: Context, meta: Meta): IOFormat<Float> = this
+
+    override val name: Name = "float32".asName()
+
+    override val type: KType get() = typeOf<Float>()
+
+    override fun writeTo(sink: Sink, obj: Float) {
+        sink.writeFloat(obj)
+    }
+
+    override fun readFrom(source: Source): Float = source.readFloat()
+}
+

 public object DoubleIOFormat : IOFormat<Double>, IOFormatFactory<Double> {
    override fun build(context: Context, meta: Meta): IOFormat<Double> = this

-    override val name: Name = "double".asName()
+    override val name: Name = "float64".asName()

    override val type: KType get() = typeOf<Double>()

-    override fun writeObject(output: Output, obj: Double) {
-        output.writeDouble(obj)
+    override fun writeTo(sink: Sink, obj: Double) {
+        sink.writeLong(obj.toBits())
    }

-    override fun readObject(input: Input): Double = input.readDouble()
+    override fun readFrom(source: Source): Double = source.readDouble()
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt
@ -1,10 +1,10 @@
-@file:Suppress("UNUSED_PARAMETER")
-
 package space.kscience.dataforge.io


-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
 import space.kscience.dataforge.context.Context
@ -18,13 +18,13 @@ import space.kscience.dataforge.meta.toMeta
 */
 public class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat {

-    override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?) {
+    override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?) {
        val jsonElement = meta.toJson(descriptor)
-        output.writeUtf8String(json.encodeToString(JsonElement.serializer(), jsonElement))
+        sink.writeString(json.encodeToString(JsonElement.serializer(), jsonElement))
    }

-    override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta {
-        val str = input.readUtf8String()//readByteArray().decodeToString()
+    override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta {
+        val str = source.readString()
        val jsonElement = json.parseToJsonElement(str)
        return jsonElement.toMeta(descriptor)
    }
@ -39,10 +39,10 @@ public class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat

        private val default = JsonMetaFormat()

-        override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?): Unit =
-            default.run { writeMeta(output, meta, descriptor) }
+        override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?): Unit =
+            default.run { writeMeta(sink, meta, descriptor) }

-        override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta =
-            default.run { readMeta(input, descriptor) }
+        override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta =
+            default.run { readMeta(source, descriptor) }
    }
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/MetaFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/MetaFormat.kt
@ -1,15 +1,15 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.use
+
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.buffered
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.io.MetaFormatFactory.Companion.META_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
@ -23,22 +23,22 @@ public interface MetaFormat : IOFormat<Meta> {

    override val type: KType get() = typeOf<Meta>()

-    override fun writeObject(output: Output, obj: Meta) {
-        writeMeta(output, obj, null)
+    override fun writeTo(sink: Sink, obj: Meta) {
+        writeMeta(sink, obj, null)
    }

-    override fun readObject(input: Input): Meta = readMeta(input)
+    override fun readFrom(source: Source): Meta = readMeta(source)

    public fun writeMeta(
-        output: Output,
+        sink: Sink,
        meta: Meta,
        descriptor: MetaDescriptor? = null,
    )

-    public fun readMeta(input: Input, descriptor: MetaDescriptor? = null): Meta
+    public fun readMeta(source: Source, descriptor: MetaDescriptor? = null): Meta
 }

-@Type(META_FORMAT_TYPE)
+@DfId(META_FORMAT_TYPE)
 public interface MetaFormatFactory : IOFormatFactory<Meta>, MetaFormat {
    public val shortName: String

@ -57,15 +57,13 @@ public interface MetaFormatFactory : IOFormatFactory<Meta>, MetaFormat {

 public fun Meta.toString(format: MetaFormat): String = ByteArray {
    format.run {
-        writeObject(this@ByteArray, this@toString)
+        writeTo(this@ByteArray, this@toString)
    }
 }.decodeToString()

 public fun Meta.toString(formatFactory: MetaFormatFactory): String = toString(formatFactory.build(Global, Meta.EMPTY))

-public fun MetaFormat.parse(str: String): Meta {
-    return ByteReadPacket(str.encodeToByteArray()).use { readObject(it) }
-}
+public fun MetaFormat.parse(str: String): Meta = readFrom(StringSource(str).buffered())

 public fun MetaFormatFactory.parse(str: String, formatMeta: Meta): Meta = build(Global, formatMeta).parse(str)

--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaggedEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaggedEnvelopeFormat.kt
@ -1,6 +1,7 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
+import kotlinx.io.*
+import kotlinx.io.bytestring.decodeToString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
@ -18,7 +19,7 @@ import space.kscience.dataforge.names.plus
 public class TaggedEnvelopeFormat(
    public val io: IOPlugin,
    public val version: VERSION = VERSION.DF02,
-    public val metaFormatFactory: MetaFormatFactory = JsonMetaFormat
+    public val metaFormatFactory: MetaFormatFactory = JsonMetaFormat,
 ) : EnvelopeFormat {

 //    private val metaFormat = io.metaFormat(metaFormatKey)
@ -26,59 +27,60 @@ public class TaggedEnvelopeFormat(


    private fun Tag.toBinary() = Binary {
-        writeRawString(START_SEQUENCE)
-        writeRawString(version.name)
+        write(START_SEQUENCE)
+        writeString(version.name)
        writeShort(metaFormatKey)
        writeUInt(metaSize)
        when (version) {
            VERSION.DF02 -> {
                writeUInt(dataSize.toUInt())
            }
+
            VERSION.DF03 -> {
                writeULong(dataSize)
            }
        }
-        writeRawString(END_SEQUENCE)
+        write(END_SEQUENCE)
    }

-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
        obj: Envelope,
    ) {
        val metaFormat = metaFormatFactory.build(io.context, Meta.EMPTY)
-        val metaBytes = Binary(obj.meta,metaFormat)
+        val metaBytes = Binary(obj.meta, metaFormat)
        val actualSize: ULong = (obj.data?.size ?: 0).toULong()
        val tag = Tag(metaFormatFactory.key, metaBytes.size.toUInt() + 2u, actualSize)
-        output.writeBinary(tag.toBinary())
-        output.writeBinary(metaBytes)
-        output.writeRawString("\r\n")
+        sink.writeBinary(tag.toBinary())
+        sink.writeBinary(metaBytes)
+        sink.writeString("\r\n")
        obj.data?.let {
-            output.writeBinary(it)
+            sink.writeBinary(it)
        }
    }

    /**
     * Read an envelope from input into memory
     *
-     * @param input an input to read from
+     * @param source an input to read from
     * @param formats a collection of meta formats to resolve
     */
-    override fun readObject(input: Input): Envelope {
-        val tag = input.readTag(this.version)
+    override fun readFrom(source: Source): Envelope {
+        val tag = source.readTag(this.version)

        val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
            ?: error("Meta format with key ${tag.metaFormatKey} not found")

-        val metaBinary = input.readBinary(tag.metaSize.toInt())
+        val metaBinary = source.readBinary(tag.metaSize.toInt())

-        val meta: Meta = metaFormat.readObjectFrom(metaBinary)
+        val meta: Meta = metaFormat.readFrom(metaBinary)

-        val data = input.readBinary(tag.dataSize.toInt())
+        val data = source.readBinary(tag.dataSize.toInt())

        return SimpleEnvelope(meta, data)
    }

-    override fun readObject(binary: Binary): Envelope = binary.read{
+    override fun readFrom(binary: Binary): Envelope = binary.read {
        val tag = readTag(version)

        val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
@ -86,7 +88,7 @@ public class TaggedEnvelopeFormat(

        val metaBinary = readBinary(tag.metaSize.toInt())

-        val meta: Meta = metaFormat.readObjectFrom(metaBinary)
+        val meta: Meta = metaFormat.readFrom(metaBinary)


        SimpleEnvelope(meta, binary.view((version.tagSize + tag.metaSize).toInt(), tag.dataSize.toInt()))
@ -104,8 +106,8 @@ public class TaggedEnvelopeFormat(
    }

    public companion object : EnvelopeFormatFactory {
-        private const val START_SEQUENCE = "#~"
-        private const val END_SEQUENCE = "~#\r\n"
+        private val START_SEQUENCE = "#~".toAsciiByteString()
+        private val END_SEQUENCE = "~#\r\n".toAsciiByteString()

        override val name: Name = EnvelopeFormatFactory.ENVELOPE_FACTORY_NAME + "tagged"

@ -121,27 +123,26 @@ public class TaggedEnvelopeFormat(
            return TaggedEnvelopeFormat(io, version)
        }

-        private fun Input.readTag(version: VERSION): Tag {
-            val start = readRawString(2)
+        private fun Source.readTag(version: VERSION): Tag {
+            val start = readByteString(2)
            if (start != START_SEQUENCE) error("The input is not an envelope")
-            val versionString = readRawString(4)
-            if (version.name != versionString) error("Wrong version of DataForge: expected $version but found $versionString")
+            val versionString = readByteString(4)
+            if (version.name.toAsciiByteString() != versionString) error("Wrong version of DataForge: expected $version but found $versionString")
            val metaFormatKey = readShort()
            val metaLength = readUInt()
            val dataLength: ULong = when (version) {
                VERSION.DF02 -> readUInt().toULong()
                VERSION.DF03 -> readULong()
            }
-            val end = readRawString(4)
+            val end = readByteString(4)
            if (end != END_SEQUENCE) error("The input is not an envelope")
            return Tag(metaFormatKey, metaLength, dataLength)
        }

-        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? {
-            return try {
+        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? = try {
            binary.read {
-                    val header = readRawString(6)
-                    return@read when (header.substring(2..5)) {
+                val header = readByteString(6)
+                when (header.substring(2, 6).decodeToString()) {
                    VERSION.DF02.name -> TaggedEnvelopeFormat(io, VERSION.DF02)
                    VERSION.DF03.name -> TaggedEnvelopeFormat(io, VERSION.DF03)
                    else -> null
@ -150,24 +151,20 @@ public class TaggedEnvelopeFormat(
        } catch (ex: Exception) {
            null
        }
-        }

        private val default by lazy { build(Global, Meta.EMPTY) }

-        override fun readObject(binary: Binary): Envelope =
-            default.run { readObject(binary) }
+        override fun readFrom(binary: Binary): Envelope =
+            default.run { readFrom(binary) }

-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
            obj: Envelope,
        ): Unit = default.run {
-            writeObject(
-                output,
-                obj,
-            )
+            writeTo(sink, obj)
        }

-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)
    }

 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaglessEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaglessEnvelopeFormat.kt
@ -1,9 +1,9 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.readUTF8UntilDelimiterTo
+
+import kotlinx.io.*
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.encodeToByteString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
@ -28,35 +28,36 @@ public class TaglessEnvelopeFormat(
 //        writeFully("#? $key: $value;\r\n".encodeToByteArray())
 //    }

-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
        obj: Envelope,
    ) {
        val metaFormat = metaFormatFactory.build(this.io.context, meta)

        //printing header
-        output.writeRawString(TAGLESS_ENVELOPE_HEADER + "\r\n")
+        sink.write(TAGLESS_ENVELOPE_HEADER)
+        sink.writeString("\r\n")

        //Printing meta
        if (!obj.meta.isEmpty()) {
            val metaBinary = Binary(obj.meta, metaFormat)
-            output.writeUtf8String(META_START + "-${metaFormatFactory.shortName}\r\n")
-            output.writeBinary(metaBinary)
-            output.writeRawString("\r\n")
+            sink.writeString(META_START + "-${metaFormatFactory.shortName}\r\n")
+            sink.writeBinary(metaBinary)
+            sink.writeString("\r\n")
        }

        //Printing data
        obj.data?.let { data ->
            //val actualSize: Int = envelope.data?.size ?: 0
-            output.writeUtf8String(DATA_START + "\r\n")
-            output.writeBinary(data)
+            sink.writeString(DATA_START + "\r\n")
+            sink.writeBinary(data)
        }
    }

-    override fun readObject(input: Input): Envelope {
+    override fun readFrom(source: Source): Envelope {
        //read preamble
-        input.discardWithSeparator(
-            TAGLESS_ENVELOPE_HEADER.encodeToByteArray(),
+        source.discardWithSeparator(
+            TAGLESS_ENVELOPE_HEADER,
            atMost = 1024,
        )

@ -64,22 +65,22 @@ public class TaglessEnvelopeFormat(

        var data: Binary? = null

-        input.discardWithSeparator(
+        source.discardWithSeparator(
            SEPARATOR_PREFIX,
            atMost = 1024,
        )

        var header: String = ByteArray {
-            input.readUTF8UntilDelimiterTo(this, "\n")
+            source.readWithSeparatorTo(this, "\n".encodeToByteString())
        }.decodeToString()

-        while (!input.endOfInput) {
+        while (!source.exhausted()) {
            val block = ByteArray {
-                input.readWithSeparatorTo(this, SEPARATOR_PREFIX)
+                source.readWithSeparatorTo(this, SEPARATOR_PREFIX)
            }

            val nextHeader = ByteArray {
-                input.readWithSeparatorTo(this, "\n".encodeToByteArray())
+                source.readWithSeparatorTo(this, "\n".encodeToByteString())
            }.decodeToString()

            //terminate on end
@ -89,7 +90,7 @@ public class TaglessEnvelopeFormat(
            if (header.startsWith("META")) {
                //TODO check format
                val metaFormat: MetaFormatFactory = JsonMetaFormat
-                meta = metaFormat.readMeta(ByteReadPacket(block))
+                meta = metaFormat.readMeta(ByteArraySource(block).buffered())
            }

            if (header.startsWith("DATA")) {
@ -111,9 +112,9 @@ public class TaglessEnvelopeFormat(

        public const val TAGLESS_ENVELOPE_TYPE: String = "tagless"

-        public val SEPARATOR_PREFIX: ByteArray = "\n#~".encodeToByteArray()
+        public val SEPARATOR_PREFIX: ByteString = "\n#~".encodeToByteString()

-        public const val TAGLESS_ENVELOPE_HEADER: String = "#~DFTL"
+        public val TAGLESS_ENVELOPE_HEADER: ByteString = "#~DFTL".encodeToByteString()

        //        public const val META_START_PROPERTY: String = "metaSeparator"
        public const val META_START: String = "#~META"
@ -131,24 +132,21 @@ public class TaglessEnvelopeFormat(

        private val default by lazy { build(Global, Meta.EMPTY) }

-        override fun readObject(binary: Binary): Envelope = default.run { readObject(binary) }
+        override fun readFrom(binary: Binary): Envelope = default.run { readFrom(binary) }

-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
            obj: Envelope,
        ): Unit = default.run {
-            writeObject(
-                output,
-                obj,
-            )
+            writeTo(sink, obj)
        }

-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)

        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? {
            return try {
                binary.read {
-                    val string = readRawString(TAGLESS_ENVELOPE_HEADER.length)
+                    val string = readByteString(TAGLESS_ENVELOPE_HEADER.size)
                    return@read if (string == TAGLESS_ENVELOPE_HEADER) {
                        TaglessEnvelopeFormat(io)
                    } else {
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt
@ -1,40 +1,41 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.bits.Memory
-import io.ktor.utils.io.charsets.Charsets
-import io.ktor.utils.io.charsets.decodeExactBytes
-import io.ktor.utils.io.core.*
-import io.ktor.utils.io.core.internal.ChunkBuffer
+import kotlinx.io.*
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.decodeToString
+import kotlinx.io.bytestring.encodeToByteString
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.misc.DFExperimental
+import kotlin.math.min

-public fun Output.writeRawString(str: String) {
-    writeFully(str.toByteArray(Charsets.ISO_8859_1))
+/**
+ * Convert a string literal, containing only ASCII characters to a [ByteString].
+ * Throws an error if there are non-ASCII characters.
+ */
+public fun String.toAsciiByteString(): ByteString {
+    val bytes = ByteArray(length) {
+        val char = get(it)
+        val code = char.code
+        if (code > Byte.MAX_VALUE) error("Symbol $char is not ASCII symbol") else code.toByte()
+    }
+    return ByteString(bytes)
 }

-public fun Output.writeUtf8String(str: String) {
-    writeFully(str.encodeToByteArray())
-}
+public inline fun Buffer(block: Sink.() -> Unit): Buffer = Buffer().apply(block)

-public fun Input.readRawString(size: Int): String {
-    return Charsets.ISO_8859_1.newDecoder().decodeExactBytes(this, size)
-}
+//public fun Source.readSafeUtf8Line(): String = readUTF8Line() ?: error("Line not found")

-public fun Input.readUtf8String(): String = readBytes().decodeToString()
+public inline fun ByteArray(block: Sink.() -> Unit): ByteArray =
+    Buffer(block).readByteArray()

-public fun Input.readSafeUtf8Line(): String = readUTF8Line() ?: error("Line not found")
-
-public inline fun ByteArray(block: Output.() -> Unit): ByteArray =
-    buildPacket(block).readBytes()
-
-public inline fun Binary(block: Output.() -> Unit): Binary =
+public inline fun Binary(block: Sink.() -> Unit): Binary =
    ByteArray(block).asBinary()

 public operator fun Binary.get(range: IntRange): Binary = view(range.first, range.last - range.first)

 /**
 * Return inferred [EnvelopeFormat] if only one format could read given file. If no format accepts the binary, return null. If
- * multiple formats accepts binary, throw an error.
+ * multiple formats accept binary, throw an error.
 */
 public fun IOPlugin.peekBinaryEnvelopeFormat(binary: Binary): EnvelopeFormat? {
    val formats = envelopeFormatFactories.mapNotNull { factory ->
@ -56,7 +57,7 @@ public fun IOPlugin.readEnvelope(
    binary: Binary,
    readNonEnvelopes: Boolean = false,
    formatPicker: IOPlugin.(Binary) -> EnvelopeFormat? = IOPlugin::peekBinaryEnvelopeFormat,
-): Envelope = formatPicker(binary)?.readObject(binary) ?: if (readNonEnvelopes) {
+): Envelope = formatPicker(binary)?.readFrom(binary) ?: if (readNonEnvelopes) {
    // if no format accepts file, read it as binary
    Envelope(Meta.EMPTY, binary)
 } else error("Can't infer format for $binary")
@ -96,74 +97,139 @@ private class RingByteArray(
        else -> inputArray.indices.all { inputArray[it] == get(it) }
    }

+    fun contentEquals(byteString: ByteString): Boolean = when {
+        byteString.size != buffer.size -> false
+        size < buffer.size -> false
+        else -> (0 until byteString.size).all { byteString[it] == get(it) }
+    }
+
 }

 private fun RingByteArray.toArray(): ByteArray = ByteArray(size) { get(it) }

 /**
- * Read [Input] into [output] until designated multibyte [separator] and optionally continues until
+ * Read [Source] into [output] until designated multibyte [separator] and optionally continues until
 * the end of the line after it. Throw error if [separator] not found and [atMost] bytes are read.
 * Also fails if [separator] not found until the end of input.
 *
- * Separator itself is not read into Output.
+ * The Separator itself is not read into [Sink].
 *
 * @param errorOnEof if true error is thrown if separator is never encountered
 *
 * @return bytes actually being read, including separator
 */
-public fun Input.readWithSeparatorTo(
-    output: Output,
-    separator: ByteArray,
+public fun Source.readWithSeparatorTo(
+    output: Sink?,
+    separator: ByteString,
    atMost: Int = Int.MAX_VALUE,
    errorOnEof: Boolean = false,
 ): Int {
    var counter = 0
    val rb = RingByteArray(ByteArray(separator.size))
-    takeWhile { buffer ->
-        while (buffer.canRead()) {
-            val byte = buffer.readByte()
+
+    while (!exhausted()) {
+        val byte = readByte()
        counter++
        if (counter >= atMost) error("Maximum number of bytes to be read $atMost reached.")
        rb.push(byte)
        if (rb.contentEquals(separator)) {
            return counter
        } else if (rb.isFull()) {
-                output.writeByte(rb[0])
+            output?.writeByte(rb[0])
        }
    }
-        !endOfInput
-    }
+
    if (errorOnEof) {
        error("Read to the end of input without encountering ${separator.decodeToString()}")
    } else {
-        for(i in 1 until rb.size){
-            output.writeByte(rb[i])
+        for (i in 1 until rb.size) {
+            output?.writeByte(rb[i])
        }
        counter += (rb.size - 1)
        return counter
    }
 }

-public fun Input.discardLine(): Int {
-    return discardUntilDelimiter('\n'.code.toByte()).also {
-        discard(1)
-    }.toInt() + 1
-}
-
-public fun Input.discardWithSeparator(
-    separator: ByteArray,
+/**
+ * Discard all bytes until [separator] is encountered. Separator is discarded sa well.
+ * Return the total number of bytes read.
+ */
+public fun Source.discardWithSeparator(
+    separator: ByteString,
    atMost: Int = Int.MAX_VALUE,
    errorOnEof: Boolean = false,
-): Int {
-    val dummy: Output = object : Output(ChunkBuffer.Pool) {
-        override fun closeDestination() {
+): Int = readWithSeparatorTo(null, separator, atMost, errorOnEof)
+
+/**
+ * Discard all symbol until newline is discovered. Carriage return is not discarded.
+ */
+public fun Source.discardLine(
+    atMost: Int = Int.MAX_VALUE,
+    errorOnEof: Boolean = false,
+): Int = discardWithSeparator("\n".encodeToByteString(), atMost, errorOnEof)
+
+
+/**
+ * A [Source] based on [ByteArray]
+ */
+internal class ByteArraySource(
+    private val byteArray: ByteArray,
+    private val offset: Int = 0,
+    private val size: Int = byteArray.size - offset,
+) : RawSource {
+
+    init {
+        require(offset >= 0) { "Offset must be positive" }
+        require(offset + size <= byteArray.size) { "End index is ${offset + size}, but the array size is ${byteArray.size}" }
+    }
+
+    private var pointer = offset
+
+    override fun close() {
        // Do nothing
    }

-        override fun flush(source: Memory, offset: Int, length: Int) {
-            // Do nothing
+    override fun readAtMostTo(sink: Buffer, byteCount: Long): Long {
+        if (pointer == offset + size) return -1
+        val byteRead = min(byteCount.toInt(), (size + offset - pointer))
+        sink.write(byteArray, pointer, pointer + byteRead)
+        pointer += byteRead
+        return byteRead.toLong()
    }
-    }
-
-    return readWithSeparatorTo(dummy, separator, atMost, errorOnEof)
 }
+
+/**
+ * A [Source] based on [String]
+ */
+public class StringSource(
+    public val string: String,
+    public val offset: Int = 0,
+    public val size: Int = string.length - offset,
+) : RawSource {
+
+    private var pointer = offset
+
+    override fun close() {
+        // Do nothing
+    }
+
+    override fun readAtMostTo(sink: Buffer, byteCount: Long): Long {
+        if (pointer == offset + size) return -1
+        val byteRead = min(byteCount.toInt(), (size + offset - pointer))
+        sink.writeString(string, pointer, pointer + byteRead)
+        pointer += byteRead
+        return byteRead.toLong()
+    }
+}
+
+public fun Sink.writeDouble(value: Double) {
+    writeLong(value.toBits())
+}
+
+public fun Source.readDouble(): Double = Double.fromBits(readLong())
+
+public fun Sink.writeFloat(value: Float) {
+    writeInt(value.toBits())
+}
+
+public fun Source.readFloat(): Float = Float.fromBits(readInt())
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/BinaryTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/BinaryTest.kt
@ -1,6 +1,5 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.readInt
 import kotlin.test.Test
 import kotlin.test.assertEquals

--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/EnvelopeFormatTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/EnvelopeFormatTest.kt
@ -1,6 +1,7 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.readBytes
+import kotlinx.io.readByteArray
+import kotlinx.io.writeString
 import kotlin.test.Test
 import kotlin.test.assertEquals

@ -12,7 +13,7 @@ class EnvelopeFormatTest {
            "d" put 22.2
        }
        data {
-            writeUtf8String("12345678")
+            writeString("12345678")
        }
    }

@ -22,7 +23,7 @@ class EnvelopeFormatTest {
        val res = readFromByteArray(byteArray)
        assertEquals(envelope.meta, res.meta)
        val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
        }
        assertEquals("12345678", bytes?.decodeToString())
    }
@ -34,13 +35,13 @@ class EnvelopeFormatTest {
        val res = readFromByteArray(byteArray)
        assertEquals(envelope.meta, res.meta)
        val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
        }
        assertEquals("12345678", bytes?.decodeToString())
    }

    @Test
-    fun testManualDftl(){
+    fun testManualDftl() {
        val envelopeString = """
            #~DFTL
            #~META
@ -56,7 +57,7 @@ class EnvelopeFormatTest {
        val res = TaglessEnvelopeFormat.readFromByteArray(envelopeString.encodeToByteArray())
        assertEquals(envelope.meta, res.meta)
        val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
        }
        assertEquals("12345678", bytes?.decodeToString())
    }
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/IOTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/IOTest.kt
@ -1,8 +1,9 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.readBytes
-import io.ktor.utils.io.core.readUTF8Line
+import kotlinx.io.buffered
+import kotlinx.io.bytestring.encodeToByteString
+import kotlinx.io.readByteArray
+import kotlinx.io.readLine
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFails
@ -11,9 +12,9 @@ class IOTest {
    @Test
    fun readBytes() {
        val bytes = ByteArray(8) { it.toByte() }
-        val input = ByteReadPacket(bytes)
-        @Suppress("UNUSED_VARIABLE") val first = input.readBytes(4)
-        val second = input.readBytes(4)
+        val input = ByteArraySource(bytes).buffered()
+        @Suppress("UNUSED_VARIABLE") val first = input.readByteArray(4)
+        val second = input.readByteArray(4)
        assertEquals(4.toByte(), second[0])
    }

@ -31,25 +32,25 @@ class IOTest {

        binary.read {
            val array = ByteArray {
-                val read = readWithSeparatorTo(this, "---".encodeToByteArray()) + discardLine()
+                val read = readWithSeparatorTo(this, "---".encodeToByteString()) + discardLine()
                assertEquals(12, read)
            }
            assertEquals("""
                aaa
                bbb
            """.trimIndent(),array.decodeToString().trim())
-            assertEquals("ccc", readUTF8Line()?.trim())
+            assertEquals("ccc", readLine()?.trim())
        }

        assertFails {
            binary.read {
-                discardWithSeparator("---".encodeToByteArray(), atMost = 3 )
+                discardWithSeparator("---".encodeToByteString(), atMost = 3 )
            }
        }

        assertFails {
            binary.read{
-                discardWithSeparator("-+-".encodeToByteArray(), errorOnEof = true)
+                discardWithSeparator("-+-".encodeToByteString(), errorOnEof = true)
            }
        }

--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MetaFormatTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MetaFormatTest.kt
@ -7,11 +7,11 @@ import kotlin.test.assertEquals


 fun Meta.toByteArray(format: MetaFormat = JsonMetaFormat) = ByteArray {
-    format.writeObject(this@ByteArray, this@toByteArray)
+    format.writeTo(this@ByteArray, this@toByteArray)
 }

 fun MetaFormat.fromByteArray(packet: ByteArray): Meta {
-    return packet.asBinary().read { readObject(this) }
+    return packet.asBinary().read { readFrom(this) }
 }

 class MetaFormatTest {
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MultipartTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MultipartTest.kt
@ -1,5 +1,6 @@
 package space.kscience.dataforge.io

+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.int
@ -18,9 +19,9 @@ class MultipartTest {
                "value" put it
            }
            data {
-                writeUtf8String("Hello World $it")
+                writeString("Hello World $it")
                repeat(300) {
-                    writeRawString("$it ")
+                    writeString("$it ")
                }
            }
        }
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/ioTestUtils.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/ioTestUtils.kt
@ -1,12 +1,11 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.use
+import kotlinx.io.buffered


 fun <T : Any> IOFormat<T>.writeToByteArray(obj: T): ByteArray = ByteArray {
-    writeObject(this, obj)
+    writeTo(this, obj)
 }
-fun <T : Any> IOFormat<T>.readFromByteArray(array: ByteArray): T = ByteReadPacket(array).use {
-    readObject(it)
+fun <T : Any> IOFormat<T>.readFromByteArray(array: ByteArray): T = ByteArraySource(array).buffered().use {
+    readFrom(it)
 }
--- a/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/fileIO.kt
+++ b/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/fileIO.kt
@ -1,8 +1,11 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
-import io.ktor.utils.io.streams.asOutput
+
 import kotlinx.coroutines.runBlocking
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.asSink
+import kotlinx.io.buffered
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.isEmpty
@ -23,18 +26,18 @@ internal class PathBinary(
    override val size: Int = Files.size(path).toInt() - fileOffset,
 ) : Binary {

-    override fun <R> read(offset: Int, atMost: Int, block: Input.() -> R): R = runBlocking {
+    override fun <R> read(offset: Int, atMost: Int, block: Source.() -> R): R = runBlocking {
        readSuspend(offset, atMost, block)
    }

-    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Input.() -> R): R {
+    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Source.() -> R): R {
        val actualOffset = offset + fileOffset
        val actualSize = min(atMost, size - offset)
        val array = path.inputStream().use {
            it.skip(actualOffset.toLong())
            it.readNBytes(actualSize)
        }
-        return ByteReadPacket(array).block()
+        return ByteArraySource(array).buffered().use { it.block() }
    }

    override fun view(offset: Int, binarySize: Int) = PathBinary(path, fileOffset + offset, binarySize)
@ -42,40 +45,40 @@ internal class PathBinary(

 public fun Path.asBinary(): Binary = PathBinary(this)

-public fun <R> Path.read(block: Input.() -> R): R = asBinary().read(block = block)
+public fun <R> Path.read(block: Source.() -> R): R = asBinary().read(block = block)

 /**
 * Write a live output to a newly created file. If file does not exist, throws error
 */
-public fun Path.write(block: Output.() -> Unit): Unit {
+public fun Path.write(block: Sink.() -> Unit): Unit {
    val stream = Files.newOutputStream(this, StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW)
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }

 /**
 * Create a new file or append to exiting one with given output [block]
 */
-public fun Path.append(block: Output.() -> Unit): Unit {
+public fun Path.append(block: Sink.() -> Unit): Unit {
    val stream = Files.newOutputStream(
        this,
        StandardOpenOption.WRITE, StandardOpenOption.APPEND, StandardOpenOption.CREATE
    )
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }

 /**
 * Create a new file or replace existing one using given output [block]
 */
-public fun Path.rewrite(block: Output.() -> Unit): Unit {
+public fun Path.rewrite(block: Sink.() -> Unit): Unit {
    val stream = Files.newOutputStream(
        this,
        StandardOpenOption.WRITE, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE
    )
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }

@DFExperimental
-public fun EnvelopeFormat.readFile(path: Path): Envelope = readObject(path.asBinary())
+public fun EnvelopeFormat.readFile(path: Path): Envelope = readFrom(path.asBinary())

 /**
 * Resolve IOFormat based on type
@ -235,7 +238,7 @@ public fun IOPlugin.writeEnvelopeFile(
    envelopeFormat: EnvelopeFormat = TaggedEnvelopeFormat,
 ) {
    path.rewrite {
-        envelopeFormat.writeObject(this, envelope)
+        envelopeFormat.writeTo(this, envelope)
    }
 }

@ -260,7 +263,7 @@ public fun IOPlugin.writeEnvelopeDirectory(
    val dataFile = path.resolve(IOPlugin.DATA_FILE_NAME)
    dataFile.write {
        envelope.data?.read {
-            val copied = copyTo(this@write)
+            val copied = transferTo(this@write)
            if (copied != envelope.data?.size?.toLong()) {
                error("The number of copied bytes does not equal data size")
            }
--- a/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/resourceIO.kt
+++ b/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/resourceIO.kt
@ -1,9 +1,11 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.streams.asInput
+import kotlinx.io.Source
+import kotlinx.io.asSource
+import kotlinx.io.buffered

-public fun IOPlugin.resource(name: String): Binary? = context.javaClass.getResource(name)?.readBytes()?.asBinary()

-public inline fun <R> IOPlugin.readResource(name: String, block: Input.() -> R): R =
-    context.javaClass.getResource(name)?.openStream()?.asInput()?.block() ?: error("Can't read resource $name")
+public fun IOPlugin.resource(name: String): Binary? = { }.javaClass.getResource(name)?.readBytes()?.asBinary()
+
+public inline fun <R> IOPlugin.readResource(name: String, block: Source.() -> R): R =
+    {  }.javaClass.getResource(name)?.openStream()?.asSource()?.buffered()?.block() ?: error("Can't read resource $name")
--- a/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/workDirectory.kt
+++ b/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/workDirectory.kt
@ -1,7 +1,6 @@
 package space.kscience.dataforge.io

 import space.kscience.dataforge.context.ContextBuilder
-import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.set
 import space.kscience.dataforge.meta.string
 import java.nio.file.Path
--- a/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileBinaryTest.kt
+++ b/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileBinaryTest.kt
@ -1,6 +1,5 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.writeDouble
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files
--- a/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileEnvelopeTest.kt
+++ b/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileEnvelopeTest.kt
@ -1,6 +1,5 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.writeDouble
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files
--- a/dataforge-meta/README.md
+++ b/dataforge-meta/README.md
@ -6,27 +6,18 @@ Meta definition and basic operations on meta

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-meta:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-meta:0.7.0`.

-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-meta:0.6.2-dev-2'
-}
-```
 **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:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-meta:0.7.0")
 }
 ```
--- a/dataforge-meta/api/dataforge-meta.api
+++ b/dataforge-meta/api/dataforge-meta.api
@ -45,9 +45,9 @@ public final class space/kscience/dataforge/meta/False : space/kscience/dataforg

 public final class space/kscience/dataforge/meta/JsonMetaKt {
 	public static final fun getJSON_ARRAY_KEY (Lspace/kscience/dataforge/meta/Meta$Companion;)Ljava/lang/String;
-	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toJson (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
-	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonElement;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonObject;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
@ -59,11 +59,11 @@ public final class space/kscience/dataforge/meta/JsonMetaKt {
 public final class space/kscience/dataforge/meta/Laminate : space/kscience/dataforge/meta/TypedMeta {
 	public static final field Companion Lspace/kscience/dataforge/meta/Laminate$Companion;
 	public fun equals (Ljava/lang/Object;)Z
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Laminate;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getItems ()Ljava/util/Map;
 	public final fun getLayers ()Ljava/util/List;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Laminate;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public final fun merge ()Lspace/kscience/dataforge/meta/SealedMeta;
@ -122,8 +122,8 @@ public abstract interface class space/kscience/dataforge/meta/Meta : space/kscie
 	public static final field TYPE Ljava/lang/String;
 	public static final field VALUE_KEY Ljava/lang/String;
 	public abstract fun equals (Ljava/lang/Object;)Z
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public abstract fun getItems ()Ljava/util/Map;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public abstract fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public abstract fun hashCode ()I
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
@ -137,10 +137,26 @@ public final class space/kscience/dataforge/meta/Meta$Companion {
 	public final fun equals (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/Meta;)Z
 	public final fun getEMPTY ()Lspace/kscience/dataforge/meta/Meta;
 	public final fun hashCode (Lspace/kscience/dataforge/meta/Meta;)I
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 	public final fun toString (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/String;
 }

-public abstract interface annotation class space/kscience/dataforge/meta/MetaBuilder : java/lang/annotation/Annotation {
+public final class space/kscience/dataforge/meta/MetaBuilder : space/kscience/dataforge/meta/MutableMeta {
+	public fun <init> ()V
+	public fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;)V
+	public synthetic fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getItems ()Ljava/util/Map;
+	public fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaBuilder;
+	public synthetic fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
+	public fun hashCode ()I
+	public fun set (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
+	public fun setValue (Lspace/kscience/dataforge/meta/Value;)V
+	public fun toString ()Ljava/lang/String;
+}
+
+public abstract interface annotation class space/kscience/dataforge/meta/MetaBuilderMarker : java/lang/annotation/Annotation {
 }

 public final class space/kscience/dataforge/meta/MetaDelegateKt {
@ -204,11 +220,7 @@ public final class space/kscience/dataforge/meta/MetaKt {
 	public static final fun getIndexed (Lspace/kscience/dataforge/meta/TypedMeta;Lspace/kscience/dataforge/names/Name;)Ljava/util/Map;
 	public static final fun getInt (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Integer;
 	public static final fun getLong (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Long;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Ljava/lang/String;)Lspace/kscience/dataforge/meta/Meta;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/names/NameToken;)Lspace/kscience/dataforge/meta/Meta;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/TypedMeta;Ljava/lang/String;)Lspace/kscience/dataforge/meta/TypedMeta;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/TypedMeta;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public static final fun getNumber (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Number;
 	public static final fun getSelf (Lspace/kscience/dataforge/meta/TypedMeta;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public static final fun getShort (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Short;
@ -223,7 +235,7 @@ public final class space/kscience/dataforge/meta/MetaKt {
 }

 public abstract interface class space/kscience/dataforge/meta/MetaProvider : space/kscience/dataforge/meta/ValueProvider {
-	public abstract fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public abstract fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public fun getValue (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Value;
 }

@ -241,9 +253,10 @@ public final class space/kscience/dataforge/meta/MetaSerializer : kotlinx/serial
 }

 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;
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
 	public abstract fun getItems ()Ljava/util/Map;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
 	public abstract fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun put (Ljava/lang/String;Ljava/lang/Enum;)V
@ -269,6 +282,10 @@ public abstract interface class space/kscience/dataforge/meta/MutableMeta : spac
 	public fun setValue (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 }

+public final class space/kscience/dataforge/meta/MutableMeta$Companion {
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
 public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
 	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadWriteProperty;
@ -325,9 +342,9 @@ public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
 }

 public final class space/kscience/dataforge/meta/MutableMetaKt {
-	public static final fun MutableMeta ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public static final fun MutableMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public static synthetic fun MutableMeta$default (Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public static final fun ObservableMutableMeta ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public static final fun ObservableMutableMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public static synthetic fun ObservableMutableMeta$default (Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
 	public static final fun append (Lspace/kscience/dataforge/meta/MutableMeta;Ljava/lang/String;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun append (Lspace/kscience/dataforge/meta/MutableMeta;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;)V
 	public static final fun append (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
@ -343,7 +360,6 @@ public final class space/kscience/dataforge/meta/MutableMetaKt {
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Ljava/lang/Iterable;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Ljava/lang/Iterable;)V
-	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/NameToken;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableTypedMeta;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableValueProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
@ -355,8 +371,8 @@ public final class space/kscience/dataforge/meta/MutableMetaKt {
 }

 public abstract interface class space/kscience/dataforge/meta/MutableMetaProvider : space/kscience/dataforge/meta/MetaProvider, space/kscience/dataforge/meta/MutableValueProvider {
-	public abstract fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
-	public abstract fun setMeta (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
+	public abstract fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public abstract fun set (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
 	public abstract fun setValue (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 }

@ -370,7 +386,7 @@ public final class space/kscience/dataforge/meta/MutableMetaSerializer : kotlinx
 }

 public abstract interface class space/kscience/dataforge/meta/MutableTypedMeta : space/kscience/dataforge/meta/MutableMeta, space/kscience/dataforge/meta/TypedMeta {
-	public abstract fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
+	public abstract fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
 }

@ -413,11 +429,11 @@ public final class space/kscience/dataforge/meta/ObservableMetaWrapperKt {
 }

 public abstract interface class space/kscience/dataforge/meta/ObservableMutableMeta : space/kscience/dataforge/meta/MutableMeta, space/kscience/dataforge/meta/MutableTypedMeta, space/kscience/dataforge/meta/ObservableMeta {
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
 }

@ -429,12 +445,12 @@ public abstract interface class space/kscience/dataforge/meta/ReadOnlySpecificat

 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 {
 	public fun <init> ()V
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
 	public final fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public synthetic fun getMeta ()Lspace/kscience/dataforge/meta/MutableMeta;
 	public final fun getMeta ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
-	public fun setMeta (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
+	public fun set (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
 	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;
@ -463,13 +479,12 @@ public class space/kscience/dataforge/meta/SchemeSpec : space/kscience/dataforge

 public final class space/kscience/dataforge/meta/SealedMeta : space/kscience/dataforge/meta/TypedMeta {
 	public static final field Companion Lspace/kscience/dataforge/meta/SealedMeta$Companion;
-	public synthetic fun <init> (ILspace/kscience/dataforge/meta/Value;Ljava/util/Map;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
+	public fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;)V
 	public fun equals (Ljava/lang/Object;)Z
 	public fun getItems ()Ljava/util/Map;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
-	public static final synthetic fun write$Self (Lspace/kscience/dataforge/meta/SealedMeta;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
 }

 public final class space/kscience/dataforge/meta/SealedMeta$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
@ -490,9 +505,13 @@ public final class space/kscience/dataforge/meta/SealedMeta$Companion {
 public final class space/kscience/dataforge/meta/SealedMetaKt {
 	public static final fun Meta (Ljava/lang/Number;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun Meta (Ljava/lang/String;)Lspace/kscience/dataforge/meta/SealedMeta;
-	public static final fun Meta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/SealedMeta;
+	public static final fun Meta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/Meta;
 	public static final fun Meta (Lspace/kscience/dataforge/meta/Value;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun Meta (Z)Lspace/kscience/dataforge/meta/SealedMeta;
+	public static final fun MutableMeta ()Lspace/kscience/dataforge/meta/MutableMeta;
+	public static final fun MutableMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public static synthetic fun MutableMeta$default (Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public static final fun SealedMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun seal (Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/SealedMeta;
 }

@ -541,9 +560,9 @@ public final class space/kscience/dataforge/meta/True : space/kscience/dataforge
 }

 public abstract interface class space/kscience/dataforge/meta/TypedMeta : space/kscience/dataforge/meta/Meta {
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public abstract fun getItems ()Ljava/util/Map;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 }

@ -561,6 +580,8 @@ public abstract interface class space/kscience/dataforge/meta/Value {
 public final class space/kscience/dataforge/meta/Value$Companion {
 	public static final field TYPE Ljava/lang/String;
 	public final fun of (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Value;
+	public final fun parse (Ljava/lang/String;)Lspace/kscience/dataforge/meta/Value;
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }

 public final class space/kscience/dataforge/meta/ValueExtensionsKt {
@ -635,21 +656,11 @@ public final class space/kscience/dataforge/meta/ValueType : java/lang/Enum {
 	public static final field NULL Lspace/kscience/dataforge/meta/ValueType;
 	public static final field NUMBER Lspace/kscience/dataforge/meta/ValueType;
 	public static final field STRING Lspace/kscience/dataforge/meta/ValueType;
+	public static fun getEntries ()Lkotlin/enums/EnumEntries;
 	public static fun valueOf (Ljava/lang/String;)Lspace/kscience/dataforge/meta/ValueType;
 	public static fun values ()[Lspace/kscience/dataforge/meta/ValueType;
 }

-public final class space/kscience/dataforge/meta/ValueType$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
-	public static final field INSTANCE Lspace/kscience/dataforge/meta/ValueType$$serializer;
-	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
-	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/ValueType;
-	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
-	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/ValueType;)V
-	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
-}
-
 public final class space/kscience/dataforge/meta/ValueType$Companion {
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
@ -661,34 +672,30 @@ public abstract interface class space/kscience/dataforge/meta/descriptors/Descri
 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor {
 	public static final field Companion Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion;
 	public fun <init> ()V
-	public synthetic fun <init> (ILjava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
-	public fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;)V
-	public synthetic fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;)V
+	public synthetic fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public final fun component1 ()Ljava/lang/String;
 	public final fun component2 ()Ljava/util/Map;
 	public final fun component3 ()Z
-	public final fun component4 ()Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+	public final fun component4 ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun component5 ()Ljava/util/List;
 	public final fun component6 ()Ljava/lang/String;
 	public final fun component7 ()Lspace/kscience/dataforge/meta/Value;
-	public final fun component8 ()Z
-	public final fun component9 ()Lspace/kscience/dataforge/meta/Meta;
-	public final fun copy (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public final fun component8 ()Lspace/kscience/dataforge/meta/Meta;
+	public final fun copy (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public fun equals (Ljava/lang/Object;)Z
 	public final fun getAttributes ()Lspace/kscience/dataforge/meta/Meta;
 	public final fun getChildren ()Ljava/util/Map;
 	public final fun getDefaultNode ()Lspace/kscience/dataforge/meta/Meta;
 	public final fun getDefaultValue ()Lspace/kscience/dataforge/meta/Value;
+	public final fun getDescription ()Ljava/lang/String;
 	public final fun getIndexKey ()Ljava/lang/String;
-	public final fun getInfo ()Ljava/lang/String;
 	public final fun getMultiple ()Z
-	public final fun getReadOnly ()Z
-	public final fun getValueRequirement ()Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+	public final fun getValueRestriction ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun getValueTypes ()Ljava/util/List;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
-	public static final synthetic fun write$Self (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
 }

 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
@ -703,6 +710,7 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$ser
 }

 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion {
+	public final fun getEMPTY ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }

@ -719,9 +727,8 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun getIndexKey ()Ljava/lang/String;
 	public final fun getInfo ()Ljava/lang/String;
 	public final fun getMultiple ()Z
-	public final fun getReadOnly ()Z
-	public final fun getType ()Ljava/util/List;
-	public final fun getValueRequirement ()Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+	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;
@ -733,10 +740,9 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun setIndexKey (Ljava/lang/String;)V
 	public final fun setInfo (Ljava/lang/String;)V
 	public final fun setMultiple (Z)V
-	public final fun setReadOnly (Z)V
-	public final fun setType (Ljava/util/List;)V
-	public final fun setValueRequirement (Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;)V
-	public final fun type (Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;)V
+	public final fun setValueRestriction (Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;)V
+	public final fun setValueTypes (Ljava/util/List;)V
+	public final fun valueType (Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;)V
 }

 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilderKt {
@ -764,12 +770,13 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorKt {
 	public static final fun validate (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lspace/kscience/dataforge/meta/Value;)Z
 }

-public final class space/kscience/dataforge/meta/descriptors/ValueRequirement : java/lang/Enum {
-	public static final field ABSENT Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static final field NONE Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static final field REQUIRED Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static fun valueOf (Ljava/lang/String;)Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static fun values ()[Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+public final class space/kscience/dataforge/meta/descriptors/ValueRestriction : java/lang/Enum {
+	public static final field ABSENT Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public static final field NONE Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public static final field REQUIRED Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public static fun getEntries ()Lkotlin/enums/EnumEntries;
+	public static fun valueOf (Ljava/lang/String;)Lspace/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 {
@ -788,7 +795,10 @@ public final class space/kscience/dataforge/meta/transformations/KeepTransformat

 public abstract interface class space/kscience/dataforge/meta/transformations/MetaConverter {
 	public static final field Companion Lspace/kscience/dataforge/meta/transformations/MetaConverter$Companion;
-	public abstract fun metaToObject (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	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;
 }

@ -893,6 +903,10 @@ public abstract interface annotation class space/kscience/dataforge/misc/DFExper
 public abstract interface annotation class space/kscience/dataforge/misc/DFInternal : java/lang/annotation/Annotation {
 }

+public abstract interface annotation class space/kscience/dataforge/misc/DfId : java/lang/annotation/Annotation {
+	public abstract fun id ()Ljava/lang/String;
+}
+
 public abstract interface class space/kscience/dataforge/misc/Named {
 	public static final field Companion Lspace/kscience/dataforge/misc/Named$Companion;
 	public abstract fun getName ()Lspace/kscience/dataforge/names/Name;
@ -906,10 +920,6 @@ public final class space/kscience/dataforge/misc/NamedKt {
 	public static final fun isAnonymous (Lspace/kscience/dataforge/misc/Named;)Z
 }

-public abstract interface annotation class space/kscience/dataforge/misc/Type : java/lang/annotation/Annotation {
-	public abstract fun id ()Ljava/lang/String;
-}
-
 public final class space/kscience/dataforge/names/Name {
 	public static final field Companion Lspace/kscience/dataforge/names/Name$Companion;
 	public static final field NAME_SEPARATOR Ljava/lang/String;
@ -944,6 +954,7 @@ public final class space/kscience/dataforge/names/NameKt {
 	public static synthetic fun get$default (Ljava/util/Map;Ljava/lang/String;Ljava/lang/String;ILjava/lang/Object;)Ljava/lang/Object;
 	public static final fun getLength (Lspace/kscience/dataforge/names/Name;)I
 	public static final fun isEmpty (Lspace/kscience/dataforge/names/Name;)Z
+	public static final fun last (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/names/NameToken;
 	public static final fun lastOrNull (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/names/NameToken;
 	public static final fun parseAsName (Ljava/lang/String;Z)Lspace/kscience/dataforge/names/Name;
 	public static synthetic fun parseAsName$default (Ljava/lang/String;ZILjava/lang/Object;)Lspace/kscience/dataforge/names/Name;
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/JsonMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/JsonMeta.kt
@ -81,7 +81,7 @@ public fun JsonPrimitive.toValue(descriptor: MetaDescriptor?): Value = when (thi
            content.asValue()
        } else {
            //consider using LazyParse
-            content.parseValue()
+            Value.parse(content)
        }
    }
 }
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Laminate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Laminate.kt
@ -17,8 +17,8 @@ public class Laminate internal constructor(public val layers: List<Meta>) : Type
        }
    }

-    override fun getMeta(name: Name): Laminate? {
-        val childLayers = layers.mapNotNull { it.getMeta(name) }
+    override fun get(name: Name): Laminate? {
+        val childLayers = layers.mapNotNull { it.get(name) }
        return if (childLayers.isEmpty()) null else Laminate(childLayers)
    }

--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt
@ -2,7 +2,7 @@ package space.kscience.dataforge.meta

 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.unsafeCast
 import space.kscience.dataforge.names.*
 import kotlin.jvm.JvmName
@ -21,9 +21,9 @@ public interface MetaRepr {
 * A container for meta nodes
 */
 public fun interface MetaProvider : ValueProvider {
-    public fun getMeta(name: Name): Meta?
+    public operator fun get(name: Name): Meta?

-    override fun getValue(name: Name): Value? = getMeta(name)?.value
+    override fun getValue(name: Name): Value? = get(name)?.value
 }

 /**
@ -31,13 +31,13 @@ public fun interface MetaProvider : ValueProvider {
 * TODO add documentation
 * Same name siblings are supported via elements with the same [Name] but different indices.
 */
-@Type(Meta.TYPE)
+@DfId(Meta.TYPE)
@Serializable(MetaSerializer::class)
 public interface Meta : MetaRepr, MetaProvider {
    public val value: Value?
    public val items: Map<NameToken, Meta>

-    override fun getMeta(name: Name): Meta? {
+    override fun get(name: Name): Meta? {
        tailrec fun Meta.find(name: Name): Meta? = if (name.isEmpty()) {
            this
        } else {
@ -50,7 +50,9 @@ public interface Meta : MetaRepr, MetaProvider {
    override fun toMeta(): Meta = this

    override fun toString(): String
+
    override fun equals(other: Any?): Boolean
+
    override fun hashCode(): Int

    public companion object {
@ -106,21 +108,13 @@ public operator fun Meta.get(token: NameToken): Meta? = items[token]
 *
 * If [name] is empty return current [Meta]
 */
-public operator fun Meta?.get(name: Name): Meta? = this?.getMeta(name)
-
-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun Meta.get(name: Name): Meta? = getMeta(name)
+public operator fun Meta?.get(name: Name): Meta? = this?.get(name)

 /**
 * Parse [Name] from [key] using full name notation and pass it to [Meta.get]
 */
 public operator fun Meta?.get(key: String): Meta? = this?.get(key.parseAsName(true))

-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun Meta.get(key: String): Meta? = get(key.parseAsName(true))
-
 /**
 * Get all items matching given name. The index of the last element, if present is used as a [Regex],
 * against which indexes of elements are matched.
@ -157,7 +151,7 @@ public interface TypedMeta<out M : TypedMeta<M>> : Meta {

    override val items: Map<NameToken, M>

-    override fun getMeta(name: Name): M? {
+    override fun get(name: Name): M? {
        tailrec fun M.find(name: Name): M? = if (name.isEmpty()) {
            this
        } else {
@ -180,28 +174,17 @@ public inline val <M : TypedMeta<M>> TypedMeta<M>.self: M get() = unsafeCast()
 public operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(token: NameToken): M? = this?.items?.get(token)

 /**
- * Perform recursive item search using given [name]. Each [NameToken] is treated as a name in [TypedMeta.items] of a parent node.
+ * Retrieves a meta node with the given name from the nullable [TypedMeta] object.
 *
- * If [name] is empty return current [Meta]
+ * @param name The name of the meta node to retrieve.
+ * @return The meta node with the given name, or null if it doesn't exist.
 */
-public tailrec operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(name: Name): M? = when {
-    this == null -> null
-    name.isEmpty() -> self
-    else -> get(name.firstOrNull()!!)?.get(name.cutFirst())
-}
-
-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun <M : TypedMeta<M>> TypedMeta<M>.get(name: Name): M? = get(name)
+public operator fun <M : TypedMeta<M>> M?.get(name: Name): M? = this?.get(name)

 /**
 * Parse [Name] from [key] using full name notation and pass it to [TypedMeta.get]
 */
-public operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(key: String): M? = this[key.parseAsName(true)]
-
-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun <M : TypedMeta<M>> TypedMeta<M>.get(key: String): M? = get(key)
+public operator fun <M : TypedMeta<M>> M?.get(key: String): M? = this?.get(key.parseAsName(true))


 /**
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt
@ -8,28 +8,28 @@ import kotlin.properties.ReadOnlyProperty
 /* Meta delegates */

 public fun MetaProvider.node(key: Name? = null): ReadOnlyProperty<Any?, Meta?> = ReadOnlyProperty { _, property ->
-    getMeta(key ?: property.name.asName())
+    get(key ?: property.name.asName())
 }

 public fun <T> MetaProvider.node(
    key: Name? = null,
    converter: MetaConverter<T>
 ): ReadOnlyProperty<Any?, T?> = ReadOnlyProperty { _, property ->
-    getMeta(key ?: property.name.asName())?.let { converter.metaToObject(it) }
+    get(key ?: property.name.asName())?.let { converter.metaToObject(it) }
 }

 /**
 * A property delegate that uses custom key
 */
 public fun MetaProvider.value(key: Name? = null): ReadOnlyProperty<Any?, Value?> = ReadOnlyProperty { _, property ->
-    getMeta(key ?: property.name.asName())?.value
+    get(key ?: property.name.asName())?.value
 }

 public fun <R> MetaProvider.value(
    key: Name? = null,
    reader: (Value?) -> R
 ): ReadOnlyProperty<Any?, R> = ReadOnlyProperty { _, property ->
-    reader(getMeta(key ?: property.name.asName())?.value)
+    reader(get(key ?: property.name.asName())?.value)
 }

 //TODO add caching for sealed nodes
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt
@ -11,14 +11,14 @@ import kotlin.js.JsName
 * Mark a meta builder
 */
@DslMarker
-public annotation class MetaBuilder
+public annotation class MetaBuilderMarker

 /**
 * A generic interface that gives access to getting and setting meta notes and values
 */
 public interface MutableMetaProvider : MetaProvider, MutableValueProvider {
-    override fun getMeta(name: Name): MutableMeta?
-    public fun setMeta(name: Name, node: Meta?)
+    override fun get(name: Name): MutableMeta?
+    public operator fun set(name: Name, node: Meta?)
    override fun setValue(name: Name, value: Value?)
 }

@ -27,7 +27,7 @@ public interface MutableMetaProvider : MetaProvider, MutableValueProvider {
 * TODO documentation
 */
@Serializable(MutableMetaSerializer::class)
-@MetaBuilder
+@MetaBuilderMarker
 public interface MutableMeta : Meta, MutableMetaProvider {

    override val items: Map<NameToken, MutableMeta>
@ -37,7 +37,7 @@ public interface MutableMeta : Meta, MutableMetaProvider {
     */
    override var value: Value?

-    override fun getMeta(name: Name): MutableMeta? {
+    override fun get(name: Name): MutableMeta? {
        tailrec fun MutableMeta.find(name: Name): MutableMeta? = if (name.isEmpty()) {
            this
        } else {
@ -83,19 +83,19 @@ public interface MutableMeta : Meta, MutableMetaProvider {
    }

    public infix fun Name.put(meta: Meta) {
-        setMeta(this, meta)
+        set(this, meta)
    }

    public infix fun Name.put(repr: MetaRepr) {
-        setMeta(this, repr.toMeta())
+        set(this, repr.toMeta())
    }

-    public infix fun Name.put(mutableMeta: MutableMeta.() -> Unit) {
-        setMeta(this, Meta(mutableMeta))
+    public infix fun Name.put(builder: MutableMeta.() -> Unit) {
+        getOrCreate(this).apply(builder)
    }

    public infix fun String.put(meta: Meta) {
-        setMeta(Name.parse(this), meta)
+        set(Name.parse(this), meta)
    }

    public infix fun String.put(value: Value?) {
@ -123,7 +123,7 @@ public interface MutableMeta : Meta, MutableMetaProvider {
    }

    public infix fun String.put(repr: MetaRepr) {
-        setMeta(Name.parse(this), repr.toMeta())
+        set(Name.parse(this), repr.toMeta())
    }

    public infix fun String.putIndexed(iterable: Iterable<Meta>) {
@ -131,15 +131,10 @@ public interface MutableMeta : Meta, MutableMetaProvider {
    }

    public infix fun String.put(builder: MutableMeta.() -> Unit) {
-        setMeta(Name.parse(this), MutableMeta(builder))
+        getOrCreate(parseAsName()).apply(builder)
    }
 }

-/**
- * Set or replace node at given [name]
- */
-public operator fun MutableMetaProvider.set(name: Name, meta: Meta): Unit = setMeta(name, meta)
-
 /**
 * Set or replace value at given [name]
 */
@ -154,24 +149,24 @@ public interface MutableTypedMeta<M : MutableTypedMeta<M>> : TypedMeta<M>, Mutab
     */
    @DFExperimental
    public fun attach(name: Name, node: M)
-    override fun getMeta(name: Name): M?
+    override fun get(name: Name): M?
    override fun getOrCreate(name: Name): M
 }

 public fun <M : MutableTypedMeta<M>> M.getOrCreate(key: String): M = getOrCreate(Name.parse(key))

 public fun MutableMetaProvider.remove(name: Name) {
-    setMeta(name, null)
+    set(name, null)
 }

 public fun MutableMetaProvider.remove(key: String) {
-    setMeta(Name.parse(key), null)
+    set(Name.parse(key), null)
 }

 // node setters

-public operator fun MutableMetaProvider.set(Key: NameToken, value: Meta): Unit = setMeta(Key.asName(), value)
-public operator fun MutableMetaProvider.set(key: String, value: Meta): Unit = setMeta(Name.parse(key), value)
+public operator fun MutableMetaProvider.set(Key: NameToken, value: Meta): Unit = set(Key.asName(), value)
+public operator fun MutableMetaProvider.set(key: String, value: Meta): Unit = set(Name.parse(key), value)


 //public fun MutableMeta.set(key: String, index: String, value: Value?): Unit =
@ -319,7 +314,7 @@ private class MutableMetaImpl(
        )

    @ThreadSafe
-    override fun setMeta(name: Name, node: Meta?) {
+    override fun set(name: Name, node: Meta?) {
        val oldItem: ObservableMutableMeta? = get(name)
        if (oldItem != node) {
            when (name.length) {
@ -346,7 +341,7 @@ private class MutableMetaImpl(
                        newNode.adoptBy(this, token)
                        children[token] = newNode
                    }
-                    items[token]?.setMeta(name.cutFirst(), node)
+                    items[token]?.set(name.cutFirst(), node)
                }
            }
            invalidate(name)
@ -381,16 +376,14 @@ public fun Meta.toMutableMeta(): ObservableMutableMeta = MutableMetaImpl(value,

 public fun Meta.asMutableMeta(): MutableMeta = (this as? MutableMeta) ?: toMutableMeta()

-@Suppress("FunctionName")
-@JsName("newMutableMeta")
-public fun MutableMeta(): ObservableMutableMeta = MutableMetaImpl(null)
+@JsName("newObservableMutableMeta")
+public fun ObservableMutableMeta(): ObservableMutableMeta = MutableMetaImpl(null)

 /**
 * Build a [MutableMeta] using given transformation
 */
-@Suppress("FunctionName")
-public inline fun MutableMeta(builder: MutableMeta.() -> Unit = {}): ObservableMutableMeta =
-    MutableMeta().apply(builder)
+public inline fun ObservableMutableMeta(builder: MutableMeta.() -> Unit = {}): ObservableMutableMeta =
+    ObservableMutableMeta().apply(builder)


 /**
@ -407,7 +400,7 @@ private class MutableMetaWithDefault(
    override val items: Map<NameToken, MutableMeta>
        get() {
            val sourceKeys: Collection<NameToken> = source[rootName]?.items?.keys ?: emptyList()
-            val defaultKeys: Collection<NameToken> = default.getMeta(rootName)?.items?.keys ?: emptyList()
+            val defaultKeys: Collection<NameToken> = default[rootName]?.items?.keys ?: emptyList()
            //merging keys for primary and default node
            return (sourceKeys + defaultKeys).associateWith {
                MutableMetaWithDefault(source, default, rootName + it)
@ -415,12 +408,12 @@ private class MutableMetaWithDefault(
        }

    override var value: Value?
-        get() = source[rootName]?.value ?: default.getMeta(rootName)?.value
+        get() = source[rootName]?.value ?: default.get(rootName)?.value
        set(value) {
            source[rootName] = value
        }

-    override fun getMeta(name: Name): MutableMeta = MutableMetaWithDefault(source, default, rootName + name)
+    override fun get(name: Name): MutableMeta = MutableMetaWithDefault(source, default, rootName + name)

    override fun toString(): String = Meta.toString(this)
    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMetaDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMetaDelegate.kt
@ -11,31 +11,31 @@ import kotlin.reflect.KProperty
 public fun MutableMetaProvider.node(key: Name? = null): ReadWriteProperty<Any?, Meta?> =
    object : ReadWriteProperty<Any?, Meta?> {
        override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? {
-            return getMeta(key ?: property.name.asName())
+            return get(key ?: property.name.asName())
        }

        override fun setValue(thisRef: Any?, property: KProperty<*>, value: Meta?) {
            val name = key ?: property.name.asName()
-            setMeta(name, value)
+            set(name, value)
        }
    }

 public fun <T> MutableMetaProvider.node(key: Name? = null, converter: MetaConverter<T>): ReadWriteProperty<Any?, T?> =
    object : ReadWriteProperty<Any?, T?> {
        override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
-            return getMeta(key ?: property.name.asName())?.let { converter.metaToObject(it) }
+            return get(key ?: property.name.asName())?.let { converter.metaToObject(it) }
        }

        override fun setValue(thisRef: Any?, property: KProperty<*>, value: T?) {
            val name = key ?: property.name.asName()
-            setMeta(name, value?.let { converter.objectToMeta(it) })
+            set(name, value?.let { converter.objectToMeta(it) })
        }
    }

 public fun MutableMetaProvider.value(key: Name? = null): ReadWriteProperty<Any?, Value?> =
    object : ReadWriteProperty<Any?, Value?> {
        override fun getValue(thisRef: Any?, property: KProperty<*>): Value? =
-            getMeta(key ?: property.name.asName())?.value
+            get(key ?: property.name.asName())?.value

        override fun setValue(thisRef: Any?, property: KProperty<*>, value: Value?) {
            setValue(key ?: property.name.asName(), value)
@ -48,7 +48,7 @@ public fun <T> MutableMetaProvider.value(
    reader: (Value?) -> T
 ): ReadWriteProperty<Any?, T> = object : ReadWriteProperty<Any?, T> {
    override fun getValue(thisRef: Any?, property: KProperty<*>): T =
-        reader(getMeta(key ?: property.name.asName())?.value)
+        reader(get(key ?: property.name.asName())?.value)

    override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
        setValue(key ?: property.name.asName(), writer(value))
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMeta.kt
@ -36,7 +36,7 @@ public interface ObservableMeta : Meta {
 public interface ObservableMutableMeta : ObservableMeta, MutableMeta, MutableTypedMeta<ObservableMutableMeta> {
    override fun getOrCreate(name: Name): ObservableMutableMeta

-    override fun getMeta(name: Name): ObservableMutableMeta? {
+    override fun get(name: Name): ObservableMutableMeta? {
        tailrec fun ObservableMutableMeta.find(name: Name): ObservableMutableMeta? = if (name.isEmpty()) {
            this
        } else {
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
@ -17,8 +17,8 @@ private class ObservableMetaWrapper(
            ObservableMetaWrapper(root, absoluteName + it, listeners)
        }

-    override fun getMeta(name: Name): ObservableMutableMeta? =
-        root.getMeta(name)?.let { ObservableMetaWrapper(root, this.absoluteName + name, listeners) }
+    override fun get(name: Name): ObservableMutableMeta? =
+        root.get(name)?.let { ObservableMetaWrapper(root, this.absoluteName + name, listeners) }

    @ThreadSafe
    override fun onChange(owner: Any?, callback: Meta.(name: Name) -> Unit) {
@ -49,9 +49,11 @@ private class ObservableMetaWrapper(
    override fun getOrCreate(name: Name): ObservableMutableMeta =
        ObservableMetaWrapper(root, this.absoluteName + name, listeners)

-    override fun setMeta(name: Name, node: Meta?) {
+    override fun set(name: Name, node: Meta?) {
        val oldMeta = get(name)
-        root.setMeta(absoluteName + name, node)
+        //don't forget to remove listener
+        oldMeta?.removeListener(this)
+        root.set(absoluteName + name, node)
        if (oldMeta != node) {
            invalidate(name)
        }
@ -67,7 +69,7 @@ private class ObservableMetaWrapper(
    override fun attach(name: Name, node: ObservableMutableMeta) {
        set(name, node)
        node.onChange(this) { changeName ->
-            setMeta(name + changeName, this[changeName])
+            set(name + changeName, this[changeName])
        }
    }
 }
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Scheme.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Scheme.kt
@ -47,11 +47,11 @@ public open class Scheme : Described, MetaRepr, MutableMetaProvider, Configurabl
        return descriptor?.validate(meta) ?: true
    }

-    override fun getMeta(name: Name): MutableMeta? = meta.getMeta(name)
+    override fun get(name: Name): MutableMeta? = meta.get(name)

-    override fun setMeta(name: Name, node: Meta?) {
+    override fun set(name: Name, node: Meta?) {
        if (validate(name, meta)) {
-            meta.setMeta(name, node)
+            meta.set(name, node)
        } else {
            error("Validation failed for node $node at $name")
        }
@ -110,8 +110,8 @@ public open class Scheme : Described, MetaRepr, MutableMetaProvider, Configurabl
        override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
        override fun hashCode(): Int = Meta.hashCode(this)

-        override fun setMeta(name: Name, node: Meta?) {
-            targetMeta.setMeta(name, node)
+        override fun set(name: Name, node: Meta?) {
+            targetMeta.set(name, node)
            invalidate(name)
        }

@ -120,9 +120,9 @@ public open class Scheme : Described, MetaRepr, MutableMetaProvider, Configurabl
        @DFExperimental
        override fun attach(name: Name, node: ObservableMutableMeta) {
            //TODO implement zero-copy attachment
-            setMeta(name, node)
+            set(name, node)
            node.onChange(this) { changeName ->
-                setMeta(name + changeName, this[changeName])
+                set(name + changeName, this[changeName])
            }
        }

--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
@ -1,16 +1,17 @@
 package space.kscience.dataforge.meta

 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.names.NameToken
+import space.kscience.dataforge.names.*
+import kotlin.js.JsName

 /**
 * The meta implementation which is guaranteed to be immutable.
 *
 */
@Serializable
-public class SealedMeta internal constructor(
+public class SealedMeta(
    override val value: Value?,
-    override val items: Map<NameToken, SealedMeta>
+    override val items: Map<NameToken, SealedMeta>,
 ) : TypedMeta<SealedMeta> {
    override fun toString(): String = Meta.toString(this)
    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
@ -26,7 +27,7 @@ public class SealedMeta internal constructor(
 }

 /**
- * Generate sealed node from [this]. If it is already sealed return it as is.
+ * Generate sealed node from [this]. If it is already sealed, return it as is.
 */
 public fun Meta.seal(): SealedMeta = this as? SealedMeta ?: SealedMeta(
    value,
@ -47,7 +48,79 @@ public fun Meta(value: String): SealedMeta = Meta(value.asValue())
@Suppress("FunctionName")
 public fun Meta(value: Boolean): SealedMeta = Meta(value.asValue())

-@Suppress("FunctionName")
-public inline fun Meta(builder: MutableMeta.() -> Unit): SealedMeta =
-    MutableMeta(builder).seal()

+/**
+ * A lightweight mutable meta without an observability
+ */
+@PublishedApi
+internal class MetaBuilder(
+    override var value: Value? = null,
+    override val items: MutableMap<NameToken, MetaBuilder> = hashMapOf(),
+) : MutableMeta {
+
+    override fun getOrCreate(name: Name): MetaBuilder {
+        val existing = get(name) as? MetaBuilder
+        return if (existing == null) {
+            val newItem = MetaBuilder()
+            set(name, newItem)
+            newItem
+        } else {
+            existing
+        }
+    }
+
+    private fun wrap(meta: Meta): MetaBuilder = meta as? MetaBuilder ?: MetaBuilder(
+        meta.value,
+        meta.items.mapValuesTo(hashMapOf()) { wrap(it.value) }
+    )
+
+
+    override fun set(name: Name, node: Meta?) {
+        when (name.length) {
+            0 -> error("Can't set a meta with empty name")
+            1 -> {
+                val token = name.first()
+                //remove child and invalidate if argument is null
+                if (node == null) {
+                    items.remove(token)
+                } else {
+                    items[token] = wrap(node)
+                }
+            }
+
+            else -> {
+                getOrCreate(name.first().asName()).set(name.cutFirst(), node)
+            }
+        }
+    }
+
+    override fun toString(): String = Meta.toString(this)
+
+    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
+
+    override fun hashCode(): Int = Meta.hashCode(this)
+}
+
+/**
+ * Create a read-only meta.
+ */
+public inline fun Meta(builder: MutableMeta.() -> Unit): Meta =
+    MetaBuilder().apply(builder).seal()
+
+/**
+ * Create an immutable meta.
+ */
+public inline fun SealedMeta(builder: MutableMeta.() -> Unit): SealedMeta =
+    MetaBuilder().apply(builder).seal()
+
+/**
+ * Create an empty meta mutable meta.
+ */
+@JsName("newMutableMeta")
+public fun MutableMeta(): MutableMeta = MetaBuilder()
+
+/**
+ * Create a mutable meta with given builder.
+ */
+public inline fun MutableMeta(builder: MutableMeta.() -> Unit = {}): MutableMeta =
+    MutableMeta().apply(builder)
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Value.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Value.kt
@ -64,6 +64,7 @@ public interface Value {
                        ListValue(list)
                    }
                }
+
                is DoubleArray -> value.asValue()
                is IntArray -> value.asValue()
                is FloatArray -> value.asValue()
@ -76,6 +77,41 @@ public interface Value {
                else -> throw IllegalArgumentException("Unrecognized type of the object (${value::class}) converted to Value")
            }
        }
+
+        /**
+         * Parse value from string. Double-quoted strings are parsed literally. true/false are parsed as booleans
+         */
+        public fun parse(string: String): Value {
+
+            //Trying to get integer
+            if (string.isEmpty() || string == Null.string) {
+                return Null
+            }
+
+            //string constants
+            if (string.startsWith("\"") && string.endsWith("\"")) {
+                return StringValue(string.substring(1, string.length - 2))
+            }
+
+            string.toIntOrNull()?.let {
+                return NumberValue(it)
+            }
+
+            string.toDoubleOrNull()?.let {
+                return NumberValue(it)
+            }
+
+            if ("true" == string) {
+                return True
+            }
+
+            if ("false" == string) {
+                return False
+            }
+
+            //Give up and return a StringValue
+            return StringValue(string)
+        }
    }
 }

@ -140,7 +176,7 @@ public class NumberValue(public val number: Number) : Value {

        val otherNumber = other.numberOrNull ?: return false

-        if(number == otherNumber) return true
+        if (number == otherNumber) return true

        //Do not change the order of comparison. On JS number is the instance of all types
        return when (numberOrNull) {
@ -228,34 +264,5 @@ public fun <E : Enum<E>> E.asValue(): Value = EnumValue(this)
 /**
 * Create Value from String using the closest match conversion
 */
-public fun String.parseValue(): Value {
-
-    //Trying to get integer
-    if (isEmpty() || this == Null.string) {
-        return Null
-    }
-
-    //string constants
-    if (startsWith("\"") && endsWith("\"")) {
-        return StringValue(substring(1, length - 2))
-    }
-
-    toIntOrNull()?.let {
-        return NumberValue(it)
-    }
-
-    toDoubleOrNull()?.let {
-        return NumberValue(it)
-    }
-
-    if ("true" == this) {
-        return True
-    }
-
-    if ("false" == this) {
-        return False
-    }
-
-    //Give up and return a StringValue
-    return StringValue(this)
-}
+@Deprecated("Use Value.parse(this) instead", ReplaceWith("Value.parse(this)"))
+public fun String.parseValue(): Value = Value.parse(this)
--- 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
@ -7,7 +7,7 @@ import space.kscience.dataforge.names.*
 /**
 * Restrictions on value in the node
 */
-public enum class ValueRequirement {
+public enum class ValueRestriction {
    /**
     * No restrictions
     */
@ -26,26 +26,25 @@ public enum class ValueRequirement {

 /**
 * The descriptor for a meta
- * @param info description text
+ * @param description description text
 * @param children child descriptors for this node
 * @param multiple True if same name siblings with this name are allowed
- * @param valueRequirement The requirements for node content
+ * @param valueRestriction The requirements for node content
 * @param valueTypes list of allowed types for [Meta.value], null if all values are allowed.
 *  Empty list means that no value should be present in this node.
 * @param indexKey An index field by which this node is identified in case of same name siblings construct
 * @param defaultValue the default [Meta.value] for the node
- * @param attributes additional attributes of this descriptor. For example validation and widget parameters
+ * @param attributes additional attributes of this descriptor. For example, validation and widget parameters
 */
@Serializable
 public data class MetaDescriptor(
-    public val info: String? = null,
+    public val description: String? = null,
    public val children: Map<String, MetaDescriptor> = emptyMap(),
    public val multiple: Boolean = false,
-    public val valueRequirement: ValueRequirement = ValueRequirement.NONE,
+    public val valueRestriction: ValueRestriction = ValueRestriction.NONE,
    public val valueTypes: List<ValueType>? = null,
    public val indexKey: String = Meta.INDEX_KEY,
    public val defaultValue: Value? = null,
-    public val readOnly: Boolean = false,
    public val attributes: Meta = Meta.EMPTY,
 ) {
    /**
@ -63,11 +62,12 @@ public data class MetaDescriptor(
    }

    public companion object {
+        public val EMPTY: MetaDescriptor = MetaDescriptor("Generic meta tree")
        internal const val ALLOWED_VALUES_KEY = "allowedValues"
    }
 }

-public val MetaDescriptor.required: Boolean get() = valueRequirement == ValueRequirement.REQUIRED || children.values.any { required }
+public val MetaDescriptor.required: Boolean get() = valueRestriction == ValueRestriction.REQUIRED || children.values.any { required }

 public val MetaDescriptor.allowedValues: List<Value>? get() = attributes[MetaDescriptor.ALLOWED_VALUES_KEY]?.value?.list

@ -80,9 +80,9 @@ public operator fun MetaDescriptor.get(name: Name): MetaDescriptor? = when (name
 public operator fun MetaDescriptor.get(name: String): MetaDescriptor? = get(name.parseAsName(true))

 public fun MetaDescriptor.validate(value: Value?): Boolean = if (value == null) {
-    valueRequirement != ValueRequirement.REQUIRED
+    valueRestriction != ValueRestriction.REQUIRED
 } else {
-    if (valueRequirement == ValueRequirement.ABSENT) false
+    if (valueRestriction == ValueRestriction.ABSENT) false
    else {
        (valueTypes == null || value.type in valueTypes) && (allowedValues?.let { value in it } ?: true)
    }
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder.kt
@ -12,16 +12,22 @@ public class MetaDescriptorBuilder  @PublishedApi internal constructor() {
    public var info: String? = null
    public var children: MutableMap<String, MetaDescriptorBuilder> = linkedMapOf()
    public var multiple: Boolean = false
-    public var valueRequirement: ValueRequirement = ValueRequirement.NONE
-    public var readOnly: Boolean = false
+    public var valueRestriction: ValueRestriction = ValueRestriction.NONE

-    public var type: List<ValueType>? = null
+    public var valueTypes: List<ValueType>? = null

-    public fun type(primaryType: ValueType, vararg otherTypes: ValueType) {
-        type = listOf(primaryType, *otherTypes)
+    public fun valueType(primaryType: ValueType, vararg otherTypes: ValueType) {
+        valueTypes = listOf(primaryType, *otherTypes)
    }

+    /**
+     * A key for indexing values. Should be changed in case of the name clash.
+     */
    public var indexKey: String = Meta.INDEX_KEY
+
+    /**
+     * The default value
+     */
    public var default: Value? = null

    public fun default(value: Any?) {
@ -42,6 +48,7 @@ public class MetaDescriptorBuilder  @PublishedApi internal constructor() {
                children[name.first().body] = target
                target
            }
+
            else -> {
                children.getOrPut(name.first().body) { MetaDescriptorBuilder() }.item(name.cutFirst(), block)
            }
@ -51,16 +58,17 @@ public class MetaDescriptorBuilder  @PublishedApi internal constructor() {
    public fun node(
        name: Name,
        descriptor: MetaDescriptor,
-        block: MetaDescriptorBuilder.() -> Unit = {}
+        block: MetaDescriptorBuilder.() -> Unit = {},
    ): MetaDescriptorBuilder = when (name.length) {
        0 -> error("Can't set descriptor to root")
        1 -> {
            val item = descriptor.toBuilder().apply {
-                valueRequirement = ValueRequirement.ABSENT
+                valueRestriction = ValueRestriction.ABSENT
            }.apply(block)
            children[name.first().body] = item
            item
        }
+
        else -> children.getOrPut(name.first().body) {
            MetaDescriptorBuilder()
        }.node(name.cutFirst(), descriptor, block)
@ -79,14 +87,13 @@ public class MetaDescriptorBuilder  @PublishedApi internal constructor() {

    @PublishedApi
    internal fun build(): MetaDescriptor = MetaDescriptor(
-        info = info,
+        description = info,
        children = children.mapValues { it.value.build() },
        multiple = multiple,
-        valueRequirement = valueRequirement,
-        valueTypes = type,
+        valueRestriction = valueRestriction,
+        valueTypes = valueTypes,
        indexKey = indexKey,
        defaultValue = default,
-        readOnly = readOnly,
        attributes = attributes
    )
 }
@ -104,9 +111,9 @@ public fun MetaDescriptorBuilder.value(
    name: Name,
    type: ValueType,
    vararg additionalTypes: ValueType,
-    block: MetaDescriptorBuilder.() -> Unit = {}
+    block: MetaDescriptorBuilder.() -> Unit = {},
 ): MetaDescriptorBuilder = item(name) {
-    type(type, *additionalTypes)
+    valueType(type, *additionalTypes)
    block()
 }

@ -114,16 +121,16 @@ public fun MetaDescriptorBuilder.value(
    name: String,
    type: ValueType,
    vararg additionalTypes: ValueType,
-    block: MetaDescriptorBuilder.() -> Unit = {}
+    block: MetaDescriptorBuilder.() -> Unit = {},
 ): MetaDescriptorBuilder = value(Name.parse(name), type, additionalTypes = additionalTypes, block)

 /**
 * Create and configure child value descriptor
 */
 public fun MetaDescriptorBuilder.node(
-    name: Name, block: MetaDescriptorBuilder.() -> Unit
+    name: Name, block: MetaDescriptorBuilder.() -> Unit,
 ): MetaDescriptorBuilder = item(name) {
-    valueRequirement = ValueRequirement.ABSENT
+    valueRestriction = ValueRestriction.ABSENT
    block()
 }

@ -142,7 +149,7 @@ public fun MetaDescriptorBuilder.node(
 }

 public fun MetaDescriptorBuilder.required() {
-    valueRequirement = ValueRequirement.REQUIRED
+    valueRestriction = ValueRestriction.REQUIRED
 }

 public inline fun <reified E : Enum<E>> MetaDescriptorBuilder.enum(
@ -158,11 +165,11 @@ public inline fun <reified E : Enum<E>> MetaDescriptorBuilder.enum(
 }

 private fun MetaDescriptor.toBuilder(): MetaDescriptorBuilder = MetaDescriptorBuilder().apply {
-    info = this@toBuilder.info
+    info = this@toBuilder.description
    children = this@toBuilder.children.mapValuesTo(LinkedHashMap()) { it.value.toBuilder() }
    multiple = this@toBuilder.multiple
-    valueRequirement = this@toBuilder.valueRequirement
-    type = this@toBuilder.valueTypes
+    valueRestriction = this@toBuilder.valueRestriction
+    valueTypes = this@toBuilder.valueTypes
    indexKey = this@toBuilder.indexKey
    default = defaultValue
    attributes = this@toBuilder.attributes.toMutableMeta()
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/exoticValues.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/exoticValues.kt
@ -5,7 +5,7 @@ package space.kscience.dataforge.meta
 * A value built from string which content and type are parsed on-demand
 */
 public class LazyParsedValue(public val string: String) : Value {
-    private val parsedValue by lazy { string.parseValue() }
+    private val parsedValue by lazy { Value.parse(string) }

    override val value: Any? get() = parsedValue.value
    override val type: ValueType get() = parsedValue.type
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaConverter.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaConverter.kt
@ -1,79 +1,155 @@
 package space.kscience.dataforge.meta.transformations

 import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import kotlin.reflect.KType
+import kotlin.reflect.typeOf

 /**
 * A converter of generic object to and from [Meta]
 */
 public interface MetaConverter<T> {
-    public fun metaToObject(meta: Meta): T?
+
+    /**
+     * Runtime type of [T]
+     */
+    public val type: KType
+
+    /**
+     * A descriptor for resulting meta
+     */
+    public val descriptor: MetaDescriptor get() = MetaDescriptor.EMPTY
+
+    /**
+     * Attempt conversion of [meta] to an object or return null if conversion failed
+     */
+    public fun metaToObjectOrNull(meta: Meta): T?
+
+    public fun metaToObject(meta: Meta): T =
+        metaToObjectOrNull(meta) ?: error("Meta $meta could not be interpreted by $this")
+
    public fun objectToMeta(obj: T): Meta

    public companion object {

        public val meta: MetaConverter<Meta> = object : MetaConverter<Meta> {
-            override fun metaToObject(meta: Meta): Meta = meta
+            override val type: KType = typeOf<Meta>()
+
+            override fun metaToObjectOrNull(meta: Meta): Meta = meta
            override fun objectToMeta(obj: Meta): Meta = obj
        }

        public val value: MetaConverter<Value> = object : MetaConverter<Value> {
-            override fun metaToObject(meta: Meta): Value? = meta.value
+            override val type: KType = typeOf<Value>()
+
+            override fun metaToObjectOrNull(meta: Meta): Value? = meta.value
            override fun objectToMeta(obj: Value): Meta = Meta(obj)
        }

        public val string: MetaConverter<String> = object : MetaConverter<String> {
-            override fun metaToObject(meta: Meta): String? = meta.string
+            override val type: KType = typeOf<String>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.STRING)
+            }
+
+
+            override fun metaToObjectOrNull(meta: Meta): String? = meta.string
            override fun objectToMeta(obj: String): Meta = Meta(obj.asValue())
        }

        public val boolean: MetaConverter<Boolean> = object : MetaConverter<Boolean> {
-            override fun metaToObject(meta: Meta): Boolean? = meta.boolean
+            override val type: KType = typeOf<Boolean>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.BOOLEAN)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Boolean? = meta.boolean
            override fun objectToMeta(obj: Boolean): Meta = Meta(obj.asValue())
        }

        public val number: MetaConverter<Number> = object : MetaConverter<Number> {
-            override fun metaToObject(meta: Meta): Number? = meta.number
+            override val type: KType = typeOf<Number>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Number? = meta.number
            override fun objectToMeta(obj: Number): Meta = Meta(obj.asValue())
        }

        public val double: MetaConverter<Double> = object : MetaConverter<Double> {
-            override fun metaToObject(meta: Meta): Double? = meta.double
+            override val type: KType = typeOf<Double>()

+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Double? = meta.double
            override fun objectToMeta(obj: Double): Meta = Meta(obj.asValue())
        }

        public val float: MetaConverter<Float> = object : MetaConverter<Float> {
-            override fun metaToObject(meta: Meta): Float? = meta.float
+            override val type: KType = typeOf<Float>()

+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Float? = meta.float
            override fun objectToMeta(obj: Float): Meta = Meta(obj.asValue())
        }

        public val int: MetaConverter<Int> = object : MetaConverter<Int> {
-            override fun metaToObject(meta: Meta): Int? = meta.int
+            override val type: KType = typeOf<Int>()

+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Int? = meta.int
            override fun objectToMeta(obj: Int): Meta = Meta(obj.asValue())
        }

        public val long: MetaConverter<Long> = object : MetaConverter<Long> {
-            override fun metaToObject(meta: Meta): Long? = meta.long
+            override val type: KType = typeOf<Long>()

+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Long? = meta.long
            override fun objectToMeta(obj: Long): Meta = Meta(obj.asValue())
        }

        public inline fun <reified E : Enum<E>> enum(): MetaConverter<E> = object : MetaConverter<E> {
+            override val type: KType = typeOf<E>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.STRING)
+                allowedValues(enumValues<E>())
+            }
+
            @Suppress("USELESS_CAST")
-            override fun metaToObject(meta: Meta): E = meta.enum<E>() as? E ?: error("The Item is not a Enum")
+            override fun metaToObjectOrNull(meta: Meta): E = meta.enum<E>() as? E ?: error("The Item is not a Enum")

            override fun objectToMeta(obj: E): Meta = Meta(obj.asValue())
        }

        public fun <T> valueList(
            writer: (T) -> Value = { Value.of(it) },
-            reader: (Value) -> T
+            reader: (Value) -> T,
        ): MetaConverter<List<T>> =
            object : MetaConverter<List<T>> {
-                override fun metaToObject(meta: Meta): List<T> =
-                    meta.value?.list?.map(reader) ?: error("The item is not a value list")
+                override val type: KType = typeOf<List<T>>()
+
+                override val descriptor: MetaDescriptor = MetaDescriptor {
+                    valueType(ValueType.LIST)
+                }
+
+                override fun metaToObjectOrNull(meta: Meta): List<T>? = meta.value?.list?.map(reader)

                override fun objectToMeta(obj: List<T>): Meta = Meta(obj.map(writer).asValue())
            }
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaTransformation.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaTransformation.kt
@ -42,7 +42,7 @@ public data class KeepTransformationRule(val selector: (Name) -> Boolean) :
        meta.nodeSequence().map { it.first }.filter(selector)

    override fun transformItem(name: Name, item: Meta?, target: MutableMeta) {
-        if (selector(name)) target.setMeta(name, item)
+        if (selector(name)) target.set(name, item)
    }
 }

@ -105,7 +105,7 @@ public value class MetaTransformation(private val transformations: Collection<Tr
     * Generate an observable configuration that contains only elements defined by transformation rules and changes with the source
     */
    @DFExperimental
-    public fun generate(source: ObservableMeta): ObservableMeta = MutableMeta().apply {
+    public fun generate(source: ObservableMeta): ObservableMeta = ObservableMutableMeta{
        transformations.forEach { rule ->
            rule.selectItems(source).forEach { name ->
                rule.transformItem(name, source[name], this)
@ -174,7 +174,7 @@ public class MetaTransformationBuilder {
    public fun keep(regex: String) {
        transformations.add(
            RegexItemTransformationRule(regex.toRegex()) { name, _, Meta ->
-                setMeta(name, Meta)
+                set(name, Meta)
            })
    }

@ -184,7 +184,7 @@ public class MetaTransformationBuilder {
    public fun move(from: Name, to: Name, operation: (Meta?) -> Meta? = { it }) {
        transformations.add(
            SingleItemTransformationRule(from) { _, item ->
-                setMeta(to, operation(item))
+                set(to, operation(item))
            }
        )
    }
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/misc/DfId.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/misc/DfId.kt
@ -2,9 +2,7 @@ package space.kscience.dataforge.misc

 /**
 * A text label for internal DataForge type classification. Alternative for mime container type.
- *
- * The DataForge type notation presumes that type `A.B.C` is the subtype of `A.B`
 */
@MustBeDocumented
@Target(AnnotationTarget.CLASS)
-public annotation class Type(val id: String)
+public annotation class DfId(val id: String)
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/Name.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/Name.kt
@ -134,6 +134,11 @@ public val Name.length: Int get() = tokens.size
 */
 public fun Name.lastOrNull(): NameToken? = tokens.lastOrNull()

+/**
+ * Last token or throw exception
+ */
+public fun Name.last(): NameToken = tokens.last()
+
 /**
 * First token of the name or null if it is empty
 */
--- a/dataforge-meta/src/jvmTest/kotlin/space/kscience/dataforge/meta/JvmMutableMetaTest.kt
+++ b/dataforge-meta/src/jvmTest/kotlin/space/kscience/dataforge/meta/JvmMutableMetaTest.kt
@ -1,15 +0,0 @@
-package space.kscience.dataforge.meta
-
-import org.junit.jupiter.api.Test
-import kotlin.test.assertFails
-
-class JvmMutableMetaTest {
-    @Test
-    fun recursiveMeta(){
-        val meta = MutableMeta {
-            "a" put 2
-        }
-
-        assertFails { meta["child.a"] = meta }
-    }
-}
--- a/dataforge-scripting/README.md
+++ b/dataforge-scripting/README.md
@ -6,27 +6,18 @@

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.7.0`.

-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-scripting:0.6.2-dev-2'
-}
-```
 **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:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-scripting:0.7.0")
 }
 ```
--- a/dataforge-workspace/README.md
+++ b/dataforge-workspace/README.md
@ -6,27 +6,18 @@

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.7.0`.

-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-workspace:0.6.2-dev-2'
-}
-```
 **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:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-workspace:0.7.0")
 }
 ```
--- a/dataforge-workspace/build.gradle.kts
+++ b/dataforge-workspace/build.gradle.kts
@ -10,15 +10,19 @@ kscience{
    useSerialization{
        protobuf()
    }
+    commonMain{
        dependencies {
            api(projects.dataforgeContext)
            api(projects.dataforgeData)
            api(projects.dataforgeIo)
        }
-    dependencies(jvmTest){
+    }
+    jvmTest{
+        dependencies {
            implementation(spclibs.logback.classic)
            implementation(projects.dataforgeIo.dataforgeIoYaml)
        }
+    }
 }

 readme{
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt
@ -9,7 +9,7 @@ import space.kscience.dataforge.meta.MetaRepr
 import space.kscience.dataforge.meta.Specification
 import space.kscience.dataforge.meta.descriptors.Described
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.workspace.Task.Companion.TYPE
 import kotlin.reflect.KType
@ -19,7 +19,7 @@ import kotlin.reflect.typeOf
 * A configurable task that could be executed on a workspace. The [TaskResult] represents a lazy result of the task.
 * In general no computations should be made until the result is called.
 */
-@Type(TYPE)
+@DfId(TYPE)
 public interface Task<out T : Any> : Described {

    /**
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Workspace.kt
@ -6,7 +6,7 @@ import space.kscience.dataforge.data.DataSet
 import space.kscience.dataforge.data.asSequence
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MutableMeta
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.provider.Provider

@ -18,7 +18,7 @@ public interface DataSelector<T: Any>{
 /**
 * An environment for pull-mode computation
 */
-@Type(Workspace.TYPE)
+@DfId(Workspace.TYPE)
 public interface Workspace : ContextAware, Provider {
    /**
     * The whole data node for current workspace
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
@ -33,9 +33,12 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
    dependencyMeta: Meta = defaultDependencyMeta,
    selectorBuilder: P.() -> TaskReference<T>,
 ): DataSet<T> {
-    require(workspace.context.plugins.contains(plugin)){"Plugin $plugin is not loaded into $workspace"}
+    require(workspace.context.plugins.contains(plugin)) { "Plugin $plugin is not loaded into $workspace" }
    val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO add explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return  res as TaskResult<T>
 }

 /**
@ -45,7 +48,7 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
 * @param dependencyMeta meta used for selector. The same meta is used for caching. By default, uses [defaultDependencyMeta].
 * @param selectorBuilder a builder of task from the plugin.
 */
-public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
+public suspend inline fun <reified T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
    pluginFactory: PluginFactory<P>,
    dependencyMeta: Meta = defaultDependencyMeta,
    selectorBuilder: P.() -> TaskReference<T>,
@ -53,7 +56,10 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
    val plugin = workspace.context.plugins[pluginFactory]
        ?: error("Plugin ${pluginFactory.tag} not loaded into workspace context")
    val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return res as TaskResult<T>
 }

 public val TaskResultBuilder<*>.allData: DataSelector<*>
--- a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt
@ -1,9 +1,6 @@
 package space.kscience.dataforge.workspace

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.readBytes
-import io.ktor.utils.io.core.writeFully
+import kotlinx.io.*
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.json.Json
@ -30,10 +27,10 @@ public class JsonIOFormat<T : Any>(override val type: KType) : IOFormat<T> {
    @Suppress("UNCHECKED_CAST")
    private val serializer: KSerializer<T> = serializer(type) as KSerializer<T>

-    override fun readObject(input: Input): T = Json.decodeFromString(serializer, input.readUtf8String())
+    override fun readFrom(source: Source): T = Json.decodeFromString(serializer, source.readString())

-    override fun writeObject(output: Output, obj: T) {
-        output.writeUtf8String(Json.encodeToString(serializer, obj))
+    override fun writeTo(sink: Sink, obj: T) {
+        sink.writeString(Json.encodeToString(serializer, obj))
    }
 }

@ -43,10 +40,10 @@ public class ProtobufIOFormat<T : Any>(override val type: KType) : IOFormat<T> {
    @Suppress("UNCHECKED_CAST")
    private val serializer: KSerializer<T> = serializer(type) as KSerializer<T>

-    override fun readObject(input: Input): T = ProtoBuf.decodeFromByteArray(serializer, input.readBytes())
+    override fun readFrom(source: Source): T = ProtoBuf.decodeFromByteArray(serializer, source.readByteArray())

-    override fun writeObject(output: Output, obj: T) {
-        output.writeFully(ProtoBuf.encodeToByteArray(serializer, obj))
+    override fun writeTo(sink: Sink, obj: T) {
+        sink.write(ProtoBuf.encodeToByteArray(serializer, obj))
    }
 }

@ -88,7 +85,7 @@ public class FileWorkspaceCache(public val cacheDirectory: Path) : WorkspaceCach
                    val envelope = Envelope {
                        meta = data.meta
                        data {
-                            writeObject(format, result)
+                            writeWith(format, result)
                        }
                    }
                    io.writeEnvelopeFile(path, envelope)
--- a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/zipData.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/zipData.kt
@ -1,13 +1,10 @@
 package space.kscience.dataforge.workspace

-import io.ktor.utils.io.streams.asOutput
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import space.kscience.dataforge.data.DataTree
 import space.kscience.dataforge.data.DataTreeItem
-import space.kscience.dataforge.io.EnvelopeFormat
-import space.kscience.dataforge.io.IOFormat
-import space.kscience.dataforge.io.TaggedEnvelopeFormat
+import space.kscience.dataforge.io.*
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files
 import java.nio.file.Path
@ -28,11 +25,15 @@ private suspend fun <T : Any> ZipOutputStream.writeNode(
            val envelope = treeItem.data.toEnvelope(dataFormat)
            val entry = ZipEntry(name)
            putNextEntry(entry)
-            asOutput().run {
-                envelopeFormat.writeObject(this, envelope)
-                flush()
+
+            //TODO remove additional copy
+            val bytes = ByteArray {
+                writeWith(envelopeFormat, envelope)
            }
+            write(bytes)
+
        }
+
        is DataTreeItem.Node -> {
            val entry = ZipEntry("$name/")
            putNextEntry(entry)
--- a/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt
+++ b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt
@ -1,12 +1,18 @@
 package space.kscience.dataforge.workspace

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
 import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.test.runTest
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.data.*
-import space.kscience.dataforge.io.*
+import space.kscience.dataforge.io.Envelope
+import space.kscience.dataforge.io.IOFormat
+import space.kscience.dataforge.io.io
+import space.kscience.dataforge.io.readEnvelopeFile
 import space.kscience.dataforge.io.yaml.YamlPlugin
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.misc.DFExperimental
@ -36,11 +42,11 @@ class FileDataTest {
    object StringIOFormat : IOFormat<String> {
        override val type: KType get() = typeOf<String>()

-        override fun writeObject(output: Output, obj: String) {
-            output.writeUtf8String(obj)
+        override fun writeTo(sink: Sink, obj: String) {
+            sink.writeString(obj)
        }

-        override fun readObject(input: Input): String = input.readUtf8String()
+        override fun readFrom(source: Source): String = source.readString()
    }

    @Test
@ -59,9 +65,9 @@ class FileDataTest {

    @Test
    @DFExperimental
-    fun testZipWriteRead() = with(Global.io) {
+    fun testZipWriteRead() = runTest {
+        with(Global.io) {
            val zip = Files.createTempFile("df_data_node", ".zip")
-        runBlocking {
            dataNode.writeZip(zip, StringIOFormat)
            println(zip.toUri().toString())
            val reconstructed = readDataDirectory(zip) { _, _ -> StringIOFormat }
--- a/gradle.properties
+++ b/gradle.properties
@ -6,4 +6,5 @@ kotlin.mpp.stability.nowarn=true
 kotlin.incremental.js.ir=true
 kotlin.native.ignoreDisabledTargets=true

-toolsVersion=0.14.9-kotlin-1.8.20
+toolsVersion=0.15.1-kotlin-1.9.21
+#kotlin.experimental.tryK2=true
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@ -1,7 +1,6 @@
 rootProject.name = "dataforge-core"

 enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
-//enableFeaturePreview("VERSION_CATALOGS")

 pluginManagement {

@ -15,6 +14,7 @@ pluginManagement {
    }

    plugins {
+        id("org.gradle.toolchains.foojay-resolver-convention") version "0.7.0"
        id("space.kscience.gradle.project") version toolsVersion
        id("space.kscience.gradle.mpp") version toolsVersion
        id("space.kscience.gradle.jvm") version toolsVersion
Author	SHA1	Message	Date
Alexander Nozik	c754dc3471	Merge pull request '0.7.0' (!79) from dev into master Reviewed-on: #79	2023-11-26 10:08:10 +03:00
Alexander Nozik	8f7d754301	Update gradle	2023-11-26 10:07:39 +03:00
Alexander Nozik	c923c3e7d3	Merge remote-tracking branch 'spc/master' into dev	2023-11-26 10:06:39 +03:00
Alexander Nozik	99b2d941c8	Update Readme and CHANGELOG	2023-11-26 10:05:19 +03:00
Alexander Nozik	191af77f57	0.7.0	2023-11-26 09:59:28 +03:00
Alexander Nozik	79759c5256	Replace `MetaProvider::getMeta` by `get`	2023-11-22 17:06:23 +03:00
Alexander Nozik	2eb965e563	Type -> DfId Add descriptor to MetaConverter	2023-11-18 22:48:10 +03:00
Alexander Nozik	1b29e377ca	Type -> DfId Add descriptor to MetaConverter	2023-11-18 22:43:53 +03:00
Alexander Nozik	2634a19285	deprecate String.parseValue	2023-11-12 14:26:28 +03:00
Alexander Nozik	261c415d3d	Meta converters return non-nullables	2023-10-29 21:39:40 +03:00
Alexander Nozik	e52d509c2b	Add Name.last extension	2023-10-29 10:48:33 +03:00
Alexander Nozik	706521a6b6	Suppress manual cast warnings in task builders	2023-10-24 10:52:41 +03:00
Alexander Nozik	94000689da	Merge branch 'beta/kotlin-1.9.20' into dev # Conflicts: # CHANGELOG.md # build.gradle.kts # dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt # dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt # gradle.properties	2023-10-24 09:04:37 +03:00
Alexander Nozik	851fdda311	Fix memory leak in sealed builder. Fine-grained Meta builders.	2023-10-08 18:21:04 +03:00
Alexander Nozik	cbbcd18df3	Refactor io.	2023-10-08 18:20:23 +03:00
Alexander Nozik	dc2bf5da83	Merge branch 'kotlinx-io' into dev # Conflicts: # dataforge-io/build.gradle.kts # dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt # gradle.properties	2023-10-08 16:55:47 +03:00
Alexander Nozik	f732b85cc5	kotlin 1.9.20	2023-09-16 15:20:31 +03:00
Alexander Nozik	259b882e63	kotlin 1.9.20	2023-09-13 12:19:20 +03:00
Alexander Nozik	526f230300	Merge branch 'kotlinx-io' into beta/kotlin-1.9.20 # Conflicts: # dataforge-io/build.gradle.kts # dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt # gradle.properties	2023-09-13 08:28:43 +03:00
Alexander Nozik	a136db16ff	Refactoring to kotlinx-io complete	2023-07-15 10:49:42 +03:00
Alexander Nozik	a699c36f8e	[WIP] Refactoring to kotlinx-io	2023-07-11 23:03:52 +03:00
Alexander Nozik	2aba1b48dc	[WIP] Refactoring to kotlinx-io	2023-07-10 10:06:39 +03:00