diff --git a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/_data.kt b/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/_data.kt
deleted file mode 100644
index 00c9e656..00000000
--- a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/_data.kt
+++ /dev/null
@@ -1,8 +0,0 @@
-package hep.dataforge.data
-
-import kotlinx.coroutines.runBlocking
-
-/**
- * Block the thread and get data content
- */
-fun <T : Any> Data<T>.get(): T = runBlocking { await() }
\ No newline at end of file
diff --git a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/checkType.kt b/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/dataJVM.kt
similarity index 70%
rename from dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/checkType.kt
rename to dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/dataJVM.kt
index 0b4c602f..f87c4155 100644
--- a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/checkType.kt
+++ b/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/dataJVM.kt
@@ -1,8 +1,14 @@
 package hep.dataforge.data
 
+import kotlinx.coroutines.runBlocking
 import kotlin.reflect.KClass
 import kotlin.reflect.full.isSuperclassOf
 
+/**
+ * Block the thread and get data content
+ */
+fun <T : Any> Data<T>.get(): T = runBlocking { await() }
+
 /**
  * Check that node is compatible with given type meaning that each element could be cast to the type
  */
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/BinaryMetaFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/BinaryMetaFormat.kt
index aa4be898..daf08756 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/BinaryMetaFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/BinaryMetaFormat.kt
@@ -80,7 +80,7 @@ object BinaryMetaFormat : MetaFormat {
                     writeValue(item.value)
                 }
                 is MetaItem.NodeItem -> {
-                    writeObject(item.node)
+                    writeThis(item.node)
                 }
             }
         }
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/Envelope.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/Envelope.kt
index 08fe44e5..bfbe40bf 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/Envelope.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/Envelope.kt
@@ -1,6 +1,8 @@
 package hep.dataforge.io
 
+import hep.dataforge.context.Named
 import hep.dataforge.io.EnvelopeFormat.Companion.ENVELOPE_FORMAT_TYPE
+import hep.dataforge.io.IOPlugin.Companion.defaultMetaFormats
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.get
 import hep.dataforge.meta.string
@@ -49,15 +51,23 @@ val Envelope.dataType: String? get() = meta[Envelope.ENVELOPE_DATA_TYPE_KEY].str
  */
 val Envelope.description: String? get() = meta[Envelope.ENVELOPE_DESCRIPTION_KEY].string
 
+/**
+ * A partially read envelope with meta, but without data
+ */
+@ExperimentalUnsignedTypes
 data class PartialEnvelope(val meta: Meta, val dataOffset: UInt, val dataSize: ULong?)
 
 @Type(ENVELOPE_FORMAT_TYPE)
-interface EnvelopeFormat : IOFormat<Envelope>{
-    fun readPartial(input: Input): PartialEnvelope
+interface EnvelopeFormat : IOFormat<Envelope>, Named {
+    fun Input.readPartial(formats: Collection<MetaFormat> = defaultMetaFormats): PartialEnvelope
 
-    fun Output.writeEnvelope(envelope: Envelope, format: MetaFormat)
+    fun Input.readEnvelope(formats: Collection<MetaFormat> = defaultMetaFormats): Envelope
 
-    override fun Output.writeObject(obj: Envelope) = writeEnvelope(obj, JsonMetaFormat)
+    override fun Input.readThis(): Envelope  = readEnvelope()
+
+    fun Output.writeEnvelope(envelope: Envelope, format: MetaFormat = JsonMetaFormat)
+
+    override fun Output.writeThis(obj: Envelope) = writeEnvelope(obj)
 
     companion object {
         const val ENVELOPE_FORMAT_TYPE = "envelopeFormat"
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt
index 9055b249..9cc9a584 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOFormat.kt
@@ -6,9 +6,9 @@ import kotlinx.io.core.*
  * And interface for serialization facilities
  */
 interface IOFormat<T : Any> {
-    fun Output.writeObject(obj: T)
-    fun Input.readObject(): T
+    fun Output.writeThis(obj: T)
+    fun Input.readThis(): T
 }
 
-fun <T : Any> IOFormat<T>.writePacket(obj: T): ByteReadPacket = buildPacket { writeObject(obj) }
-fun <T : Any> IOFormat<T>.writeBytes(obj: T): ByteArray = buildPacket { writeObject(obj) }.readBytes()
\ No newline at end of file
+fun <T : Any> IOFormat<T>.writePacket(obj: T): ByteReadPacket = buildPacket { writeThis(obj) }
+fun <T : Any> IOFormat<T>.writeBytes(obj: T): ByteArray = buildPacket { writeThis(obj) }.readBytes()
\ No newline at end of file
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOPlugin.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOPlugin.kt
index 6416e5c4..b65e4982 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOPlugin.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/IOPlugin.kt
@@ -6,7 +6,6 @@ import hep.dataforge.context.PluginTag
 import hep.dataforge.context.content
 import hep.dataforge.meta.Meta
 import hep.dataforge.names.Name
-import hep.dataforge.names.asName
 import kotlin.reflect.KClass
 
 class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
@@ -21,16 +20,15 @@ class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
 
     override fun provideTop(target: String): Map<Name, Any> {
         return when (target) {
-            MetaFormat.META_FORMAT_TYPE -> internalMetaFormats
-            EnvelopeFormat.ENVELOPE_FORMAT_TYPE -> mapOf(
-                TaggedEnvelopeFormat.VERSION.asName() to TaggedEnvelopeFormat(metaFormats)
-            )
+            MetaFormat.META_FORMAT_TYPE -> defaultMetaFormats.toMap()
+            EnvelopeFormat.ENVELOPE_FORMAT_TYPE -> defaultEnvelopeFormats.toMap()
             else -> super.provideTop(target)
         }
     }
 
     companion object : PluginFactory<IOPlugin> {
-        private val internalMetaFormats = listOf(JsonMetaFormat, BinaryMetaFormat).toMap()
+        val defaultMetaFormats: List<MetaFormat> = listOf(JsonMetaFormat, BinaryMetaFormat)
+        val defaultEnvelopeFormats = listOf(TaggedEnvelopeFormat)
 
         override val tag: PluginTag = PluginTag("io", group = PluginTag.DATAFORGE_GROUP)
         override val type: KClass<out IOPlugin> = IOPlugin::class
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/JsonMetaFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/JsonMetaFormat.kt
index 5dabf499..ab31f78c 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/JsonMetaFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/JsonMetaFormat.kt
@@ -56,15 +56,16 @@ fun Value.toJson(descriptor: ValueDescriptor? = null): JsonElement {
 
 //Use theese methods to customize JSON key mapping
 private fun NameToken.toJsonKey(descriptor: ItemDescriptor?) = toString()
+
 private fun NodeDescriptor?.getDescriptor(key: String) = this?.items?.get(key)
 
 fun Meta.toJson(descriptor: NodeDescriptor? = null): JsonObject {
 
     //TODO search for same name siblings and arrange them into arrays
-    val map = this.items.entries.associate {(name,item)->
+    val map = this.items.entries.associate { (name, item) ->
         val itemDescriptor = descriptor?.items?.get(name.body)
         val key = name.toJsonKey(itemDescriptor)
-        val value =          when (item) {
+        val value = when (item) {
             is MetaItem.ValueItem -> {
                 item.value.toJson(itemDescriptor as? ValueDescriptor)
             }
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/MetaFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/MetaFormat.kt
index f658ca32..b0ecafa4 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/MetaFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/MetaFormat.kt
@@ -15,11 +15,11 @@ interface MetaFormat : IOFormat<Meta>, Named {
     override val name: String
     val key: Short
 
-    override fun Output.writeObject(obj: Meta) {
+    override fun Output.writeThis(obj: Meta) {
         writeMeta(obj, null)
     }
 
-    override fun Input.readObject(): Meta = readMeta(null)
+    override fun Input.readThis(): Meta = readMeta(null)
 
     fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor? = null)
     fun Input.readMeta(descriptor: NodeDescriptor? = null): Meta
@@ -30,20 +30,20 @@ interface MetaFormat : IOFormat<Meta>, Named {
 }
 
 fun Meta.toString(format: MetaFormat = JsonMetaFormat): String = buildPacket {
-    format.run { writeObject(this@toString) }
+    format.run { writeThis(this@toString) }
 }.readText()
 
 fun Meta.toBytes(format: MetaFormat = JsonMetaFormat): ByteReadPacket = buildPacket {
-    format.run { writeObject(this@toBytes) }
+    format.run { writeThis(this@toBytes) }
 }
 
 
 fun MetaFormat.parse(str: String): Meta {
-    return ByteReadPacket(str.toByteArray()).readObject()
+    return ByteReadPacket(str.toByteArray()).readThis()
 }
 
 fun MetaFormat.fromBytes(packet: ByteReadPacket): Meta {
-    return packet.readObject()
+    return packet.readThis()
 }
 
 
diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt
index dbbe9c58..291f539d 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaggedEnvelopeFormat.kt
@@ -2,21 +2,75 @@ package hep.dataforge.io
 
 import kotlinx.io.core.*
 
-class TaggedEnvelopeFormat(val metaFormats: Collection<MetaFormat>) : EnvelopeFormat {
+
+@ExperimentalUnsignedTypes
+object TaggedEnvelopeFormat : EnvelopeFormat {
+    const val VERSION = "DF03"
+    private const val START_SEQUENCE = "#~"
+    private const val END_SEQUENCE = "~#\r\n"
+    private const val TAG_SIZE = 26u
+
+    override val name: String get() = VERSION
+
+    private fun Tag.toBytes(): ByteReadPacket = buildPacket(24) {
+        writeText(START_SEQUENCE)
+        writeText(VERSION)
+        writeShort(metaFormatKey)
+        writeUInt(metaSize)
+        writeULong(dataSize)
+        writeText(END_SEQUENCE)
+    }
+
+    private fun Input.readTag(): Tag {
+        val start = readTextExactBytes(2)
+        if (start != START_SEQUENCE) error("The input is not an envelope")
+        val version = readTextExactBytes(4)
+        if (version != VERSION) error("Wrong version of DataForge: expected $VERSION but found $version")
+        val metaFormatKey = readShort()
+        val metaLength = readUInt()
+        val dataLength = readULong()
+        return Tag(metaFormatKey, metaLength, dataLength)
+    }
 
     override fun Output.writeEnvelope(envelope: Envelope, format: MetaFormat) {
-        write(this, envelope, format)
+        val metaBytes = format.writeBytes(envelope.meta)
+        val tag = Tag(format.key, metaBytes.size.toUInt(), envelope.data?.size ?: 0.toULong())
+        writePacket(tag.toBytes())
+        writeFully(metaBytes)
+        envelope.data?.read { copyTo(this@writeEnvelope) }
     }
 
     /**
      * Read an envelope from input into memory
      *
      * @param input an input to read from
-     * @param metaFormats a collection of meta formats to resolve
+     * @param formats a collection of meta formats to resolve
      */
-    override fun Input.readObject(): Envelope = read(this, metaFormats)
+    override fun Input.readEnvelope(formats: Collection<MetaFormat>): Envelope {
+        val tag = readTag()
 
-    override fun readPartial(input: Input): PartialEnvelope = Companion.readPartial(input, metaFormats)
+        val metaFormat = formats.find { it.key == tag.metaFormatKey }
+            ?: error("Meta format with key ${tag.metaFormatKey} not found")
+
+        val metaPacket = ByteReadPacket(readBytes(tag.metaSize.toInt()))
+        val meta = metaFormat.run { metaPacket.readThis() }
+
+        val dataBytes = readBytes(tag.dataSize.toInt())
+
+        return SimpleEnvelope(meta, ArrayBinary(dataBytes))
+    }
+
+    override fun Input.readPartial(formats: Collection<MetaFormat>): PartialEnvelope {
+        val tag = readTag()
+
+        val metaFormat = formats.find { it.key == tag.metaFormatKey }
+            ?: error("Meta format with key ${tag.metaFormatKey} not found")
+
+        val metaPacket = ByteReadPacket(readBytes(tag.metaSize.toInt()))
+        val meta = metaFormat.run { metaPacket.readThis() }
+
+        return PartialEnvelope(meta, TAG_SIZE + tag.metaSize, tag.dataSize)
+    }
 
     private data class Tag(
         val metaFormatKey: Short,
@@ -24,64 +78,4 @@ class TaggedEnvelopeFormat(val metaFormats: Collection<MetaFormat>) : EnvelopeFo
         val dataSize: ULong
     )
 
-    companion object {
-        const val VERSION = "DF03"
-        private const val START_SEQUENCE = "#~"
-        private const val END_SEQUENCE = "~#\r\n"
-        private const val TAG_SIZE = 26u
-
-        private fun Tag.toBytes(): ByteReadPacket = buildPacket(24) {
-            writeText(START_SEQUENCE)
-            writeText(VERSION)
-            writeShort(metaFormatKey)
-            writeUInt(metaSize)
-            writeULong(dataSize)
-            writeText(END_SEQUENCE)
-        }
-
-        private fun Input.readTag(): Tag {
-            val start = readTextExactBytes(2)
-            if (start != START_SEQUENCE) error("The input is not an envelope")
-            val version = readTextExactBytes(4)
-            if (version != VERSION) error("Wrong version of DataForge: expected $VERSION but found $version")
-            val metaFormatKey = readShort()
-            val metaLength = readUInt()
-            val dataLength = readULong()
-            return Tag(metaFormatKey, metaLength, dataLength)
-        }
-
-        fun read(input: Input, metaFormats: Collection<MetaFormat>): Envelope {
-            val tag = input.readTag()
-
-            val metaFormat = metaFormats.find { it.key == tag.metaFormatKey }
-                ?: error("Meta format with key ${tag.metaFormatKey} not found")
-
-            val metaPacket = ByteReadPacket(input.readBytes(tag.metaSize.toInt()))
-            val meta = metaFormat.run { metaPacket.readObject() }
-
-            val dataBytes = input.readBytes(tag.dataSize.toInt())
-
-            return SimpleEnvelope(meta, ArrayBinary(dataBytes))
-        }
-
-        fun readPartial(input: Input, metaFormats: Collection<MetaFormat>): PartialEnvelope {
-            val tag = input.readTag()
-
-            val metaFormat = metaFormats.find { it.key == tag.metaFormatKey }
-                ?: error("Meta format with key ${tag.metaFormatKey} not found")
-
-            val metaPacket = ByteReadPacket(input.readBytes(tag.metaSize.toInt()))
-            val meta = metaFormat.run { metaPacket.readObject() }
-
-            return PartialEnvelope(meta, TAG_SIZE + tag.metaSize, tag.dataSize)
-        }
-
-        fun write(out: Output, envelope: Envelope, metaFormat: MetaFormat) {
-            val metaBytes = metaFormat.writeBytes(envelope.meta)
-            val tag = Tag(metaFormat.key, metaBytes.size.toUInt(), envelope.data?.size ?: 0.toULong())
-            out.writePacket(tag.toBytes())
-            out.writeFully(metaBytes)
-            envelope.data?.read { copyTo(out) }
-        }
-    }
 }
\ No newline at end of file
diff --git a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileBinary.kt b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileBinary.kt
index e68d002d..038281d4 100644
--- a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileBinary.kt
+++ b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileBinary.kt
@@ -7,6 +7,7 @@ import java.nio.file.Files
 import java.nio.file.Path
 import java.nio.file.StandardOpenOption
 
+@ExperimentalUnsignedTypes
 class FileBinary(val path: Path, private val offset: UInt = 0u, size: ULong? = null) : RandomAccessBinary {
 
     override val size: ULong = size ?: (Files.size(path).toULong() - offset).toULong()
diff --git a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileEnvelope.kt b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileEnvelope.kt
index de926db8..fdc4acc0 100644
--- a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileEnvelope.kt
+++ b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/FileEnvelope.kt
@@ -2,6 +2,7 @@ package hep.dataforge.io
 
 import hep.dataforge.meta.Meta
 import kotlinx.io.nio.asInput
+import kotlinx.io.nio.asOutput
 import java.nio.file.Files
 import java.nio.file.Path
 import java.nio.file.StandardOpenOption
@@ -13,7 +14,7 @@ class FileEnvelope internal constructor(val path: Path, val format: EnvelopeForm
 
     init {
         val input = Files.newByteChannel(path, StandardOpenOption.READ).asInput()
-        partialEnvelope = format.readPartial(input)
+        partialEnvelope = format.run { input.readPartial() }
     }
 
     override val meta: Meta get() = partialEnvelope.meta
@@ -21,4 +22,21 @@ class FileEnvelope internal constructor(val path: Path, val format: EnvelopeForm
     override val data: Binary? = FileBinary(path, partialEnvelope.dataOffset, partialEnvelope.dataSize)
 }
 
-fun Path.readEnvelope(format: EnvelopeFormat) = FileEnvelope(this,format)
\ No newline at end of file
+fun Path.readEnvelope(format: EnvelopeFormat) = FileEnvelope(this, format)
+
+fun Path.writeEnvelope(
+    envelope: Envelope,
+    format: EnvelopeFormat = TaggedEnvelopeFormat,
+    metaFormat: MetaFormat = JsonMetaFormat
+) {
+    val output = Files.newByteChannel(
+        this,
+        StandardOpenOption.WRITE,
+        StandardOpenOption.CREATE,
+        StandardOpenOption.TRUNCATE_EXISTING
+    ).asOutput()
+
+    with(format) {
+        output.writeEnvelope(envelope, metaFormat)
+    }
+}
\ No newline at end of file
diff --git a/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/fileData.kt b/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/fileData.kt
index 25350006..1367998d 100644
--- a/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/fileData.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/fileData.kt
@@ -62,7 +62,7 @@ suspend fun <T : Any> Context.readData(
                 format.run {
                     Files.newByteChannel(path, StandardOpenOption.READ)
                         .asInput()
-                        .readObject()
+                        .readThis()
                 }
             }
         }