diff --git a/build.gradle b/build.gradle
index ae66ee48..96797a98 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,7 @@
 buildscript {
     ext.kotlin_version = '1.3.0-rc-57'
     ext.serialization_version = '0.8.0-rc13'
+    ext.kotlinx_io_version = '0.1.0-alpha-15-rc13'
     repositories {
         jcenter()
         maven {
@@ -34,7 +35,3 @@ allprojects {
         //maven { url 'https://jitpack.io' }
     }
 }
-
-subprojects {
-    apply plugin: 'kotlinx-serialization'
-}
diff --git a/dataforge-envelope/build.gradle b/dataforge-envelope/build.gradle
new file mode 100644
index 00000000..fd1ea5e8
--- /dev/null
+++ b/dataforge-envelope/build.gradle
@@ -0,0 +1,13 @@
+plugins{
+    id 'kotlin-platform-common'
+}
+
+dependencies {
+    compile project(":dataforge-meta")
+
+    compile "org.jetbrains.kotlinx:kotlinx-io:$kotlinx_io_version"
+    
+    compile "org.jetbrains.kotlin:kotlin-stdlib-common:$kotlin_version"
+    testCompile "org.jetbrains.kotlin:kotlin-test-annotations-common"
+    testCompile "org.jetbrains.kotlin:kotlin-test-common"
+}
\ No newline at end of file
diff --git a/dataforge-envelope/src/main/kotlin/hep/dataforge/envelopes/Envelope.kt b/dataforge-envelope/src/main/kotlin/hep/dataforge/envelopes/Envelope.kt
new file mode 100644
index 00000000..9368a452
--- /dev/null
+++ b/dataforge-envelope/src/main/kotlin/hep/dataforge/envelopes/Envelope.kt
@@ -0,0 +1,9 @@
+package hep.dataforge.envelopes
+
+import hep.dataforge.meta.Meta
+import kotlinx.io.core.IoBuffer
+
+interface Envelope{
+    val meta: Meta
+    val data: IoBuffer
+}
\ No newline at end of file
diff --git a/dataforge-meta-common/build.gradle b/dataforge-meta/build.gradle
similarity index 72%
rename from dataforge-meta-common/build.gradle
rename to dataforge-meta/build.gradle
index a396466f..e13aef58 100644
--- a/dataforge-meta-common/build.gradle
+++ b/dataforge-meta/build.gradle
@@ -4,7 +4,7 @@ plugins{
 
 dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib-common:$kotlin_version"
-    compile  "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serialization_version"
+    
     testCompile "org.jetbrains.kotlin:kotlin-test-annotations-common"
     testCompile "org.jetbrains.kotlin:kotlin-test-common"
 }
\ No newline at end of file
diff --git a/dataforge-meta/dataforge-meta-io/build.gradle b/dataforge-meta/dataforge-meta-io/build.gradle
new file mode 100644
index 00000000..e56fdc44
--- /dev/null
+++ b/dataforge-meta/dataforge-meta-io/build.gradle
@@ -0,0 +1,19 @@
+plugins{
+    id 'kotlin-platform-common'
+}
+
+dependencies {
+    compile project(":dataforge-meta")
+    
+    
+    compile "org.jetbrains.kotlin:kotlin-stdlib-common:$kotlin_version"
+    compile "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serialization_version"
+    compile "org.jetbrains.kotlinx:kotlinx-io:$kotlinx_io_version"
+    
+    testCompile "org.jetbrains.kotlin:kotlin-test-annotations-common"
+    testCompile "org.jetbrains.kotlin:kotlin-test-common"
+}
+
+allprojects {
+    apply plugin: 'kotlinx-serialization'
+}
\ No newline at end of file
diff --git a/dataforge-meta/dataforge-meta-io/src/main/kotlin/hep/dataforge/meta/io/MetaFormat.kt b/dataforge-meta/dataforge-meta-io/src/main/kotlin/hep/dataforge/meta/io/MetaFormat.kt
new file mode 100644
index 00000000..75cd9773
--- /dev/null
+++ b/dataforge-meta/dataforge-meta-io/src/main/kotlin/hep/dataforge/meta/io/MetaFormat.kt
@@ -0,0 +1,26 @@
+package hep.dataforge.meta.io
+
+import hep.dataforge.meta.Meta
+import kotlinx.io.core.Input
+import kotlinx.io.core.Output
+
+/**
+ * A format for meta serialization
+ */
+interface MetaFormat {
+    val name : String
+    val key : Short
+
+    suspend fun write(meta: Meta, out: Output)
+    suspend fun read(input: Input): Meta
+}
+
+/**
+ * Resolve format by its name. Null if not provided
+ */
+expect fun resolveFormat(name: String): MetaFormat?
+
+/**
+ * Resolve format by its binary key. Null if not provided
+ */
+expect fun resolveFormat(key: Short): MetaFormat?
\ No newline at end of file
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Serializers.kt b/dataforge-meta/dataforge-meta-io/src/main/kotlin/hep/dataforge/meta/io/Serializers.kt
similarity index 77%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Serializers.kt
rename to dataforge-meta/dataforge-meta-io/src/main/kotlin/hep/dataforge/meta/io/Serializers.kt
index 1fd0a316..2297673e 100644
--- a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Serializers.kt
+++ b/dataforge-meta/dataforge-meta-io/src/main/kotlin/hep/dataforge/meta/io/Serializers.kt
@@ -1,46 +1,47 @@
-package hep.dataforge.meta
+package hep.dataforge.meta.io
 
-import kotlinx.serialization.json.*
+import hep.dataforge.meta.*
+import kotlinx.serialization.Serializable
 
 
 /*Universal serialization*/
 
-//sealed class MetaItemProxy {
-//
-//    @Serializable
-//    class NumberValueProxy(val number: Number) : MetaItemProxy()
-//
-//    @Serializable
-//    class StringValueProxy(val string: String) : MetaItemProxy()
-//
-//    @Serializable
-//    class BooleanValueProxy(val boolean: Boolean) : MetaItemProxy()
-//
-//    @Serializable
-//    object NullValueProxy : MetaItemProxy()
-//
-//    @Serializable
-//    class MetaProxy(@Serializable val map: Map<String, MetaItemProxy>) : MetaItemProxy()
-//
-//    @Serializable
-//    class MetaListProxy(@Serializable val nodes: List<MetaProxy>) : MetaItemProxy()
-//}
-//
-//
-//fun Meta.toMap(): Map<String, MetaItemProxy> {
-//   return this.items.mapValues { (_, value) ->
-//        when (value) {
-//            is MetaItem.ValueItem -> when (value.value.type) {
-//                ValueType.NUMBER -> MetaItemProxy.NumberValueProxy(value.value.number)
-//                ValueType.STRING -> MetaItemProxy.StringValueProxy(value.value.string)
-//                ValueType.BOOLEAN -> MetaItemProxy.BooleanValueProxy(value.value.boolean)
-//                ValueType.NULL -> MetaItemProxy.NullValueProxy
-//            }
-//            is MetaItem.SingleNodeItem -> MetaItemProxy.MetaProxy(value.node.toMap())
-//            is MetaItem.MultiNodeItem -> MetaItemProxy.MetaListProxy(value.nodes.map { MetaItemProxy.MetaProxy(it.toMap()) })
-//        }
-//    }
-//}
+sealed class MetaItemProxy {
+
+    @Serializable
+    class NumberValueProxy(val number: Number) : MetaItemProxy()
+
+    @Serializable
+    class StringValueProxy(val string: String) : MetaItemProxy()
+
+    @Serializable
+    class BooleanValueProxy(val boolean: Boolean) : MetaItemProxy()
+
+    @Serializable
+    object NullValueProxy : MetaItemProxy()
+
+    @Serializable
+    class MetaProxy(@Serializable val map: Map<String, MetaItemProxy>) : MetaItemProxy()
+
+    @Serializable
+    class MetaListProxy(@Serializable val nodes: List<MetaProxy>) : MetaItemProxy()
+}
+
+
+fun Meta.toMap(): Map<String, MetaItemProxy> {
+   return this.items.mapValues { (_, value) ->
+        when (value) {
+            is MetaItem.ValueItem<*> -> when (value.value.type) {
+                ValueType.NUMBER -> MetaItemProxy.NumberValueProxy(value.value.number)
+                ValueType.STRING -> MetaItemProxy.StringValueProxy(value.value.string)
+                ValueType.BOOLEAN -> MetaItemProxy.BooleanValueProxy(value.value.boolean)
+                ValueType.NULL -> MetaItemProxy.NullValueProxy
+            }
+            is MetaItem.SingleNodeItem<*> -> MetaItemProxy.MetaProxy(value.node.toMap())
+            is MetaItem.MultiNodeItem<*> -> MetaItemProxy.MetaListProxy(value.nodes.map { MetaItemProxy.MetaProxy(it.toMap()) })
+        }
+    }
+}
 
 
 /*Direct JSON serialization*/
diff --git a/dataforge-meta-js/build.gradle b/dataforge-meta/dataforge-meta-js/build.gradle
similarity index 55%
rename from dataforge-meta-js/build.gradle
rename to dataforge-meta/dataforge-meta-js/build.gradle
index f884412d..af0d28ca 100644
--- a/dataforge-meta-js/build.gradle
+++ b/dataforge-meta/dataforge-meta-js/build.gradle
@@ -3,9 +3,8 @@ plugins{
 }
 
 dependencies {
-    expectedBy project(":dataforge-meta-common")
+    expectedBy project(":dataforge-meta")
 
     compile "org.jetbrains.kotlin:kotlin-stdlib-js:$kotlin_version"
-    compile  "org.jetbrains.kotlinx:kotlinx-serialization-runtime-js:$serialization_version"
     testCompile "org.jetbrains.kotlin:kotlin-test-js"
 }
diff --git a/dataforge-meta-jvm/build.gradle b/dataforge-meta/dataforge-meta-jvm/build.gradle
similarity index 60%
rename from dataforge-meta-jvm/build.gradle
rename to dataforge-meta/dataforge-meta-jvm/build.gradle
index f371911a..1f4379b0 100644
--- a/dataforge-meta-jvm/build.gradle
+++ b/dataforge-meta/dataforge-meta-jvm/build.gradle
@@ -3,11 +3,9 @@ plugins{
 }
 
 dependencies {
-    expectedBy project(":dataforge-meta-common")
+    expectedBy project(":dataforge-meta")
 
     compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
-    compile  "org.jetbrains.kotlinx:kotlinx-serialization-runtime:$serialization_version"
     testCompile "org.jetbrains.kotlin:kotlin-test"
     testCompile "org.jetbrains.kotlin:kotlin-test-junit"
 }
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Config.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/Config.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Config.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/Config.kt
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Delegates.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/Delegates.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Delegates.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/Delegates.kt
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Meta.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/Meta.kt
similarity index 98%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Meta.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/Meta.kt
index b84a84e7..2d5eb1f1 100644
--- a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/Meta.kt
@@ -96,11 +96,6 @@ abstract class MetaNode<M : MetaNode<M>> : Meta {
     override fun hashCode(): Int {
         return items.hashCode()
     }
-
-    override fun toString(): String {
-        return toJSON().toString()
-    }
-
 }
 
 /**
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/MetaBuilder.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/MetaBuilder.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/MetaBuilder.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/MetaBuilder.kt
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/MutableMetaNode.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/MutableMetaNode.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/MutableMetaNode.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/MutableMetaNode.kt
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Specification.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/Specification.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Specification.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/Specification.kt
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Styleable.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/Styleable.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Styleable.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/Styleable.kt
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Value.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/meta/Value.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/meta/Value.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/meta/Value.kt
diff --git a/dataforge-meta-common/src/main/kotlin/hep/dataforge/names/Name.kt b/dataforge-meta/src/main/kotlin/hep/dataforge/names/Name.kt
similarity index 100%
rename from dataforge-meta-common/src/main/kotlin/hep/dataforge/names/Name.kt
rename to dataforge-meta/src/main/kotlin/hep/dataforge/names/Name.kt
diff --git a/dataforge-meta-common/src/test/kotlin/hep/dataforge/meta/MetaBuilderTest.kt b/dataforge-meta/src/test/kotlin/hep/dataforge/meta/MetaBuilderTest.kt
similarity index 100%
rename from dataforge-meta-common/src/test/kotlin/hep/dataforge/meta/MetaBuilderTest.kt
rename to dataforge-meta/src/test/kotlin/hep/dataforge/meta/MetaBuilderTest.kt
diff --git a/dataforge-meta-common/src/test/kotlin/hep/dataforge/meta/MetaDelegateTest.kt b/dataforge-meta/src/test/kotlin/hep/dataforge/meta/MetaDelegateTest.kt
similarity index 100%
rename from dataforge-meta-common/src/test/kotlin/hep/dataforge/meta/MetaDelegateTest.kt
rename to dataforge-meta/src/test/kotlin/hep/dataforge/meta/MetaDelegateTest.kt
diff --git a/dataforge-meta-common/src/test/kotlin/hep/dataforge/meta/SerializationTest.kt b/dataforge-meta/src/test/kotlin/hep/dataforge/meta/SerializationTest.kt
similarity index 100%
rename from dataforge-meta-common/src/test/kotlin/hep/dataforge/meta/SerializationTest.kt
rename to dataforge-meta/src/test/kotlin/hep/dataforge/meta/SerializationTest.kt
diff --git a/dataforge-meta-common/src/test/kotlin/hep/dataforge/names/NameTest.kt b/dataforge-meta/src/test/kotlin/hep/dataforge/names/NameTest.kt
similarity index 100%
rename from dataforge-meta-common/src/test/kotlin/hep/dataforge/names/NameTest.kt
rename to dataforge-meta/src/test/kotlin/hep/dataforge/names/NameTest.kt
diff --git a/settings.gradle b/settings.gradle
index 655d929b..3cd11386 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -14,8 +14,12 @@ pluginManagement {
     }
 }
 
-rootProject.name = 'dataforge-meta'
+rootProject.name = 'dataforge-core'
 
-include ":dataforge-meta-common"
-include ":dataforge-meta-jvm"
-include ":dataforge-meta-js"
\ No newline at end of file
+include ":dataforge-meta"
+include ":dataforge-meta:dataforge-meta-jvm"
+include ":dataforge-meta:dataforge-meta-js"
+
+include ":dataforge-meta:dataforge-meta-io"
+
+include ":dataforge-envelope"
\ No newline at end of file