diff --git a/build.gradle.kts b/build.gradle.kts
index aebfc4f..b0b93d5 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -5,8 +5,8 @@ plugins {
     id("space.kscience.gradle.project")
 }
 
-val dataforgeVersion: String by extra("0.7.1")
-val visionforgeVersion by extra("0.3.1")
+val dataforgeVersion: String by extra("0.8.0")
+val visionforgeVersion by extra("0.4.0")
 val ktorVersion: String by extra(space.kscience.gradle.KScienceVersions.ktorVersion)
 val rsocketVersion by extra("0.15.4")
 val xodusVersion by extra("2.0.1")
diff --git a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceConstructor.kt b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceConstructor.kt
index 5dbbe13..5c11f27 100644
--- a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceConstructor.kt
+++ b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceConstructor.kt
@@ -5,7 +5,7 @@ import space.kscience.controls.api.PropertyDescriptor
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import kotlin.properties.PropertyDelegateProvider
diff --git a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceGroup.kt b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceGroup.kt
index 26b5896..6cdb784 100644
--- a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceGroup.kt
+++ b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceGroup.kt
@@ -12,11 +12,7 @@ import space.kscience.controls.manager.install
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.context.request
-import space.kscience.dataforge.meta.Laminate
-import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MutableMeta
-import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.*
 import kotlin.collections.set
diff --git a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceState.kt b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceState.kt
index 672b0a6..1828edd 100644
--- a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceState.kt
+++ b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/DeviceState.kt
@@ -10,7 +10,7 @@ import space.kscience.controls.spec.DevicePropertySpec
 import space.kscience.controls.spec.MutableDevicePropertySpec
 import space.kscience.controls.spec.name
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 import kotlin.time.Duration
 
 /**
@@ -25,9 +25,9 @@ public interface DeviceState<T> {
     public companion object
 }
 
-public val <T> DeviceState<T>.metaFlow: Flow<Meta> get() = valueFlow.map(converter::objectToMeta)
+public val <T> DeviceState<T>.metaFlow: Flow<Meta> get() = valueFlow.map(converter::convert)
 
-public val <T> DeviceState<T>.valueAsMeta: Meta get() = converter.objectToMeta(value)
+public val <T> DeviceState<T>.valueAsMeta: Meta get() = converter.convert(value)
 
 
 /**
@@ -38,9 +38,9 @@ public interface MutableDeviceState<T> : DeviceState<T> {
 }
 
 public var <T : Any> MutableDeviceState<T>.valueAsMeta: Meta
-    get() = converter.objectToMeta(value)
+    get() = converter.convert(value)
     set(arg) {
-        value = converter.metaToObject(arg)
+        value = converter.read(arg)
     }
 
 /**
@@ -98,7 +98,7 @@ private open class BoundDeviceState<T>(
     override val valueFlow: StateFlow<T> = device.messageFlow.filterIsInstance<PropertyChangedMessage>().filter {
         it.property == propertyName
     }.mapNotNull {
-        converter.metaToObject(it.value)
+        converter.read(it.value)
     }.stateIn(device.context, SharingStarted.Eagerly, initialValue)
 
     override val value: T get() = valueFlow.value
@@ -111,7 +111,7 @@ public suspend fun <T> Device.propertyAsState(
     propertyName: String,
     metaConverter: MetaConverter<T>,
 ): DeviceState<T> {
-    val initialValue = metaConverter.metaToObject(readProperty(propertyName)) ?: error("Conversion of property failed")
+    val initialValue = metaConverter.readOrNull(readProperty(propertyName)) ?: error("Conversion of property failed")
     return BoundDeviceState(metaConverter, this, propertyName, initialValue)
 }
 
@@ -140,7 +140,7 @@ private class MutableBoundDeviceState<T>(
         get() = valueFlow.value
         set(newValue) {
             device.launch {
-                device.writeProperty(propertyName, converter.objectToMeta(newValue))
+                device.writeProperty(propertyName, converter.convert(newValue))
             }
         }
 }
@@ -155,7 +155,7 @@ public suspend fun <T> Device.mutablePropertyAsState(
     propertyName: String,
     metaConverter: MetaConverter<T>,
 ): MutableDeviceState<T> {
-    val initialValue = metaConverter.metaToObject(readProperty(propertyName)) ?: error("Conversion of property failed")
+    val initialValue = metaConverter.readOrNull(readProperty(propertyName)) ?: error("Conversion of property failed")
     return mutablePropertyAsState(propertyName, metaConverter, initialValue)
 }
 
diff --git a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Drive.kt b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Drive.kt
index c2391c8..8301622 100644
--- a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Drive.kt
+++ b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Drive.kt
@@ -9,9 +9,9 @@ import space.kscience.controls.manager.clock
 import space.kscience.controls.spec.*
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
+import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.meta.double
 import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.transformations.MetaConverter
 import kotlin.math.pow
 import kotlin.time.Duration.Companion.milliseconds
 import kotlin.time.DurationUnit
diff --git a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Regulator.kt b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Regulator.kt
index 7495d33..cbe6967 100644
--- a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Regulator.kt
+++ b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/Regulator.kt
@@ -2,7 +2,7 @@ package space.kscience.controls.constructor
 
 import space.kscience.controls.api.Device
 import space.kscience.controls.spec.*
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 
 
 /**
diff --git a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/customState.kt b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/customState.kt
index 6e95ccd..100f755 100644
--- a/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/customState.kt
+++ b/controls-constructor/src/commonMain/kotlin/space/kscience/controls/constructor/customState.kt
@@ -2,7 +2,7 @@ package space.kscience.controls.constructor
 
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 
 
 /**
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/api/Device.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/api/Device.kt
index 89040c0..3226422 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/api/Device.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/api/Device.kt
@@ -139,7 +139,7 @@ public interface CachingDevice : Device {
 /**
  * Get the logical state of property or suspend to read the physical value.
  */
-public suspend fun Device.requestProperty(propertyName: String): Meta = if (this is CachingDevice) {
+public suspend fun Device.getOrReadProperty(propertyName: String): Meta = if (this is CachingDevice) {
     getProperty(propertyName) ?: readProperty(propertyName)
 } else {
     readProperty(propertyName)
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/manager/respondMessage.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/manager/respondMessage.kt
index 3a0ac7b..fc6fb5d 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/manager/respondMessage.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/manager/respondMessage.kt
@@ -16,7 +16,7 @@ public suspend fun Device.respondMessage(deviceTarget: Name, request: DeviceMess
         is PropertyGetMessage -> {
             PropertyChangedMessage(
                 property = request.property,
-                value = requestProperty(request.property),
+                value = getOrReadProperty(request.property),
                 sourceDevice = deviceTarget,
                 targetDevice = request.sourceDevice
             )
@@ -26,7 +26,7 @@ public suspend fun Device.respondMessage(deviceTarget: Name, request: DeviceMess
             writeProperty(request.property, request.value)
             PropertyChangedMessage(
                 property = request.property,
-                value = requestProperty(request.property),
+                value = getOrReadProperty(request.property),
                 sourceDevice = deviceTarget,
                 targetDevice = request.sourceDevice
             )
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/PropertyHistory.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/PropertyHistory.kt
index 5b58321..96bd8d5 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/PropertyHistory.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/PropertyHistory.kt
@@ -9,7 +9,7 @@ import space.kscience.controls.api.DeviceMessage
 import space.kscience.controls.api.PropertyChangedMessage
 import space.kscience.controls.spec.DevicePropertySpec
 import space.kscience.controls.spec.name
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 
 /**
  * An interface for device property history.
@@ -42,7 +42,7 @@ public class CollectedPropertyHistory<T>(
     private val store: SharedFlow<ValueWithTime<T>> = eventFlow
         .filterIsInstance<PropertyChangedMessage>()
         .filter { it.property == propertyName }
-        .map { ValueWithTime(converter.metaToObject(it.value), it.time) }
+        .map { ValueWithTime(converter.read(it.value), it.time) }
         .shareIn(scope, started = SharingStarted.Eagerly, replay = maxSize)
 
     override fun flowHistory(from: Instant, until: Instant): Flow<ValueWithTime<T>> =
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/ValueWithTime.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/ValueWithTime.kt
index 0bf07d3..f25c4f4 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/ValueWithTime.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/misc/ValueWithTime.kt
@@ -5,10 +5,8 @@ import kotlinx.io.Sink
 import kotlinx.io.Source
 import space.kscience.dataforge.io.IOFormat
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.transformations.MetaConverter
-import kotlin.reflect.KType
-import kotlin.reflect.typeOf
 
 /**
  * A value coupled to a time it was obtained at
@@ -36,8 +34,6 @@ public data class ValueWithTime<T>(val value: T, val time: Instant) {
 }
 
 private class ValueWithTimeIOFormat<T>(val valueFormat: IOFormat<T>) : IOFormat<ValueWithTime<T>> {
-    override val type: KType get() = typeOf<ValueWithTime<T>>()
-
 
     override fun readFrom(source: Source): ValueWithTime<T> {
         val timestamp = InstantIOFormat.readFrom(source)
@@ -56,18 +52,18 @@ private class ValueWithTimeMetaConverter<T>(
     val valueConverter: MetaConverter<T>,
 ) : MetaConverter<ValueWithTime<T>> {
 
-    override val type: KType = typeOf<ValueWithTime<T>>()
 
-    override fun metaToObjectOrNull(
-        meta: Meta,
-    ): ValueWithTime<T>? = valueConverter.metaToObject(meta[ValueWithTime.META_VALUE_KEY] ?: Meta.EMPTY)?.let {
-        ValueWithTime(it, meta[ValueWithTime.META_TIME_KEY]?.instant ?: Instant.DISTANT_PAST)
+    override fun readOrNull(
+        source: Meta,
+    ): ValueWithTime<T>? = valueConverter.read(source[ValueWithTime.META_VALUE_KEY] ?: Meta.EMPTY)?.let {
+        ValueWithTime(it, source[ValueWithTime.META_TIME_KEY]?.instant ?: Instant.DISTANT_PAST)
     }
 
-    override fun objectToMeta(obj: ValueWithTime<T>): Meta = Meta {
+    override fun convert(obj: ValueWithTime<T>): Meta = Meta {
         ValueWithTime.META_TIME_KEY put obj.time.toMeta()
-        ValueWithTime.META_VALUE_KEY put valueConverter.objectToMeta(obj.value)
+        ValueWithTime.META_VALUE_KEY put valueConverter.convert(obj.value)
     }
 }
 
+
 public fun <T : Any> MetaConverter<T>.withTime(): MetaConverter<ValueWithTime<T>> = ValueWithTimeMetaConverter(this)
\ No newline at end of file
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceBase.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceBase.kt
index 846815c..dcb48b4 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceBase.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceBase.kt
@@ -21,7 +21,7 @@ import kotlin.coroutines.CoroutineContext
  */
 @OptIn(InternalDeviceAPI::class)
 private suspend fun <D : Device, T> MutableDevicePropertySpec<D, T>.writeMeta(device: D, item: Meta) {
-    write(device, converter.metaToObject(item) ?: error("Meta $item could not be read with $converter"))
+    write(device, converter.readOrNull(item) ?: error("Meta $item could not be read with $converter"))
 }
 
 /**
@@ -29,16 +29,16 @@ private suspend fun <D : Device, T> MutableDevicePropertySpec<D, T>.writeMeta(de
  */
 @OptIn(InternalDeviceAPI::class)
 private suspend fun <D : Device, T> DevicePropertySpec<D, T>.readMeta(device: D): Meta? =
-    read(device)?.let(converter::objectToMeta)
+    read(device)?.let(converter::convert)
 
 
 private suspend fun <D : Device, I, O> DeviceActionSpec<D, I, O>.executeWithMeta(
     device: D,
     item: Meta,
 ): Meta? {
-    val arg: I = inputConverter.metaToObject(item) ?: error("Failed to convert $item with $inputConverter")
+    val arg: I = inputConverter.readOrNull(item) ?: error("Failed to convert $item with $inputConverter")
     val res = execute(device, arg)
-    return res?.let { outputConverter.objectToMeta(res) }
+    return res?.let { outputConverter.convert(res) }
 }
 
 
@@ -120,7 +120,7 @@ public abstract class DeviceBase<D : Device>(
      * Notify the device that a property with [spec] value is changed
      */
     protected suspend fun <T> propertyChanged(spec: DevicePropertySpec<D, T>, value: T) {
-        propertyChanged(spec.name, spec.converter.objectToMeta(value))
+        propertyChanged(spec.name, spec.converter.convert(value))
     }
 
     /**
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceMetaPropertySpec.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceMetaPropertySpec.kt
index 809d940..c5fe8b5 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceMetaPropertySpec.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceMetaPropertySpec.kt
@@ -3,9 +3,9 @@ package space.kscience.controls.spec
 import space.kscience.controls.api.Device
 import space.kscience.controls.api.PropertyDescriptor
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 
-internal object DeviceMetaPropertySpec: DevicePropertySpec<Device,Meta> {
+internal object DeviceMetaPropertySpec : DevicePropertySpec<Device, Meta> {
     override val descriptor: PropertyDescriptor = PropertyDescriptor("@meta")
 
     override val converter: MetaConverter<Meta> = MetaConverter.meta
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DevicePropertySpec.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DevicePropertySpec.kt
index 8e0d6de..edf9f93 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DevicePropertySpec.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DevicePropertySpec.kt
@@ -5,7 +5,7 @@ import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
 import space.kscience.controls.api.*
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 
 
 /**
@@ -72,23 +72,23 @@ public interface DeviceActionSpec<in D, I, O> {
 public val DeviceActionSpec<*, *, *>.name: String get() = descriptor.name
 
 public suspend fun <T, D : Device> D.read(propertySpec: DevicePropertySpec<D, T>): T =
-    propertySpec.converter.metaToObject(readProperty(propertySpec.name)) ?: error("Property read result is not valid")
+    propertySpec.converter.readOrNull(readProperty(propertySpec.name)) ?: error("Property read result is not valid")
 
 /**
  * Read typed value and update/push event if needed.
  * Return null if property read is not successful or property is undefined.
  */
 public suspend fun <T, D : DeviceBase<D>> D.readOrNull(propertySpec: DevicePropertySpec<D, T>): T? =
-    readPropertyOrNull(propertySpec.name)?.let(propertySpec.converter::metaToObject)
+    readPropertyOrNull(propertySpec.name)?.let(propertySpec.converter::readOrNull)
 
-public suspend fun <T, D : Device> D.request(propertySpec: DevicePropertySpec<D, T>): T =
-    propertySpec.converter.metaToObject(requestProperty(propertySpec.name))
+public suspend fun <T, D : Device> D.getOrRead(propertySpec: DevicePropertySpec<D, T>): T =
+    propertySpec.converter.read(getOrReadProperty(propertySpec.name))
 
 /**
  * Write typed property state and invalidate logical state
  */
 public suspend fun <T, D : Device> D.write(propertySpec: MutableDevicePropertySpec<D, T>, value: T) {
-    writeProperty(propertySpec.name, propertySpec.converter.objectToMeta(value))
+    writeProperty(propertySpec.name, propertySpec.converter.convert(value))
 }
 
 /**
@@ -104,7 +104,7 @@ public fun <T, D : Device> D.writeAsync(propertySpec: MutableDevicePropertySpec<
 public fun <D : Device, T> D.propertyFlow(spec: DevicePropertySpec<D, T>): Flow<T> = messageFlow
     .filterIsInstance<PropertyChangedMessage>()
     .filter { it.property == spec.name }
-    .mapNotNull { spec.converter.metaToObject(it.value) }
+    .mapNotNull { spec.converter.read(it.value) }
 
 /**
  * A type safe property change listener. Uses the device [CoroutineScope].
@@ -117,7 +117,7 @@ public fun <D : Device, T> D.onPropertyChange(
     .filterIsInstance<PropertyChangedMessage>()
     .filter { it.property == spec.name }
     .onEach { change ->
-        val newValue = spec.converter.metaToObject(change.value)
+        val newValue = spec.converter.read(change.value)
         if (newValue != null) {
             change.callback(newValue)
         }
@@ -136,7 +136,7 @@ public fun <D : Device, T> D.useProperty(
         .filterIsInstance<PropertyChangedMessage>()
         .filter { it.property == spec.name }
         .collect { change ->
-            val newValue = spec.converter.metaToObject(change.value)
+            val newValue = spec.converter.readOrNull(change.value)
             if (newValue != null) {
                 callback(newValue)
             }
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceSpec.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceSpec.kt
index 4091921..2f90cb8 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceSpec.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/DeviceSpec.kt
@@ -5,20 +5,16 @@ import space.kscience.controls.api.ActionDescriptor
 import space.kscience.controls.api.Device
 import space.kscience.controls.api.PropertyDescriptor
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 import kotlin.properties.PropertyDelegateProvider
 import kotlin.properties.ReadOnlyProperty
 import kotlin.reflect.KProperty
-import kotlin.reflect.KType
-import kotlin.reflect.typeOf
 
 public object UnitMetaConverter : MetaConverter<Unit> {
 
-    override val type: KType = typeOf<Unit>()
+    override fun readOrNull(source: Meta): Unit = Unit
 
-    override fun metaToObjectOrNull(meta: Meta): Unit = Unit
-
-    override fun objectToMeta(obj: Unit): Meta = Meta.EMPTY
+    override fun convert(obj: Unit): Meta = Meta.EMPTY
 }
 
 public val MetaConverter.Companion.unit: MetaConverter<Unit> get() = UnitMetaConverter
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/misc.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/misc.kt
index ee14237..1fc4649 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/misc.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/misc.kt
@@ -1,9 +1,6 @@
 package space.kscience.controls.spec
 
 import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.transformations.MetaConverter
-import kotlin.reflect.KType
-import kotlin.reflect.typeOf
 import kotlin.time.Duration
 import kotlin.time.DurationUnit
 import kotlin.time.toDuration
@@ -12,16 +9,14 @@ public fun Double.asMeta(): Meta = Meta(asValue())
 
 //TODO to be moved to DF
 public object DurationConverter : MetaConverter<Duration> {
-    override val type: KType = typeOf<Duration>()
-
-    override fun metaToObjectOrNull(meta: Meta): Duration = meta.value?.double?.toDuration(DurationUnit.SECONDS)
+    override fun readOrNull(source: Meta): Duration = source.value?.double?.toDuration(DurationUnit.SECONDS)
         ?: run {
-            val unit: DurationUnit = meta["unit"].enum<DurationUnit>() ?: DurationUnit.SECONDS
-            val value = meta[Meta.VALUE_KEY].double ?: error("No value present for Duration")
+            val unit: DurationUnit = source["unit"].enum<DurationUnit>() ?: DurationUnit.SECONDS
+            val value = source[Meta.VALUE_KEY].double ?: error("No value present for Duration")
             return@run value.toDuration(unit)
         }
 
-    override fun objectToMeta(obj: Duration): Meta = obj.toDouble(DurationUnit.SECONDS).asMeta()
+    override fun convert(obj: Duration): Meta = obj.toDouble(DurationUnit.SECONDS).asMeta()
 }
 
 public val MetaConverter.Companion.duration: MetaConverter<Duration> get() = DurationConverter
\ No newline at end of file
diff --git a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/propertySpecDelegates.kt b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/propertySpecDelegates.kt
index 231891c..8bd22b6 100644
--- a/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/propertySpecDelegates.kt
+++ b/controls-core/src/commonMain/kotlin/space/kscience/controls/spec/propertySpecDelegates.kt
@@ -4,8 +4,8 @@ import space.kscience.controls.api.Device
 import space.kscience.controls.api.PropertyDescriptor
 import space.kscience.controls.api.metaDescriptor
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.meta.ValueType
-import space.kscience.dataforge.meta.transformations.MetaConverter
 import kotlin.properties.PropertyDelegateProvider
 import kotlin.properties.ReadOnlyProperty
 import kotlin.reflect.KMutableProperty1
@@ -53,8 +53,8 @@ public fun <T, D : DeviceBase<D>> DeviceSpec<D>.logicalProperty(
         converter,
         descriptorBuilder,
         name,
-        read = { propertyName -> getProperty(propertyName)?.let(converter::metaToObject) },
-        write = { propertyName, value -> writeProperty(propertyName, converter.objectToMeta(value)) }
+        read = { propertyName -> getProperty(propertyName)?.let(converter::readOrNull) },
+        write = { propertyName, value -> writeProperty(propertyName, converter.convert(value)) }
     )
 
 
diff --git a/controls-jupyter/src/jsMain/kotlin/commonJupyter.kt b/controls-jupyter/src/jsMain/kotlin/commonJupyter.kt
index 41711d7..388e1ab 100644
--- a/controls-jupyter/src/jsMain/kotlin/commonJupyter.kt
+++ b/controls-jupyter/src/jsMain/kotlin/commonJupyter.kt
@@ -1,7 +1,7 @@
+import space.kscience.visionforge.html.runVisionClient
 import space.kscience.visionforge.jupyter.VFNotebookClient
 import space.kscience.visionforge.markup.MarkupPlugin
 import space.kscience.visionforge.plotly.PlotlyPlugin
-import space.kscience.visionforge.runVisionClient
 
 public fun main(): Unit = runVisionClient {
 //    plugin(DeviceManager)
diff --git a/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/DeviceClient.kt b/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/DeviceClient.kt
index 31dbd89..51836b9 100644
--- a/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/DeviceClient.kt
+++ b/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/DeviceClient.kt
@@ -144,7 +144,7 @@ public fun <T> MagixEndpoint.controlsPropertyFlow(
         .filter { message ->
             message.sourceDevice == deviceName && message.property == propertySpec.name
         }.map {
-            propertySpec.converter.metaToObject(it.value)
+            propertySpec.converter.read(it.value)
         }
 }
 
@@ -157,7 +157,7 @@ public suspend fun <T> MagixEndpoint.sendControlsPropertyChange(
 ) {
     val message = PropertySetMessage(
         property = propertySpec.name,
-        value = propertySpec.converter.objectToMeta(value),
+        value = propertySpec.converter.convert(value),
         targetDevice = deviceName
     )
     send(DeviceManager.magixFormat, message, source = sourceEndpointName, target = targetEndpointName)
@@ -177,6 +177,6 @@ public fun <T> MagixEndpoint.controlsPropertyMessageFlow(
         .filter { message ->
             message.sourceDevice == deviceName && message.property == propertySpec.name
         }.map {
-            it to propertySpec.converter.metaToObject(it.value)
+            it to propertySpec.converter.read(it.value)
         }
 }
\ No newline at end of file
diff --git a/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/clientPropertyAccess.kt b/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/clientPropertyAccess.kt
index 22b0413..20c59e8 100644
--- a/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/clientPropertyAccess.kt
+++ b/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/clientPropertyAccess.kt
@@ -5,7 +5,7 @@ import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
 import space.kscience.controls.api.PropertyChangedMessage
-import space.kscience.controls.api.requestProperty
+import space.kscience.controls.api.getOrReadProperty
 import space.kscience.controls.spec.DeviceActionSpec
 import space.kscience.controls.spec.DevicePropertySpec
 import space.kscience.controls.spec.MutableDevicePropertySpec
@@ -17,14 +17,14 @@ import space.kscience.dataforge.meta.Meta
  * An accessor that allows DeviceClient to connect to any property without type checks
  */
 public suspend fun <T> DeviceClient.read(propertySpec: DevicePropertySpec<*, T>): T =
-    propertySpec.converter.metaToObject(readProperty(propertySpec.name)) ?: error("Property read result is not valid")
+    propertySpec.converter.readOrNull(readProperty(propertySpec.name)) ?: error("Property read result is not valid")
 
 
 public suspend fun <T> DeviceClient.request(propertySpec: DevicePropertySpec<*, T>): T =
-    propertySpec.converter.metaToObject(requestProperty(propertySpec.name))
+    propertySpec.converter.read(getOrReadProperty(propertySpec.name))
 
 public suspend fun <T> DeviceClient.write(propertySpec: MutableDevicePropertySpec<*, T>, value: T) {
-    writeProperty(propertySpec.name, propertySpec.converter.objectToMeta(value))
+    writeProperty(propertySpec.name, propertySpec.converter.convert(value))
 }
 
 public fun <T> DeviceClient.writeAsync(propertySpec: MutableDevicePropertySpec<*, T>, value: T): Job = launch {
@@ -34,7 +34,7 @@ public fun <T> DeviceClient.writeAsync(propertySpec: MutableDevicePropertySpec<*
 public fun <T> DeviceClient.propertyFlow(spec: DevicePropertySpec<*, T>): Flow<T> = messageFlow
     .filterIsInstance<PropertyChangedMessage>()
     .filter { it.property == spec.name }
-    .mapNotNull { spec.converter.metaToObject(it.value) }
+    .mapNotNull { spec.converter.readOrNull(it.value) }
 
 public fun <T> DeviceClient.onPropertyChange(
     spec: DevicePropertySpec<*, T>,
@@ -44,7 +44,7 @@ public fun <T> DeviceClient.onPropertyChange(
     .filterIsInstance<PropertyChangedMessage>()
     .filter { it.property == spec.name }
     .onEach { change ->
-        val newValue = spec.converter.metaToObject(change.value)
+        val newValue = spec.converter.readOrNull(change.value)
         if (newValue != null) {
             change.callback(newValue)
         }
@@ -60,7 +60,7 @@ public fun <T> DeviceClient.useProperty(
         .filterIsInstance<PropertyChangedMessage>()
         .filter { it.property == spec.name }
         .collect { change ->
-            val newValue = spec.converter.metaToObject(change.value)
+            val newValue = spec.converter.readOrNull(change.value)
             if (newValue != null) {
                 callback(newValue)
             }
@@ -68,12 +68,12 @@ public fun <T> DeviceClient.useProperty(
 }
 
 public suspend fun <I, O> DeviceClient.execute(actionSpec: DeviceActionSpec<*, I, O>, input: I): O {
-    val inputMeta = actionSpec.inputConverter.objectToMeta(input)
+    val inputMeta = actionSpec.inputConverter.convert(input)
     val res = execute(actionSpec.name, inputMeta)
-    return actionSpec.outputConverter.metaToObject(res ?: Meta.EMPTY)
+    return actionSpec.outputConverter.read(res ?: Meta.EMPTY)
 }
 
 public suspend fun <O> DeviceClient.execute(actionSpec: DeviceActionSpec<*, Unit, O>): O {
     val res = execute(actionSpec.name, Meta.EMPTY)
-    return actionSpec.outputConverter.metaToObject(res ?: Meta.EMPTY)
+    return actionSpec.outputConverter.read(res ?: Meta.EMPTY)
 }
\ No newline at end of file
diff --git a/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/tangoMagix.kt b/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/tangoMagix.kt
index 9c30f8c..d0bdda4 100644
--- a/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/tangoMagix.kt
+++ b/controls-magix/src/commonMain/kotlin/space/kscience/controls/client/tangoMagix.kt
@@ -6,7 +6,7 @@ import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import kotlinx.serialization.Serializable
 import space.kscience.controls.api.get
-import space.kscience.controls.api.requestProperty
+import space.kscience.controls.api.getOrReadProperty
 import space.kscience.controls.manager.DeviceManager
 import space.kscience.dataforge.context.error
 import space.kscience.dataforge.context.logger
@@ -91,7 +91,7 @@ public fun DeviceManager.launchTangoMagix(
                 val device = get(payload.device)
                 when (payload.action) {
                     TangoAction.read -> {
-                        val value = device.requestProperty(payload.name)
+                        val value = device.getOrReadProperty(payload.name)
                         respond(request, payload) { requestPayload ->
                             requestPayload.copy(
                                 value = value,
@@ -104,7 +104,7 @@ public fun DeviceManager.launchTangoMagix(
                             device.writeProperty(payload.name, value)
                         }
                         //wait for value to be written and return final state
-                        val value = device.requestProperty(payload.name)
+                        val value = device.getOrReadProperty(payload.name)
                         respond(request, payload) { requestPayload ->
                             requestPayload.copy(
                                 value = value,
diff --git a/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDevice.kt b/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDevice.kt
index 51e6032..08a84b0 100644
--- a/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDevice.kt
+++ b/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDevice.kt
@@ -9,8 +9,8 @@ import org.eclipse.milo.opcua.stack.core.types.builtin.*
 import org.eclipse.milo.opcua.stack.core.types.enumerated.TimestampsToReturn
 import space.kscience.controls.api.Device
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.meta.MetaSerializer
-import space.kscience.dataforge.meta.transformations.MetaConverter
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
@@ -43,7 +43,7 @@ public suspend inline fun <reified T: Any> OpcUaDevice.readOpcWithTime(
         else -> error("Incompatible OPC property value $content")
     }
 
-    val res: T = converter.metaToObject(meta)
+    val res: T = converter.read(meta)
     return res to time
 }
 
@@ -69,7 +69,7 @@ public suspend inline fun <reified T> OpcUaDevice.readOpc(
         else -> error("Incompatible OPC property value $content")
     }
 
-    return converter.metaToObject(meta) ?: error("Meta $meta could not be converted to ${T::class}")
+    return converter.readOrNull(meta) ?: error("Meta $meta could not be converted to ${T::class}")
 }
 
 public suspend inline fun <reified T> OpcUaDevice.writeOpc(
@@ -77,7 +77,7 @@ public suspend inline fun <reified T> OpcUaDevice.writeOpc(
     converter: MetaConverter<T>,
     value: T
 ): StatusCode {
-    val meta = converter.objectToMeta(value)
+    val meta = converter.convert(value)
     return client.writeValue(nodeId, DataValue(Variant(meta))).await()
 }
 
diff --git a/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDeviceBySpec.kt b/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDeviceBySpec.kt
index 188760e..7debc0e 100644
--- a/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDeviceBySpec.kt
+++ b/controls-opcua/src/main/kotlin/space/kscience/controls/opcua/client/OpcUaDeviceBySpec.kt
@@ -31,7 +31,7 @@ public class MiloConfiguration : Scheme() {
 
     public var endpointUrl: String by string { error("Endpoint url is not defined") }
 
-    public var username: MiloUsername? by specOrNull(MiloUsername)
+    public var username: MiloUsername? by schemeOrNull(MiloUsername)
 
     public var securityPolicy: SecurityPolicy by enum(SecurityPolicy.None)
 
diff --git a/controls-opcua/src/test/kotlin/space/kscience/controls/opcua/client/OpcUaClientTest.kt b/controls-opcua/src/test/kotlin/space/kscience/controls/opcua/client/OpcUaClientTest.kt
index 33aa8fb..b4d63ad 100644
--- a/controls-opcua/src/test/kotlin/space/kscience/controls/opcua/client/OpcUaClientTest.kt
+++ b/controls-opcua/src/test/kotlin/space/kscience/controls/opcua/client/OpcUaClientTest.kt
@@ -7,7 +7,7 @@ import org.junit.jupiter.api.Test
 import space.kscience.controls.spec.DeviceSpec
 import space.kscience.controls.spec.doubleProperty
 import space.kscience.controls.spec.read
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 import kotlin.test.Ignore
 
 class OpcUaClientTest {
diff --git a/controls-storage/controls-xodus/src/main/kotlin/space/kscience/controls/xodus/XodusDeviceMessageStorage.kt b/controls-storage/controls-xodus/src/main/kotlin/space/kscience/controls/xodus/XodusDeviceMessageStorage.kt
index 35c9b89..559d2a0 100644
--- a/controls-storage/controls-xodus/src/main/kotlin/space/kscience/controls/xodus/XodusDeviceMessageStorage.kt
+++ b/controls-storage/controls-xodus/src/main/kotlin/space/kscience/controls/xodus/XodusDeviceMessageStorage.kt
@@ -6,8 +6,6 @@ import jetbrains.exodus.entitystore.PersistentEntityStores
 import jetbrains.exodus.entitystore.StoreTransaction
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.asFlow
-import kotlinx.coroutines.flow.filter
-import kotlinx.coroutines.flow.map
 import kotlinx.datetime.Instant
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
@@ -72,13 +70,13 @@ public class XodusDeviceMessageStorage(
             DEVICE_MESSAGE_ENTITY_TYPE,
             DeviceMessage::time.name,
             true
-        ).asFlow().map {
+        ).map {
             Json.decodeFromString(
                 DeviceMessage.serializer(),
                 it.getBlobString("json") ?: error("No json content found")
             )
         }
-    }
+    }.asFlow()
 
     override fun read(
         eventType: String,
@@ -90,7 +88,7 @@ public class XodusDeviceMessageStorage(
             DEVICE_MESSAGE_ENTITY_TYPE,
             "type",
             eventType
-        ).asFlow().filter {
+        ).filter {
             it.timeInRange(range) &&
                     it.propertyMatchesName(DeviceMessage::sourceDevice.name, sourceDevice) &&
                     it.propertyMatchesName(DeviceMessage::targetDevice.name, targetDevice)
@@ -100,7 +98,7 @@ public class XodusDeviceMessageStorage(
                 it.getBlobString("json") ?: error("No json content found")
             )
         }
-    }
+    }.asFlow()
 
     override fun close() {
         entityStore.close()
diff --git a/controls-storage/controls-xodus/src/test/kotlin/PropertyHistoryTest.kt b/controls-storage/controls-xodus/src/test/kotlin/PropertyHistoryTest.kt
index 1724079..e7017b1 100644
--- a/controls-storage/controls-xodus/src/test/kotlin/PropertyHistoryTest.kt
+++ b/controls-storage/controls-xodus/src/test/kotlin/PropertyHistoryTest.kt
@@ -1,5 +1,6 @@
 import jetbrains.exodus.entitystore.PersistentEntityStores
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
 import kotlinx.datetime.Instant
 import org.junit.jupiter.api.AfterAll
@@ -7,8 +8,8 @@ import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.BeforeAll
 import org.junit.jupiter.api.Test
 import space.kscience.controls.api.PropertyChangedMessage
+import space.kscience.controls.storage.read
 import space.kscience.controls.xodus.XodusDeviceMessageStorage
-import space.kscience.controls.xodus.query
 import space.kscience.controls.xodus.writeMessage
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.names.Name
@@ -67,7 +68,7 @@ internal class PropertyHistoryTest {
             XodusDeviceMessageStorage(entityStore).use { storage ->
                 assertEquals(
                     propertyChangedMessages[0],
-                    storage.query<PropertyChangedMessage>(
+                    storage.read<PropertyChangedMessage>(
                         sourceDevice = "virtual-car".asName()
                     ).first { it.property == "speed" }
                 )
diff --git a/controls-storage/src/commonMain/kotlin/space/kscience/controls/storage/propertyHistory.kt b/controls-storage/src/commonMain/kotlin/space/kscience/controls/storage/propertyHistory.kt
index 0ca30cc..b52ed2b 100644
--- a/controls-storage/src/commonMain/kotlin/space/kscience/controls/storage/propertyHistory.kt
+++ b/controls-storage/src/commonMain/kotlin/space/kscience/controls/storage/propertyHistory.kt
@@ -7,7 +7,7 @@ import kotlinx.datetime.Instant
 import space.kscience.controls.api.PropertyChangedMessage
 import space.kscience.controls.misc.PropertyHistory
 import space.kscience.controls.misc.ValueWithTime
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.MetaConverter
 
 public fun <T> DeviceMessageStorage.propertyHistory(
     propertyName: String,
@@ -16,5 +16,5 @@ public fun <T> DeviceMessageStorage.propertyHistory(
     override fun flowHistory(from: Instant, until: Instant): Flow<ValueWithTime<T>> =
         read<PropertyChangedMessage>(from..until)
             .filter { it.property == propertyName }
-            .map { ValueWithTime(converter.metaToObject(it.value), it.time) }
+            .map { ValueWithTime(converter.read(it.value), it.time) }
 }
\ No newline at end of file
diff --git a/controls-vision/src/commonMain/kotlin/plotExtensions.kt b/controls-vision/src/commonMain/kotlin/plotExtensions.kt
index fde716b..6e92165 100644
--- a/controls-vision/src/commonMain/kotlin/plotExtensions.kt
+++ b/controls-vision/src/commonMain/kotlin/plotExtensions.kt
@@ -149,7 +149,7 @@ private fun <T> Trace.updateFromState(
 public fun <T> Plot.plotDeviceState(
     context: Context,
     state: DeviceState<T>,
-    extractValue: T.() -> Value = { state.converter.objectToMeta(this).value ?: Null },
+    extractValue: T.() -> Value = { state.converter.convert(this).value ?: Null },
     maxAge: Duration = defaultMaxAge,
     maxPoints: Int = defaultMaxPoints,
     minPoints: Int = defaultMinPoints,
diff --git a/controls-vision/src/jsMain/kotlin/ControlsVisionPlugin.js.kt b/controls-vision/src/jsMain/kotlin/ControlsVisionPlugin.js.kt
index b34cc44..017989b 100644
--- a/controls-vision/src/jsMain/kotlin/ControlsVisionPlugin.js.kt
+++ b/controls-vision/src/jsMain/kotlin/ControlsVisionPlugin.js.kt
@@ -7,10 +7,9 @@ import space.kscience.dataforge.context.PluginFactory
 import space.kscience.dataforge.context.PluginTag
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.names.Name
-import space.kscience.visionforge.ElementVisionRenderer
 import space.kscience.visionforge.Vision
-import space.kscience.visionforge.VisionClient
 import space.kscience.visionforge.VisionPlugin
+import space.kscience.visionforge.html.ElementVisionRenderer
 
 public actual class ControlVisionPlugin : VisionPlugin(), ElementVisionRenderer {
     override val tag: PluginTag get() = Companion.tag
@@ -21,7 +20,7 @@ public actual class ControlVisionPlugin : VisionPlugin(), ElementVisionRenderer
         TODO("Not yet implemented")
     }
 
-    override fun render(element: Element, client: VisionClient, name: Name, vision: Vision, meta: Meta) {
+    override fun render(element: Element, name: Name, vision: Vision, meta: Meta) {
         TODO("Not yet implemented")
     }
 
diff --git a/controls-vision/src/jsMain/kotlin/client.kt b/controls-vision/src/jsMain/kotlin/client.kt
index a835f9a..78da2e8 100644
--- a/controls-vision/src/jsMain/kotlin/client.kt
+++ b/controls-vision/src/jsMain/kotlin/client.kt
@@ -1,8 +1,8 @@
 package space.kscience.controls.vision
 
+import space.kscience.visionforge.html.runVisionClient
 import space.kscience.visionforge.markup.MarkupPlugin
 import space.kscience.visionforge.plotly.PlotlyPlugin
-import space.kscience.visionforge.runVisionClient
 
 public fun main(): Unit = runVisionClient {
     plugin(PlotlyPlugin)
diff --git a/demo/all-things/build.gradle.kts b/demo/all-things/build.gradle.kts
index 6888d35..1496f67 100644
--- a/demo/all-things/build.gradle.kts
+++ b/demo/all-things/build.gradle.kts
@@ -24,7 +24,7 @@ dependencies {
 
     implementation("io.ktor:ktor-client-cio:$ktorVersion")
     implementation("no.tornado:tornadofx:1.7.20")
-    implementation("space.kscience:plotlykt-server:0.6.1")
+    implementation("space.kscience:plotlykt-server:0.7.1")
 //    implementation("com.github.Ricky12Awesome:json-schema-serialization:0.6.6")
     implementation(spclibs.logback.classic)
 }
diff --git a/demo/all-things/src/main/kotlin/space/kscience/controls/demo/DemoDevice.kt b/demo/all-things/src/main/kotlin/space/kscience/controls/demo/DemoDevice.kt
index 657d275..5cf1b28 100644
--- a/demo/all-things/src/main/kotlin/space/kscience/controls/demo/DemoDevice.kt
+++ b/demo/all-things/src/main/kotlin/space/kscience/controls/demo/DemoDevice.kt
@@ -7,9 +7,9 @@ import space.kscience.controls.spec.*
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.meta.ValueType
 import space.kscience.dataforge.meta.descriptors.value
-import space.kscience.dataforge.meta.transformations.MetaConverter
 import java.time.Instant
 import kotlin.math.cos
 import kotlin.math.sin
diff --git a/demo/car/src/main/kotlin/space/kscience/controls/demo/car/MagixVirtualCar.kt b/demo/car/src/main/kotlin/space/kscience/controls/demo/car/MagixVirtualCar.kt
index 2c5d65a..27ea243 100644
--- a/demo/car/src/main/kotlin/space/kscience/controls/demo/car/MagixVirtualCar.kt
+++ b/demo/car/src/main/kotlin/space/kscience/controls/demo/car/MagixVirtualCar.kt
@@ -22,7 +22,7 @@ class MagixVirtualCar(context: Context, meta: Meta) : VirtualCar(context, meta)
             (payload as? PropertyChangedMessage)?.let { message ->
                 if (message.sourceDevice == Name.parse("virtual-car")) {
                     when (message.property) {
-                        "acceleration" -> write(IVirtualCar.acceleration, Vector2D.metaToObject(message.value))
+                        "acceleration" -> write(IVirtualCar.acceleration, Vector2D.read(message.value))
                     }
                 }
             }
diff --git a/demo/car/src/main/kotlin/space/kscience/controls/demo/car/VirtualCar.kt b/demo/car/src/main/kotlin/space/kscience/controls/demo/car/VirtualCar.kt
index 05bb2f0..86564a5 100644
--- a/demo/car/src/main/kotlin/space/kscience/controls/demo/car/VirtualCar.kt
+++ b/demo/car/src/main/kotlin/space/kscience/controls/demo/car/VirtualCar.kt
@@ -11,34 +11,26 @@ import space.kscience.controls.spec.doRecurring
 import space.kscience.controls.spec.read
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
-import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MetaRepr
-import space.kscience.dataforge.meta.double
-import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.*
 import kotlin.math.pow
-import kotlin.reflect.KType
-import kotlin.reflect.typeOf
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.milliseconds
 import kotlin.time.ExperimentalTime
 
 data class Vector2D(var x: Double = 0.0, var y: Double = 0.0) : MetaRepr {
 
-    override fun toMeta(): Meta = objectToMeta(this)
+    override fun toMeta(): Meta = convert(this)
 
     operator fun div(arg: Double): Vector2D = Vector2D(x / arg, y / arg)
 
     companion object CoordinatesMetaConverter : MetaConverter<Vector2D> {
 
-        override val type: KType = typeOf<Vector2D>()
-
-        override fun metaToObjectOrNull(meta: Meta): Vector2D = Vector2D(
-            meta["x"].double ?: 0.0,
-            meta["y"].double ?: 0.0
+        override fun readOrNull(source: Meta): Vector2D = Vector2D(
+            source["x"].double ?: 0.0,
+            source["y"].double ?: 0.0
         )
 
-        override fun objectToMeta(obj: Vector2D): Meta = Meta {
+        override fun convert(obj: Vector2D): Meta = Meta {
             "x" put obj.x
             "y" put obj.y
         }
diff --git a/demo/mks-pdr900/src/main/kotlin/center/sciprog/devices/mks/MksPdr900Device.kt b/demo/mks-pdr900/src/main/kotlin/center/sciprog/devices/mks/MksPdr900Device.kt
index cb8030c..1d48553 100644
--- a/demo/mks-pdr900/src/main/kotlin/center/sciprog/devices/mks/MksPdr900Device.kt
+++ b/demo/mks-pdr900/src/main/kotlin/center/sciprog/devices/mks/MksPdr900Device.kt
@@ -10,9 +10,9 @@ import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.context.request
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaConverter
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.int
-import space.kscience.dataforge.meta.transformations.MetaConverter
 
 
 //TODO this device is not tested
@@ -94,7 +94,7 @@ class MksPdr900Device(context: Context, meta: Meta) : DeviceBySpec<MksPdr900Devi
         val channel by logicalProperty(MetaConverter.int)
 
         val value by doubleProperty(read = {
-            readChannelData(request(channel) ?: DEFAULT_CHANNEL)
+            readChannelData(getOrRead(channel))
         })
 
         val error by logicalProperty(MetaConverter.string)
diff --git a/demo/motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/PiMotionMasterDevice.kt b/demo/motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/PiMotionMasterDevice.kt
index dde2750..5d05993 100644
--- a/demo/motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/PiMotionMasterDevice.kt
+++ b/demo/motors/src/main/kotlin/ru/mipt/npm/devices/pimotionmaster/PiMotionMasterDevice.kt
@@ -16,11 +16,7 @@ import space.kscience.controls.api.PropertyDescriptor
 import space.kscience.controls.ports.*
 import space.kscience.controls.spec.*
 import space.kscience.dataforge.context.*
-import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.asValue
-import space.kscience.dataforge.meta.double
-import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.transformations.MetaConverter
+import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.names.NameToken
 import kotlin.collections.component1
 import kotlin.collections.component2