diff --git a/dataforge-context/src/commonMain/kotlin/hep/dataforge/context/Context.kt b/dataforge-context/src/commonMain/kotlin/hep/dataforge/context/Context.kt
index d1ff801d..bf5c8924 100644
--- a/dataforge-context/src/commonMain/kotlin/hep/dataforge/context/Context.kt
+++ b/dataforge-context/src/commonMain/kotlin/hep/dataforge/context/Context.kt
@@ -69,7 +69,7 @@ open class Context(final override val name: String, val parent: Context? = Globa
     override fun listTop(target: String): Sequence<Name> {
         return when (target) {
             Plugin.PLUGIN_TARGET -> plugins.asSequence().map { it.name.toName() }
-            Value.TYPE -> properties.asValueSequence().map { it.first }
+            Value.TYPE -> properties.values().map { it.first }
             else -> emptySequence()
         }
     }
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
index 6a714076..e62c3621 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
@@ -91,19 +91,19 @@ fun Meta.getAll(name: Name): Map<String, MetaItem<out Meta>> {
 fun Meta.getAll(name: String): Map<String, MetaItem<out Meta>> = getAll(name.toName())
 
 /**
- * Transform meta to sequence of [Name]-[Value] pairs
+ * Get a sequence of [Name]-[Value] pairs
  */
-fun Meta.asValueSequence(): Sequence<Pair<Name, Value>> {
+fun Meta.values(): Sequence<Pair<Name, Value>> {
     return items.asSequence().flatMap { entry ->
         val item = entry.value
         when (item) {
             is ValueItem -> sequenceOf(entry.key.asName() to item.value)
-            is NodeItem -> item.node.asValueSequence().map { pair -> (entry.key.asName() + pair.first) to pair.second }
+            is NodeItem -> item.node.values().map { pair -> (entry.key.asName() + pair.first) to pair.second }
         }
     }
 }
 
-operator fun Meta.iterator(): Iterator<Pair<Name, Value>> = asValueSequence().iterator()
+operator fun Meta.iterator(): Iterator<Pair<Name, Value>> = values().iterator()
 
 /**
  * A meta node that ensures that all of its descendants has at least the same type
@@ -112,6 +112,27 @@ interface MetaNode<M : MetaNode<M>> : Meta {
     override val items: Map<NameToken, MetaItem<M>>
 }
 
+/**
+ * Get all items matching given name.
+ */
+fun <M : MetaNode<M>> MetaNode<M>.getAll(name: Name): Map<String, MetaItem<M>> {
+    val root: MetaNode<M>? = when (name.length) {
+        0 -> error("Can't use empty name for that")
+        1 -> this
+        else -> (this[name.cutLast()] as? NodeItem<M>)?.node
+    }
+
+    val (body, index) = name.last()!!
+    val regex = index.toRegex()
+
+    return root?.items
+        ?.filter { it.key.body == body && (index.isEmpty() || regex.matches(it.key.index)) }
+        ?.mapKeys { it.key.index }
+        ?: emptyMap()
+}
+
+fun <M : MetaNode<M>> M.getAll(name: String): Map<String, MetaItem<M>> = getAll(name.toName())
+
 operator fun <M : MetaNode<M>> MetaNode<M>.get(name: Name): MetaItem<M>? {
     return name.first()?.let { token ->
         val tail = name.cutFirst()
@@ -122,7 +143,7 @@ operator fun <M : MetaNode<M>> MetaNode<M>.get(name: Name): MetaItem<M>? {
     }
 }
 
-operator fun <M : MetaNode<M>> MetaNode<M>.get(key: String): MetaItem<M>? = get(key.toName())
+operator fun <M : MetaNode<M>> MetaNode<M>?.get(key: String): MetaItem<M>? = this?.let { get(key.toName()) }
 
 /**
  * Equals and hash code implementation for meta node
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
index 9600d9b1..f3b4f3ba 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
@@ -1,10 +1,6 @@
 package hep.dataforge.meta
 
-import hep.dataforge.names.Name
-import hep.dataforge.names.NameToken
-import hep.dataforge.names.plus
-import hep.dataforge.names.toName
-import hep.dataforge.names.asName
+import hep.dataforge.names.*
 import hep.dataforge.values.Value
 
 internal data class MetaListener(
@@ -152,12 +148,12 @@ fun <M : MutableMetaNode<M>> M.update(meta: Meta) {
 fun <M : MutableMeta<M>> M.setIndexed(
     name: Name,
     items: Iterable<MetaItem<M>>,
-    queryFactory: (Int) -> String = { it.toString() }
+    indexFactory: MetaItem<M>.(index: Int) -> String = { it.toString() }
 ) {
     val tokens = name.tokens.toMutableList()
     val last = tokens.last()
     items.forEachIndexed { index, meta ->
-        val indexedToken = NameToken(last.body, last.index + queryFactory(index))
+        val indexedToken = NameToken(last.body, last.index + meta.indexFactory(index))
         tokens[tokens.lastIndex] = indexedToken
         set(Name(tokens), meta)
     }
@@ -166,10 +162,24 @@ fun <M : MutableMeta<M>> M.setIndexed(
 fun <M : MutableMetaNode<M>> M.setIndexed(
     name: Name,
     metas: Iterable<Meta>,
-    queryFactory: (Int) -> String = { it.toString() }
+    indexFactory: MetaItem<M>.(index: Int) -> String = { it.toString() }
 ) {
-    setIndexed(name, metas.map { MetaItem.NodeItem(wrap(name, it)) }, queryFactory)
+    setIndexed(name, metas.map { MetaItem.NodeItem(wrap(name, it)) }, indexFactory)
 }
 
 operator fun <M : MutableMetaNode<M>> M.set(name: Name, metas: Iterable<Meta>) = setIndexed(name, metas)
 operator fun <M : MutableMetaNode<M>> M.set(name: String, metas: Iterable<Meta>) = setIndexed(name.toName(), metas)
+
+/**
+ * Append the node with a same-name-sibling, automatically generating numerical index
+ */
+fun <M : MutableMetaNode<M>> M.append(name: Name, value: Any?) {
+    require(!name.isEmpty()) { "Name could not be empty for append operation" }
+    val newIndex = name.last()!!.index
+    if (newIndex.isNotEmpty()) {
+        set(name, value)
+    } else {
+        val index = (getAll(name).keys.mapNotNull { it.toIntOrNull() }.max() ?: -1) + 1
+        set(name.withIndex(index.toString()), value)
+    }
+}
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt
index 759eb425..4ce3c1e5 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt
@@ -105,4 +105,15 @@ fun NameToken.asName() = Name(listOf(this))
 
 val EmptyName = Name(emptyList())
 
-fun Name.isEmpty(): Boolean = this.length == 0
\ No newline at end of file
+fun Name.isEmpty(): Boolean = this.length == 0
+
+/**
+ * Set or replace last token index
+ */
+fun Name.withIndex(index: String): Name {
+    val tokens = ArrayList(tokens)
+    val last = NameToken(tokens.last().body, index)
+    tokens.removeAt(tokens.size - 1)
+    tokens.add(last)
+    return Name(tokens)
+}
\ No newline at end of file
diff --git a/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaBuilderTest.kt b/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaBuilderTest.kt
index 0e399bad..849a34fc 100644
--- a/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaBuilderTest.kt
+++ b/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaBuilderTest.kt
@@ -30,7 +30,7 @@ class MetaBuilderTest {
                 "b.a[$it]" to it
             }
         }.seal()
-        assertEquals(10, meta.asValueSequence().count())
+        assertEquals(10, meta.values().count())
 
         val nodes = meta.getAll("b.a")
 
diff --git a/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/StyledTest.kt b/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/StyledTest.kt
index 14e6027b..5a4699f9 100644
--- a/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/StyledTest.kt
+++ b/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/StyledTest.kt
@@ -14,7 +14,7 @@ class StyledTest{
                 }
             }
         }.seal().withStyle()
-        assertEquals(10, meta.asValueSequence().count())
+        assertEquals(10, meta.values().count())
 
         val bNode = meta["b"].node
 
@@ -22,8 +22,8 @@ class StyledTest{
 
         val allNodes = meta.getAll("b.a")
 
-        assertEquals(3, aNodes?.get("3")?.node["d"]?.int)
-        assertEquals(3, allNodes["3"]?.node["d"]?.int)
+        assertEquals(3, aNodes?.get("3").node["d"].int)
+        assertEquals(3, allNodes["3"].node["d"].int)
     }
 
 }
\ No newline at end of file
diff --git a/dataforge-meta/src/jsMain/kotlin/hep/dataforge/meta/DynamicMeta.kt b/dataforge-meta/src/jsMain/kotlin/hep/dataforge/meta/DynamicMeta.kt
index 02432dfb..4719831b 100644
--- a/dataforge-meta/src/jsMain/kotlin/hep/dataforge/meta/DynamicMeta.kt
+++ b/dataforge-meta/src/jsMain/kotlin/hep/dataforge/meta/DynamicMeta.kt
@@ -32,7 +32,8 @@ fun Meta.toDynamic(): dynamic {
 class DynamicMeta(val obj: dynamic) : Meta {
     private fun keys() = js("Object.keys(this.obj)") as Array<String>
 
-    private fun isArray(obj: dynamic): Boolean = js("Array.isArray(obj)") as Boolean
+    private fun isArray(@Suppress("UNUSED_PARAMETER") obj: dynamic): Boolean =
+        js("Array.isArray(obj)") as Boolean
 
     private fun asItem(obj: dynamic): MetaItem<DynamicMeta>? {
         if (obj == null) return MetaItem.ValueItem(Null)