diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidGroup.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidGroup.kt
index 27f95c17..b78ec4a5 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidGroup.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidGroup.kt
@@ -7,10 +7,19 @@ import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.NameToken
 import space.kscience.visionforge.*
 
+/**
+ * A container with prototype support
+ */
 public interface PrototypeHolder {
+    /**
+     * Build or update prototype tree
+     */
     @VisionBuilder
     public fun prototypes(builder: VisionContainerBuilder<Solid>.() -> Unit)
 
+    /**
+     * Resolve a prototype from this container. Should never return a ref.
+     */
     public fun getPrototype(name: Name): Solid?
 }
 
@@ -24,7 +33,7 @@ public class SolidGroup : VisionGroupBase(), Solid, PrototypeHolder {
 
     override val children: Map<NameToken, Vision> get() = super.childrenInternal.filter { it.key != PROTOTYPES_TOKEN }
 
-    public var prototypes: MutableVisionGroup?
+    private var prototypes: MutableVisionGroup?
         get() = childrenInternal[PROTOTYPES_TOKEN] as? MutableVisionGroup
         set(value) {
             set(PROTOTYPES_TOKEN, value)
@@ -35,7 +44,7 @@ public class SolidGroup : VisionGroupBase(), Solid, PrototypeHolder {
 
     /**
      * Get a prototype redirecting the request to the parent if prototype is not found.
-     * If prototype is a ref, then it is unfolded until
+     * If prototype is a ref, then it is unfolded automatically.
      */
     override fun getPrototype(name: Name): Solid? =
         prototypes?.get(name)?.unref ?: (parent as? PrototypeHolder)?.getPrototype(name)
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt
index 401f8097..2b7a8358 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt
@@ -37,16 +37,20 @@ private fun SolidReference.getRefProperty(
     inherit: Boolean,
     includeStyles: Boolean,
     includeDefaults: Boolean,
-): MetaItem? = buildList {
-    add(getOwnProperty(name))
-    if (includeStyles) {
-        addAll(getStyleItems(name))
-    }
-    add(prototype.getProperty(name, inherit, includeStyles, includeDefaults))
-    if (inherit) {
-        add(parent?.getProperty(name, inherit))
-    }
-}.merge()
+): MetaItem? = if (!inherit && !includeStyles && !includeDefaults) {
+    getOwnProperty(name)
+} else {
+    buildList {
+        add(getOwnProperty(name))
+        if (includeStyles) {
+            addAll(getStyleItems(name))
+        }
+        add(prototype.getProperty(name, inherit, includeStyles, includeDefaults))
+        if (inherit) {
+            add(parent?.getProperty(name, inherit))
+        }
+    }.merge()
+}
 
 private fun childToken(childName: Name): NameToken =
     NameToken(SolidReferenceGroup.REFERENCE_CHILD_PROPERTY_PREFIX, childName.toString())
@@ -102,7 +106,8 @@ public class SolidReferenceGroup(
             if (childName.isEmpty()) owner.prototype else {
                 val proto = (owner.prototype as? VisionGroup)?.get(childName)
                     ?: error("Prototype with name $childName not found in SolidReferenceGroup ${owner.refName}")
-                proto.unref as? Solid ?: error("Prototype with name $childName is ${proto::class} but expected Solid")
+                proto.unref as? Solid
+                    ?: error("Prototype with name $childName is ${proto::class} but expected Solid")
             }
         }
 
@@ -125,11 +130,7 @@ public class SolidReferenceGroup(
             inherit: Boolean,
             includeStyles: Boolean,
             includeDefaults: Boolean,
-        ): MetaItem? = if (!inherit && !includeStyles && !includeDefaults) {
-            getOwnProperty(name)
-        } else {
-            getRefProperty(name, inherit, includeStyles, includeDefaults)
-        }
+        ): MetaItem? = getRefProperty(name, inherit, includeStyles, includeDefaults)
 
         override var parent: VisionGroup?
             get() {