YangModeledAnyxmlSchemaNode is a relic of a design, where this kind of node was treated specially for various XML/JSON interface tricks.

These days we have ForeignDataNode to mediate data exchange. The semantics of this node are readily available from examination of substatements, so we are not losing anything there.

There is actually a notable gap in support for this node, which cannot really be serialized by the datastore – hence it really was never functional.

Remove this construct and all special handling it receives.