DOMSourceAnydata marked as private and hence unusable

We are trying to parse "anydata" node as part of the "get-data" rpc defined in ietf-netconf-nmda.yang. On trying to cast AnydataNode to DOMSourceAnydata, we found that the DOMSourceAnydata is private. Shouldn't this be public so that developers can use it for AnydataNode normalization?

Also, could not find AnydataNodeBuilders to build AnydataNode objects for use in Subtree filtering.

highstreetherbert , FYI...