* (e.g. those defined by mix:referenceable, mix:versionable,
* mix:lockable, et.al.)
*
* todo FIXME delegate to 'node type instance handler'
*/
PropDefId defId = srcChildState.getDefinitionId();
PropDef def = ntReg.getPropDef(defId);
if (def.getDeclaringNodeType().equals(NameConstants.MIX_LOCKABLE)) {
// skip properties defined by mix:lockable
continue;
}