// find the binding containing this mapping
String uri = qname.getUri();
BindingHolder hold = m_directory.getBinding(uri);
if (mainmapping.isAbstract()) {
hold.addTypeNameReference(uri, uri);
}
// check for superclass mapping to be extended (do this first for compatibility with schema type extension)
StructureElement struct = null;
String ptype = detail.getExtendsType();