ODM12 — Erroneous association in definition of Document?

The second association for class Document in the RDF metamodel (Section 10.8.1) is to Namespace, with role name xmlBase. The association's name is DefaultNamespaceForDocument. There is no corresponding association for Namespace (10.8.2). Association DefaultNamespaceForDocument exists between classes Source and Namespace. That role name is defaultNamespace, not xmlBase. Source has an association with role name xmlBase, but the associated class is IRI.

Given that an association to Namespace exists in a superclass of Document, the xmlBase association is either redundant or a specialization that needs to be further described.

Also, should the association between Source and Namespace be named DefaultNamespaceForSource instead of DefaultNamespaceForDocument?