XMetadatable

Hello,

I am not able to get an XMetadatable interface from XTextDocument or
TextEmbeddedObject.  UnoRuntime.queryInterface returns null.

What OOO Writer components, if any, currently implement XMetadatable?  I've
searched extensively and found documentation on the rdf API, and how it is
implemented in ODF, but no info about which components implement the
interface.

I'm using Openoffice 3.0.1 on Windows.

I appreciate the help,

mb