Content Assist on org.w3c.Document content assist is wrong, should use the default Freemarker XML model wrapper conventions

In Freemarker 1.1.0.v20110303-1225-H55-Alpha1
Eclipse platform version: 3.6.2.r362_v20110210-9gF78Gs1FrIGnHDHWkEcopoN8AmxeZflGDGKQi
Build id: M20110210-1200

Putting a context model that includes a DOM object (org.w3c.Document) and using content assist provides the wrong content suggestions:
Instead of using the DOM object wrapper (e.g. by providing also an XSL schema or a sample XML) it produces the properties of the Document class

This requires an enhancement to the context tab, allowing to add an XSD or a sample XML to be used as a base for the correct content assist