Generating Trees from XML Schema

The subject is misleading because I don't have 
a more precise term for the question, in fact, 
that is part of the question:

1.  Is there a means to generate a complete 
    node list (all elements and attributes regardless 
    of structure) for a given XML Schema including 
    restrictions, extensions, etc?  In other words, 
    any element or attribute that the Schema validly 
    declares?

2.  Is there a name for such a thing?

3.  Are there existing products that do this 
    and emit this list?  Open source preferred.

Thanks!

len