parent-document in nxml mode?

[Stephen Langer]

Hi --

I'm just switching from psgml to nxml for editing xml files.  In  
psgml, I could set sgml-parent-document in a file to indicate that it  
was included in another file.  Is it possible to do something similar  
in nxml-mode?  The parent file contains entity definitions that are  
used in the child files, and without the definitions nxml mode thinks  
that the child documents aren't valid.

Thanks,
      Steve

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