DOCBOOK-APPS: Case sensitivity in PSGML...

Hi,

really hope I'm not off topic. I'm trying to use XEmacs with PSGML to edit
DocBookX documents. When I enter xml-mode, and press the right mouse 
button somewhere in the text to get allowed elements, XEmacs says this:

...docbookx/ent/iso-tech.ent line 1 col 13 entity pagenum.attrib
...docbookx/dbpoolx.mod line 741 col 32 entity dbpool
...docbookx/docbookx.dtd line 91 col 8 entity article
spec.xml line 1 col 69 
Uppercase keyword expected (found cdata); at: 		#IMPLIED

I really can't figure out what's the meaning of this, but the result is
quite clear: nothing works!

Many thanks

					Andrea