name of DTD file actually used

Hi,

for a long time I've been wanting to write a function that finds the
DTD file pertaining to the sgml file I am editing. Such as
"sgml-find-dtd-file". I have, however not been able to find a variable
that holds the name of the file psgml's entity manager has worked out
must contain the DTD to use.

Come to think of it, a DTD is not necessarily contained in one file;
it might be spread over several ones or even be contained in the
internal subset. However, it should still be possible to work out the
name of any file(s) that contain the document type definition or parts
of it.

Any suggestions?

Thanks a lot, Florian



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