Program to evaluate a set of DTD files

Hi
Given a set of DTD files, with entities and parameter entities in two or more
files, including entities redefined in more than one place (overridden), is
there a way to ask a parser to describe the net effect for each element?
For instance, can XSLT ask the parser for the allowed elements or attributes
in a given element, and the actual element rule, example:
-   title contains  (#PCDATA | b | i )*

The purpose of this is to test that the result of using a given DTD is still
unchanged after I change the entities, by for instance, replacing some text
with a parameter entity.

Thanks,
Rob

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Rob Echlin, Documentation Systems Architect, Wind River
+1.613.270.5796 | Skype: rob.echlin.wr
WR Jive - https://communities.windriver.com/people/rechlin