Tools for comparing/merging schemas?

["HILLMAN, Tomos" <tomos.hillman@oup.com>]

Hi List,

I've been asked to start a project looking at potentially merging from several to a single data model.  Are there any tools that anyone can recommend for comparing (i.e. identifying conflicts between) schemas?

The data models in question are already somewhat modularized, with some shared content, and are currently defined by/validated against a set of DTDs (with some complex entity based inclusion) - but I'm more than happy to convert to schema or RELAX NG if there are good schema language specific tools out there.  There are currently some elements which are 'extended' in one data model compared to others, and some where the definitions are completely different.

Thanks in advance!

Tom
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