I created an RNG schema modification file, as described at http://www.docbook.org/docs/howto/, and using jing I can validate a demo document against it. Next, I tried to create a DTD from my modification file using trang, but got a lot of errors. Even using trang to try to convert docbook-5.0\rng\docbook.rng with no reference to modifications, I get about 100 error messages. Most say 'error: sorry, cannot handle this kind of "choice"', but many follow this format: sorry, not handled: duplicate declaration of element "info" from namespace "http://docbook.org/ns/docbook"; Were the official distribution DTD versions created using an automated tool, and if so, which one? thanks, Bob
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