No, not currently. Should be easy to add, though. Just add a method (or property?) to the RelaxNG class that retrieves the in-memory tree. Maybe the XMLSchema class could do the same? I'd prefer a string result over writing to a file, BTW. It's easy to write a string to a file, but it's overhead to read in a file when all you wanted is a string.

Certainly, a string is better than writing to a file.

Oh, and: I assume building an ElementTree from the internal RelaxNG schema is not a good idea, as it could interfere too much with the validation. Copying them first /might/ work, though.

If the RelaxNG class returns a merged XML string, then that could be passed into the ElementTree parse method for navigation. That seems like an elegant solution.