Merging an imported xsd schema into the importing xsd

As the subject said I want to textually merge an imported
schema sub.xsd into the importing schema main.xsd.
Afterwards only one schema file should exist.

Is there a simple way in XSLT (2.0) to achieve this with XSLT?

Otherwise I guess I have to include the imported schema file
and to replace the old namespace prefixes by these prefixes used in the
main.xsd.

Is the namespace replacement sufficient or do I have something more?

How do I replace the prefixes with XSLT?

Matt
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