XSLT to XSLT

Hi,
       I need to create one xslt file that produce another xslt file.
       The first xslt file is used to parse one xml file with some norms
       The second have the rules to analyze another xml registry that
will originate another xml with the result...

   My problem is create the second xslt from first.

Have You some knowledge about how do this?
Thanks.
bll

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