xsl self-documentation on the fly (Perl?)

Greetings,

I am trying to create xsl transformation templates with a feature that
documents that they have been applied (on an xml file) and where they have
been applied (either node or line number in the text).  It would be ideal if
this documentation could be in a seperate file that is a log of all changes
in the original xml files.  

Any suggestions would be greatly appreciated.

Thanks-
John Greek


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