Xsl in xml

Hello,

I'm developing a tool that transform an xml file to xsl file by ussing a xsl
file.
I do this to generate xsl files.

XMLfile + XslFile ---XSLT---> XslFile.

My question is how can I process an XML file that contains xsl code.

because when i add a xsl code i have the following error message:

The namespace prefix "xsl" was not declared.



PS :I used Xercess for parsing and Xalan for processing


Thanks you for your Help.
Rachid



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