<xsl:stylesheet xmlns:xsl=" ?????">

Hi Friends,
During the journey to solve my problem: 
http://www.geocities.com/marcos_coelho/xml/doubt.htm
which is not solve  but It's better because of help of some XML's List
friends), I visited many sites.

In <xsl:stylesheet xmlns:xsl=" URL">
I saw many differents addresses in place of URL ?
So my question Is URL makes any difference on the XSL file
transformation ?

Thanks in Advance
Marcos Coelho

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