Doubt

Hi
as i am new to xml and xsl, i find this very strange

if i write 

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

gives me a different output on HTML as compared to 

<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl">


can ne one help me

thanks


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