[xsl] variable declaration

["william locksman" <vsd18@xxxxxxxxxxxxxx>]

hi
the namespace
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl";>
doesnt allow me to use <xsl:variable>
in that case how do i declare variables??

and why is that it <xsl:variable> can not be used in the namespace 
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl";>????

2nd question.. following Mike's answer to Suman's question, how do 
we declare dtd for xsl and define space ??

forgive me if my questions are very basic.

thanks

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