Namespaces "...TR/TD" and "...Transform"

Friends,

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

have some difference with this:
"<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">" ???


I know that some syntaxes are diferents, and I thinked that a stylesheet
that use the namespace "....Transform" was XSLT.
I'm wrong?
Can I to consider XSLT, a stylesheet for output html that use the namespace
"<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl">"???

Thanks again.

Paulo.


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