how to read attribute if defined as <namespace>:<attna

here is sample xml document, I want to read the value of attribute xmlns.Res 
using XSL stylesheet 

<?xml version="1.0" ?> 
<PT xmlns.Res="PT_MSG"> 
....
</PT>

here's my stylesheet
<?xml version="1.0"?>
<xsl:stylesheet  version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" indent="yes" />

		<xsl:template match="HFPT" 
xmlns="http://www.w3.org/XML/1998/namespace"> 
		<xsl:copy-of select="@xmlns:Res" />
	        </xsl:template>

</xsl:stylesheet>

I tried <xsl:copy-of select="@xmlns:Res" />, I got error message -
"Namespace prefix xmlns has not been declared".

So how can I do it in XSL ?

Any solution will be appreciated.

Thanks

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