[xsl] Variables in match expressions

["António Mota" <amsmota@xxxxxxxxx>]

I'm doing a Identity transform in wich i define a template like

	<xsl:param name="pos"/>
	<xsl:variable name="snode" select="(//*)[$pos]"/>
        ...
		<xsl:template match="*[count(.|$snode)=1]">
			...
		</xsl:template>

It seems Xalan (under jEdit) and transformiix (Firefox) have no
problem with that, but MSXML (IE) says

"Variables may not be used within this expression"

Who is right about it?

Thanks.