Variable for an Elementname

Hello,

I got this problem here. I use a template and pass a parameter. This
parameter shall be part of an element name. However it says the element
name has to be a QName.


<xsl:template name="NumberInformationTemplate">
	<xsl:param name="ninfo"/>

	<xsl:variable name="numberinfo"
select="concat($ninfo,'NumberInformation')"/>

	<xsl:element name="$numberinfo">
	....


I don't see why this is not working...

Any comments?
Thanks
Houman