ID of HTML control must have value of XML tag

In an XSL-template I try to create a HTML weblink (<a href=... id=...>).
The link must have an ID that has the value of an XML-tag.
How can I do that?

<xsl:template match="Person">
 <a href="http://www.somewebpage.com"; id="???"><xsl:value-of 
select="Nr"/></a>
</xsl:template>

So "???" must be replaced by the value of XML-tag "Nr".
But how or what?

Thanks.
Ilse







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