Link Generation using keys

Within a template want to generate links using key values like below:
<xsl:template name="x">
 <xsl:param name="id" select="1" />
 <xsl:for-each select="key('ids', $id)">
 <xsl:element name="a">
  <xsl:attribute name="href"><xsl:value-of select="id"/></xsl:attribute>
  <xsl:text><xsl:value-of select="title"/></xsl:text>
 </xsl:element>
...
</xsl:template>

This does not work - there are no links generated; what would be the proper way  to access the values ?

Thanks

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