problem with id() function

Hello,
     Can anybody please suggest me why id() function
is not working.

<xsl:for-each select="id(connection/@pinref)">

                     <xsl:value-of
select="../@name"/>:

<xsl:value-of select="@name"/>

</xsl:for-each>

Note: connection/@pinref returns set of node set.

regards,
Ranjan

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