apolying xsl:key to similar looking node names

Hi Again ,

<data>
    <companies>
       <agent>
            <agentname>AAA</agentname>
       </agent>
       <agent>
           <agentname>BBB</agentname>
                    <companies>
                          <agent>
                    	<agentname>CCC</agentname>
                          </agent>
                          <agent>
 		<agentname>DDD</agentname>
	          </agent>
	   </companies>
       </agent>
    </companies>
</data>


I was wondering in the above xml is there a way to apply xsl:keys for "same Nodenames" across whole xml ..IN
this case it is <agentname> so that i can pull out data across whole xml from the node <agentname> no matter 
wherever  down the tree it may appear.

Thanks
-kumar



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