[xsl] selecting a perticular node

hi,
i have a XML file :
<actors>
 <actor id="3"/>
 <actor id="5"/>
 <actor id="2"/>
 <actor id="1"/>
 <actor id="6"/>
 <actor id="7"/>
</actors>

I want to write a XPATH expression which will return me the node having
smallest value of attribute "id"
     e.g. <xsl:value-of select="<actor> having smallest id value" />

thanks,
dhiraj





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