Match multiple times output once

Hi
I am having trouble with xsl:call-template. 
<xsl:for-each select="relation[attribute::className='a']">
        <xsl:call-template name="b1_u_populate">
                <xsl:with-param name="rhs"><xsl:value-of  
select="node[attribute::className='b']/PartNumber"/></xsl:with-param>
        </xsl:call-template>
</xsl:for-each>
I have multiple relation child element of the root element. I want to call 
call-template only once. So whenever the above condition is true and the 
xsl:call-template is called once the loop shold be existed. Can you please 
suggests me any solution.

Thanks,
Navpreet



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