concat 2

I try to get the value of VdkVgwKey just after param? but I obtain
nothing. what is the syntax??
<xsl:template match="CHAMP[(@NAME='VdkVgwKey')]">
 <A href="http://pc_merle/servlets/param?{text()/}">
         <xsl:value-of select="../CHAMP[(@NAME='TITRE')]"/>
 </A>
 </xsl:template>


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