conditional match

I would like to insert a conditional statement in my XSLT that if or when
true would cause a template match:

For instance:

<xsl:choose>
     <xsl:when test="$TRANSFORMER_Platform='test'">
          <xsl:call-template name="zoom"/>
     </xsl:when>
</xsl:choose>

thus,

<xsl:template  name= "zoom" match="/././>
     <xsl:element name="zoom">
          <xsl:value-of select="number() div .25"/>
     </xsl:element>
</xsl:template>


However, I assume that inserting the match causes the template to
automatically be executed even without the when being true. If I remove it
though, I am not sure how to match the node I want.


Maybe I am barking up the wrong tree completely. Any suggestions?






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