Use XSL to generate dynamic XSL that is executed within the same script?

<xsl:for-each select="//constants/constant" >
        <xsl:variable >
            <xsl:attribute name="name">
              <xsl:value-of select="@name"/>
            </xsl:attribute>
          <xsl:attribute name="select">
            <xsl:value-of select="@value"/>
          </xsl:attribute>
        </xsl:variable>
      </xsl:for-each>

xsl:namespace-alias

<v name="myVarName">myValue</v>

<resgroup id="constants" >
   <resbundle>
     <res id="var1">var1Value</res>
   </resbundle>
   <resbundle>
    <res id="var2">var2Value</res>
   </resbundle>
</resgroup>

<resgroup id="constants" >
   <resbundle>
     <res id="var1">var1Value</res>
   </resbundle>
   <resbundle>
    <res id="var2">var2Value</res>
   </resbundle>
</resgroup>

<xsl:stylesheet
   version="1.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:metaxsl="my:metaxsl"
   exclude-result-prefixes="metaxsl"

  <xsl:namespace-alias result-prefix="xsl" stylesheet-prefix="metaxsl" />


  <xsl:template name="BuildInstantiateConstantsTemplate_tmpl">
    <metaxsl:template match="/" name="instantiateConstants_tmpl">
      <metaxsl:template>
        <xsl:for-each select="//resgroup[@id='constants']/resbundle/res">
          <metaxsl:variable>
        <xsl:attribute name="name">
          <xsl:value-of select="@id" />
        </xsl:attribute>
        <xsl:attribute name="select">
          <xsl:value-of select="text()" />
        </xsl:attribute>
      </metaxsl:variable>
    </xsl:for-each>
  </metaxsl:template>
</metaxsl:template>
  </xsl:template>


  <xsl:template match="/">
    <xsl:call-template name="BuildInstantiateConstantsTemplate_tmpl" />
  </xsl:template>