Oh what the heck, apply this to any XML doc (eg itself)



<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0"
                >

<xsl:output method="xml" indent="yes"/>


<xsl:template match="/">
<xsl:call-template name="x">
 <xsl:with-param name="string" select="'fooBarJones'"/>
</xsl:call-template>
</xsl:template>

<xsl:template name="x">
 <xsl:param name="string" />
 <xsl:if test="$string">
 <xsl:variable name="x" select="substring($string,1,1)"/>
 <xsl:variable name="y" select="translate($x,'abcdefghijklmnopqrstuvwxyz',
                                  'ABCDEFGHIJKLMNOPQRSTUVWXYZ')"/>
 <xsl:if test="$x=$y">_</xsl:if>
 <xsl:value-of select="$y"/>
  <xsl:call-template name="x">
   <xsl:with-param name="string" select="substring($string,2)"/>
  </xsl:call-template> 
 </xsl:if>
</xsl:template>

</xsl:stylesheet>


Jeni

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