Can't you just replace
<xsl:otherwise>
<token> <xsl:value-of select="$string" /></token>
</xsl:otherwise>
by
<xsl:when test="contains($string,'yyyyyy')">
<token><xsl:value-of select="substring-before($string,
'yyyyyy')"/></token>
<token>yyyyyy</token>
<token><xsl:value-of select="substring-after($string, 'yyyyyy')"/>
</token>
</xsl:when>
<xsl:when test="contains($string,'xxxxx')">
<token><xsl:value-of select="substring-before($string, 'xxxxx')"/></token>
<token>xxxxx</token>
<token><xsl:value-of select="substring-after($string, 'xxxxx')"/> </token>
</xsl:when>
<xsl:otherwise>
<token> <xsl:value-of select="$string" /></token>
</xsl:otherwise>
of if there is a possibility of more than one nested xxxx have the same
but calling a named template similar to your existing one that splits on
any nested xxxxs.
David
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