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<xsl:stylesheet version='1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match='/'>
<xsl:text>The document contains </xsl:text>
<xsl:call-template name='add'>
<xsl:with-param name='nodes' select='//text()'/>
</xsl:call-template>
<xsl:text> characters.
</xsl:text>
</xsl:template>
<xsl:template name='add'>
<xsl:param name='sum' select='0'/>
<xsl:param name='nodes' select='/..'/>
<xsl:choose>
<xsl:when test='not($nodes)'>
<xsl:value-of select='$sum'/>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name='add'>
<xsl:with-param name='sum'
select='$sum + string-length($nodes[1])'/>
<xsl:with-param name='nodes'
select='$nodes[position() != 1]'/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
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