rees|sides">
        <xsl:variable name="val">
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                <xsl:value-of select="'null'"/>
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            <xsl:if test = "number(text()) = text()">
                <xsl:value-of select="text()"/>
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                <xsl:value-of select="concat($quot, text(), $quot)"/>
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        <xsl:value-of select="concat($quot, preceding-sibling::index,
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            <xsl:text>,</xsl:text>
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    </xsl:template>
</xsl:stylesheet>r