<xsl:with-param name="right">
<xsl:value-of select="substring($right, 3)"/>
</xsl:with-param>
it's a comon mistake to use with-param or xsl:variable with conttent an
xsl:value-of but it's almst always better to instead do
<xsl:with-param name="right" select="substring($right, 3)"/>
as apart from being easier to type it makes a string which is a
relatively lightweight object as opposed to a resul tree fragment
with a root node and a child text node with string value the string you
want, which is more expensive to build, and more expensive to use.
Probably, depending on your use case, I wouldn't have had a left
parameter and just output the string as you go along rather than
concatenating the result into left at each stage
<xsl:template name="hex2path">
<xsl:param name="right"/>
<xsl:choose>
<xsl:when test="(string-length($right) > 2)">
<xsl:value-of select="concat(substring($right, 1, 2), '/')"/>
<xsl:call-template name="hex2path">
<xsl:with-param name="right" select="substring($right,
3)"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$right"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
David
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