lookup.key — Retrieve the value associated with a particular key in a table
Given a table of space-delimited key/value pairs,
the lookup.key template extracts the value associated
with a particular key.
<xsl:template name="lookup.key">
<xsl:param name="key" select="''"></xsl:param>
<xsl:param name="table" select="''"></xsl:param>
<xsl:if test="contains($table, ' ')">
<xsl:choose>
<xsl:when test="substring-before($table, ' ') = $key">
<xsl:variable name="rest" select="substring-after($table, ' ')"></xsl:variable>
<xsl:choose>
<xsl:when test="contains($rest, ' ')">
<xsl:value-of select="substring-before($rest, ' ')"></xsl:value-of>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$rest"></xsl:value-of>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="lookup.key">
<xsl:with-param name="key" select="$key"></xsl:with-param>
<xsl:with-param name="table" select="substring-after(substring-after($table,' '), ' ')"></xsl:with-param>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</xsl:template>