-----Original Message-----
From: Michael Kay
Since you're using XSLT 2.0 I would assume that you are
doing the grouping using xsl:for-each-group. A useful
technique here is to use a function to calculate the grouping key:
<xsl:for-each-group select="item" group-by="f:grouping-key(.)">
<xsl:result-document ...
</xsl:result-document>
</xsl:for-each-group>
<xsl:function name="f:grouping-key" as="xs:string">
<xsl:param name="item" as="element(item)"/>
<xsl:variable name="ranges">
<range from="A" to="G"/>
<range from="H" to="L"/>
<range from="M" to "P"/>
<range from="Q" to "Z"/>
</xsl:variable>
<xsl:sequence select="$ranges/range
[string(@from) lt substring($item/artist,1,1) and
string(@to) ge substring($item/artist,1,1)]/@from"/>
</xsl:function>
I hope this gives you some ideas about how to tackle the
problem. You could of course read the table of ranges from
a secondary input document to make it more flexible, or you
could calculate it as a function of the input data.
I found this intriguing... and not exactly clear (to me at least).
Test input
<?xml version="1.0" encoding="UTF-8"?>
<categories>
<item>
<artist>Sbout the Moon</artist>
<title>Carved in Stigmata Wounds</title>
</item>
<item>
<artist>Satyricon</artist>
<title>Rebel Extravaganza</title>
</item>
<item>
<artist>Secrets of the Moon</artist>
<title>Carved in Stigmata Wounds</title>
</item>
</categories>
stylesheet:
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="group"/>
<xsl:template match="categories">
<xsl:for-each-group select="item" group-by="f:grouping-key(.)">
<xsl:value-of select="substring(artist,1,1)"/>
</xsl:for-each-group>
<xsl:apply-templates select="item"/>
</xsl:template>
<xsl:template match="item">
<xsl:message>
<xsl:value-of select="f:grouping-key(.)[1]"/>
</xsl:message>
</xsl:template>
<xsl:function name="f:grouping-key" as="xs:string">
<xsl:param name="item" as="element(item)"/>
<xsl:variable name="ranges">
<range from="A" to="G"/>
<range from="H" to="L"/>
<range from="M" to= "P"/>
<range from="Q" to= "Z"/>
</xsl:variable>
<xsl:sequence select="$ranges/range
[string(@from) lt substring($item/artist,1,1) and
string(@to) ge substring($item/artist,1,1)]/@from"/>
</xsl:function>
Comments:
1. If the item/artist are not lexically sequential it bombs.
2. I don't understand the grouping, hence the item template,
which shows outptu I don't understand either.
Anyone care to explain further please?
TIA daveP.
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