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HI, I would like to understand, given a flat sort of data extraction,
of the type
<?xml version="1.0" encoding="UTF-8"?> <root> <data> <name>Aname</name> <!-- other elements such as <location> follow, all related to the <name> --> </data> <data> <name>Hname</name><!-- other elements such as <location> follow --> </data> <data> <name>Dname</name><!-- other elements such as <location> follow --> </data> <data> <name>Wname</name><!-- other elements such as <location> follow --> </data> <data> <name>Anothername</name><!-- other elements such as <location> follow --> </data> <data> <name>Whatevername</name><!-- other elements such as <location> follow --> </data> </root> what are the groupings and keys needed to accomplish this (even flatter) output? <output> <letter>A</etter> <name>Aname</name><!-- other elements such as <location> follow --> <name>Anothername</name><!-- other elements such as <location> follow --> <letter>D</etter> <name>Dname</name><!-- other elements such as <location> follow --> <letter>H</etter> <name>Hname</name><!-- other elements such as <location> follow --> <letter>W</etter> <name>Wname</name><!-- other elements such as <location> follow --> <name>Whatevername</name><!-- other elements such as <location> follow --> <output> I know that I first need to identify which first letters exist in the set of <data> elements, and then generate a <letter> element containing that first letter, followed by all the data elements children <name> that have a matching first letter. But I'm getting a <letter> element every time, rather than once for each unique occurrence, followed by the <name> elements which have a matching first letter. How do I generate the <letter> once, but follow it with all of the <name> (and related) elements? I think I need to move the <leter> element builder up out of the for-each loop that it is in, but I don't know how I then would get each letter only once for the set of all <data> elements. <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"> <xsl:template match="/"> <xsl:variable name="blocks" select="root/data"/> <xsl:element name="output"> <xsl:for-each-group select="$blocks" group-by="name"> <xsl:sort select="current-grouping-key()"/> <xsl:variable name="currentGroup" select="current-grouping-key()"/> <xsl:variable name="headletter" select="substring($currentGroup,1,1)"/> <xsl:for-each select="."><!-- context here should be data --> <xsl:element name="letter"> <xsl:value-of select="$headletter"/> </xsl:element> <xsl:apply-templates select="name[substring(.,1,1)=$headletter]"></xsl:apply-templates> </xsl:for-each> </xsl:for-each-group> </xsl:element> </xsl:template> <xsl:template match="name">
<!-- is there a way that I should use the $headletter here? -->
<xsl:element name="name"><xsl:value-of select="."/></xsl:element>
</xsl:template>
</xsl:stylesheet>output with duplicate <letter> values:
<?xml version="1.0" encoding="UTF-8"?>
<output>
<letter>A</letter>
<name>Aname</name>
<letter>A</letter>
<name>Anothername</name>
<letter>D</letter>
<name>Dname</name>
<letter>H</letter>
<name>Hname</name>
<letter>W</letter>
<name>Whatevername</name>
<letter>W</letter>
<name>Wname</name>
</output>Regards, Dorothy
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