I have an identity transform that attempts to group elements at a deeply
nested level, but I am having trouble accomplishing this. The xslt performs
the identity transform and sorts the result tree on a few levels, all
successfully. The problem occurs when I attempt the deep-level grouping.
Given the following source tree sample:
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="offices.xsl" ?>
<locations version="1.0">
<divisions>
<division id="B">
<regions>
<region name="europe">
<countries>
<country name="England">
<offices>
<office id="BR4">
<names>
<name lang='en'>Branch 4</name>
</names>
<address>
<line>26 Abbey Lane</line>
<line>London</line>
</address>
<cities>
<city>London</city>
</cities>
<phone>+44-22-2222 2222</phone>
</office>
<office id="BR5">
<names>
<name lang='en'>AAAAA Branch 4</name>
</names>
<address>
<line>7 Kings Highway</line>
<line>London</line>
</address>
<cities>
<city>London</city>
</cities>
<phone>+44-99-9999 9999</phone>
</office>
<office id="BR6">
<names>
<name lang='en'>Branch 4</name>
</names>
<address>
<line>22 Abbey Lane</line>
<line>London</line>
</address>
<cities>
<city>London</city>
</cities>
<phone>+44-55-555 5555</phone>
</office>
</offices>
</country>
</countries>
</region>
</regions>
</division>
</divisions>
</locations>
...the xslt should produce the following result tree:
<?xml version="1.0" encoding="UTF-8"?>
<locations>
<divisions>
<division id="B">
<regions>
<region name="europe">
<countries>
<country name="England">
<cities>
<city>
<name>London</name>
<offices>
<office>
<names>
<name lang='en'>AAAAA Branch 4</name>
</names>
<location>
<address>
<line>7 Kings Highway</line>
<line>London</line>
</address>
<phone>+44-99-9999 9999</phone>
</location>
</office>
<office>
<names>
<name lang='en'>Branch 4</name>
</names>
<location>
<address>
<line>22 Abbey Lane</line>
<line>London</line>
</address>
<phone>+44-55-555 5555</phone>
</location>
<location>
<address>
<line>26 Abbey Lane</line>
<line>London</line>
</address>
<phone>+44-22-2222 2222</phone>
</location>
</office>
</offices>
</city>
</cities>
</country>
</countries>
</region>
</regions>
</division>
</divisions>
</locations>
The <office> elements contain all child elements where the
office/names/name[(_at_)lang='en'] values match. Further, a new element --
<location> has been added as a child to <office>. The goal is to have only one
<names> element under an <office> element for each unique occurrence of
names/name where @lang='en' -- in other words, group all office locations by
their common English office name, then copy all location-specific information
for each office to the result tree as new <location> elements underneath the
<office> element.
My current XSLT is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">
<xsl:output method="xml" encoding="UTF-8" indent="yes"/>
<xsl:key name="by-city" match="temp/office/cities/city" use="."/>
<xsl:template match="/">
<locations>
<divisions>
<xsl:for-each select="locations/divisions/division">
<xsl:sort select="@id"/>
<division id="{(_at_)id}">
<regions>
<xsl:for-each select="regions/region">
<xsl:sort select="@name"/>
<region name="{(_at_)name}">
<countries>
<xsl:for-each select="countries/country">
<xsl:sort select="@name"/>
<country name="{(_at_)name}">
<xsl:variable name="rtf">
<temp>
<xsl:copy-of select="offices/office"/>
</temp>
</xsl:variable>
<xsl:for-each
select="msxsl:node-set($rtf)/temp/office/cities/city[generate-id(.) =
generate-id(key('by-city', .)[1])]">
<xsl:sort select="."/>
<cities>
<city>
<name>
<xsl:value-of select="."/>
</name>
<offices>
<xsl:for-each
select="key('by-city', .)">
<xsl:sort
select="../../names/name[(_at_)lang='en']"/>
<xsl:sort
select="../../address"/>
<xsl:if
test="../../names/name[(_at_)lang='en']
!=../../preceding-sibling::names/name[(_at_)lang='en']">
<!-- <office> new <office>
element should be inserted here -->
<xsl:copy-of
select="../../names"/>
</xsl:if>
<location>
<xsl:copy-of
select="../preceding-sibling::address"/>
<xsl:copy-of
select="../following-sibling::phone"/>
</location>
<!-- </office> if the current
node is the last in a group with the same /names/name[(_at_)lang='en'] value,
then
closing tag should be inserted here -->
</xsl:for-each>
</offices>
</city>
</cities>
</xsl:for-each>
</country>
</xsl:for-each>
</countries>
</region>
</xsl:for-each>
</regions>
</division>
</xsl:for-each>
</divisions>
</locations>
</xsl:template>
</xsl:stylesheet>
...and my result tree looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<locations>
<divisions>
<division id="B">
<regions>
<region name="europe">
<countries>
<country name="England">
<cities>
<city>
<name>London</name>
<offices>
<location>
<address>
<line>7 Kings Highway</line>
<line>London</line>
</address>
<phone>+44-99-9999 9999</phone>
</location>
<location>
<address>
<line>22 Abbey Lane</line>
<line>London</line>
</address>
<phone>+44-55-555 5555</phone>
</location>
<location>
<address>
<line>26 Abbey Lane</line>
<line>London</line>
</address>
<phone>+44-22-2222 2222</phone>
</location>
</offices>
</city>
</cities>
</country>
</countries>
</region>
</regions>
</division>
</divisions>
</locations>
The missing pieces are unique <names> elements (selected according to the
above-specified criteria) and the appropriate placement of <office> elements
(encapsulating <names> and <location> elements).
I appreciate any help that can be offered!
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