Hi,
I am stuck on a transformation that requires me to group and sub-group
a set of nodes based on their child nodes. My starting XML is as
follows:
-------------- SOURCE ---------------
<?xml version="1.0"?>
<video-files>
<video-file>
<language>English</language>
<format>Real</format>
<bandwidth>Low</bandwidth>
</video-file>
<video-file>
<language>English</language>
<format>Real</format>
<bandwidth>High</bandwidth>
</video-file>
<video-file>
<language>English</language>
<format>QuickTime</format>
<bandwidth>Low</bandwidth>
</video-file>
<video-file>
<language>English</language>
<format>QuickTime</format>
<bandwidth>High</bandwidth>
</video-file>
<video-file>
<language>French</language>
<format>Real</format>
<bandwidth>Low</bandwidth>
</video-file>
<video-file>
<language>French</language>
<format>Real</format>
<bandwidth>High</bandwidth>
</video-file>
<video-file>
<language>French</language>
<format>QuickTime</format>
<bandwidth>Low</bandwidth>
</video-file>
<video-file>
<language>French</language>
<format>QuickTime</format>
<bandwidth>High</bandwidth>
</video-file>
</video-files>
-------------------------
And the final XML is to be as follows:
---------- FINAL ---------
<?xml version="1.0"?>
<languages>
<language>
<name>English</name>
<formats>
<format>
<name>Real</name>
<bandwidths>
<bandwidth>
<name>High</name>
</bandwidth>
[...]
</bandwidths>
</format>
[...]
</formats>
<language>
[...]
</languages>
-----------------------------
I have searched the list for some pointers to a solution for this
problem and I have found plenty on grouping and sub-grouping but I have
had limited success in applying the techniques to my situation. The
initial grouping of the languages is no problem, but I am not sure how
to approach the sub-grouping on the current language group into format
groups, and then sub-group each of these into the bandwidth groups. I
have a feeling that I need to generate keys for the different
language/format/bandwidth combinations, but I am not sure how to
implement this. For what it's worth my current XSLT is as follows:
------------ XSLT -------------
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:key name="languages" match="video-file" use="language"/>
<xsl:key name="formats" match="video-file" use="concat(language, '+',
format)"/>
<xsl:key name="bandwidths" match="video-file" use="concat(language,
'+', format, '+', bandwidth)"/>
<xsl:template match="video-files">
<languages>
<xsl:for-each
select="video-file[generate-id(.)=generate-id(key('languages',
language)[1])]">
<xsl:for-each select="key('languages',
language)">
<xsl:sort select="format"/>
<language>
<xsl:if test="position() = 1">
<name><xsl:value-of
select="language"/></name>
</xsl:if>
<formats>
<!--- Need to do sub
grouping here -->
</formats>
</language>
</xsl:for-each>
</xsl:for-each>
</languages >
</xsl:template>
</xsl:stylesheet>
--------------------------------
If anyone has any advice on the best way to approach this problem (XSLT
1.0 only if possible), I would appreciate it.
Thanks,
Robin