Help with XSLT Transformation - xslt

Question

I was hoping I could get a little assistance with an XSLT transform. I can't seem to get it right.
Here is a sample of the source xml document:
<?xml version="1.0" encoding="UTF-8"?>
<Locations>
<header>
<location>Location Field</location>
<job_function>Job Function Field</job_function>
<count>Count</count>
</header>
<data>
<location>2177</location>
<job_function>ADM</job_function>
<count>1</count>
</data>
<data>
<location>2177</location>
<job_function>OPS</job_function>
<count>1</count>
</data>
<data>
<location>2177</location>
<job_function>SLS</job_function>
<count>5</count>
</data>
<data>
<location>2179</location>
<job_function>ADM</job_function>
<count>1</count>
</data>
<data>
<location>2179</location>
<job_function>SEC</job_function>
<count>1</count>
</data>
</Locations>
I want to transform it into the following format:
<Locations>
<data>
<PeopleSoftID>2177</PeopleSoftID>
<ADM>1</ADM>
<OPS>1</OPS>
<SLS>5</SLS>
<TotalCount>7</TotalCount>
</data>
<data>
<PeopleSoftID>2179</PeopleSoftID>
<ADM>1</ADM>
<SEC>1</SEC>
<TotalCount>2</TotalCount>
</data>
</Locations>
So basically, as you can see in the sample source document there are multiple elements that have the same value. In the destination document, there should now only be one record (<PeopleSoftID> element) per <location> element value in the source document. Since there were 3 <location> elements with the value of 2177, the destination document now has just 1 <PeopleSoftID> element that contains that value. The value of the <job_function> element in the source document becomes an element in the destination document. The value of that new element ends up being the sibling value of the <count> element from the source document. The <TotalCount> element in the destination document is the SUM of the values of all the new elements that are generated from the source <job_function> element.
I hope that explanation did not confuse anybody =).
I am a little new to XSLTs still so I am having trouble getting the logic right on this.
I can only use XSLT 1.0 too.
If I did not provide enough information let me know, and I will try to provide more as soon as I am able.
Thanks guys!

Answer 1

Read up on xsl:key and grouping with the Muenchian Method
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes" />
<!--Group the data elements by their location values -->
<xsl:key name="data-by-location" match="data" use="location" />
<xsl:template match="Locations">
<xsl:copy>
<!--Get a distinct list of location values,
using the Muenchian Method -->
<xsl:for-each
select="data[generate-id() =
generate-id(key('data-by-location', location)[1])]">
<xsl:copy>
<PeopleSoftID>
<xsl:value-of select="location"/>
</PeopleSoftID>
<!--For every data element matching this location... -->
<xsl:for-each select="key('data-by-location',location)">
<!--Create an element using the job_function
as the element name -->
<xsl:element name="{job_function}">
<!--The value of the count element
as the value of the generated element-->
<xsl:value-of select="count"/>
</xsl:element>
</xsl:for-each>
<TotalCount>
<!--calculate the sum of all the count element values
for this location -->
<xsl:value-of select="sum(key('data-by-location',
location)/count)"/>
</TotalCount>
</xsl:copy>
</xsl:for-each>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>