Re: XSLT Comparison of Two Trees

I wish to compare two (xml tree) documents, a previous document and it's
current version. The previous tree looks like this: (the current tree
appears below this previous tree, the xsl - below that.)
If I could
A. Create a report of zip codes that were added
B. Create a report of zip codes that were deleted
C. Create a report of zip codes that were moved
D. Find the percentage difference of the <Total>####</Total>
information, using this algorithm: (currentTotal -
previousTotal)/previousTotal

<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="2.0">

  <xsl:param name="pv" select="'previous.xml'"/>
  <xsl:variable name="pdoc" select="document($pv)"/>
  <xsl:variable name="cdoc" select="/"/>
  <xsl:output indent="yes"/>

<new-codes>
   <city name="All areas"/>
   <city name="Total, California"/>
   <city name="Alhambra">
      <zip zipCode="11111"><!-- This zip code was added to Alhambra -->
   <Total>1000</Total>
      </zip>
   </city>
   <city name="American River"/>
   <city name="Anaheim"/>
   <city name="Antioch">
      <zip zipCode="22222"><!-- This zip code was added to Antioch -->
   <Total>5790</Total>
      </zip>
   </city>
   <city name="Auburn">
      <zip zipCode="33333"><!-- This zip code was added to Auburn -->
   <Total>5790</Total>
      </zip>
   </city>
   <city name="Bakersfield"/>
   <city name="Bakersfield, East Hills"/>
</new-codes>
<moved-codes>
   <city name="All areas"/>
   <city name="Total, California"/>
   <city name="Alhambra"/>
   <city name="American River"/>
   <city name="Anaheim">
      <zip zipCode="95610"><!-- zip code was moved from American River to
Anaheim -->
   <Total>5750</Total>
      </zip>
   </city>
   <city name="Antioch"/>
   <city name="Auburn">
      <zip zipCode="95628"><!-- This zip code was moved from American River
to Auburn -->
   <Total>7325</Total>
      </zip>
   </city>
   <city name="Bakersfield"/>
   <city name="Bakersfield, East Hills"/>
</moved-codes>
<deleted-codes>
   <city name="All areas"/>
   <city name="Total, California"/>
   <city name="Alhambra"/>
   <city name="American River">
      <zip zipCode="95621">
         <Total>7135</Total>
      </zip>
   </city>
   <city name="Anaheim"/>
   <city name="Antioch">
      <zip zipCode="94505">
         <Total>1575</Total>
      </zip>
   </city>
   <city name="Auburn"/>
   <city name="Bakersfield"/>
   <city name="Bakersfield, East Hills"/>
</deleted-codes>

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/