[xsl] Help me to select group based on maximum value

Hi ,

I want to use XSL 2.0 to transform very big file of size 20 MB XML
data to filter some of the elements. I downsized that input and pasted
here.  I want to select only one node based on highest number in it's
element 'rank'  from multiple product elements by grouping it's
attribute 'id'. Output should look like shown below.

My XSL is selecting all productids and  can't get the logic to group
by id. I will appreciate if you can help me doing group by id
attribute in this XSL.

Here is my input XML :

<?xml version="1.0"?>
<Products groupid="14567-567">
    <Manager id="8789"/>
    <Product id="998">
        <rank>1</rank>
        <LocationID>676</LocationID>
        <CompanyID>A58</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <Product id="998">
        <rank>2</rank>
        <LocationID>897</LocationID>
        <CompanyID>A56</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <Product id="998">
        <rank>3</rank>
        <LocationID>556</LocationID>
        <CompanyID>A51</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <Product id="998">
        <rank>4</rank>
        <LocationID>544</LocationID>
        <CompanyID>A50</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <Product id="754">
        <rank>1</rank>
        <LocationID>672</LocationID>
        <CompanyID>A58</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <Product id="754">
        <rank>2</rank>
        <LocationID>891</LocationID>
        <CompanyID>A56</CompanyID>
        <QAcheckID>Q350</QAcheckID>
    </Product>
    <Product id="442">
        <rank>3</rank>
        <LocationID>556</LocationID>
        <CompanyID>A51</CompanyID>
        <QAcheckID>Q350</QAcheckID>
    </Product>
    <Product id="998">
        <rank>5</rank>
        <LocationID>544</LocationID>
        <CompanyID>A50</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <ratingrank>A1</ratingrank>
    <salesratio>.82</salesratio>
</Products>


output:

<?xml version="1.0"?>
<Products groupid="14567-567">
    <Manager id="8789"/>
    <Product id="998">
        <rank>4</rank>
        <LocationID>544</LocationID>
        <CompanyID>A50</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <Product id="754">
        <rank>2</rank>
        <LocationID>891</LocationID>
        <CompanyID>A56</CompanyID>
        <QAcheckID>Q350</QAcheckID>
    </Product>
    <Product id="442">
        <rank>3</rank>
        <LocationID>556</LocationID>
        <CompanyID>A51</CompanyID>
        <QAcheckID>Q350</QAcheckID>
    </Product>
    <Product id="998">
        <rank>5</rank>
        <LocationID>544</LocationID>
        <CompanyID>A50</CompanyID>
        <QAcheckID>Q349</QAcheckID>
    </Product>
    <ratingrank>A1</ratingrank>
    <salesratio>.82</salesratio>
</Products>


my XSL:


<xsl:stylesheet version="2.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
 xmlns:xs="http://www.w3.org/2001/XMLSchema";
 xmlns:my="my:my">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:template match="node()|@*">
  <xsl:copy>
   <xsl:apply-templates select="node()|@*"/>
  </xsl:copy>
 </xsl:template>

 <xsl:template match=
 "Product [@id]
   [not(rank eq my:max(../Product/rank))
   or
    rank = preceding-sibling::Product /rank
   ]"/>

 <xsl:function name="my:max" as="xs:string">
   <xsl:param name="pValues" as="xs:string+"/>

   <xsl:sequence select=
    "if(not(distinct-values($pValues)[2]))
       then $pValues[1]
     else
      for $vMax1 in
             max(for $s in $pValues
                  return
                    xs:integer(substring-before(concat($s,'.'),'.'))
                 ),

          $vcntMax1Values in
             count($pValues[starts-with(., string($vMax1))])

        return
          if($vcntMax1Values eq 1)
            then $pValues[starts-with(., string($vMax1))]
                          [1]
            else
             for $submax in
                     (my:max(for $val in
                                    $pValues[starts-with(., string($vMax1))]
                                                [contains(., '.')],
                                    $subval in substring-after($val, '.')
                                return
                                    $subval
                             )
                      )
                 return
                   concat($vMax1, '.', $submax)

    "/>
 </xsl:function>
</xsl:stylesheet>

- Sunny

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