I would like to group based on fields of row element (combination of StackNumber,BlockNumber and LocationCode) and select only higher BookVersion (BookVersion) based rows in particular group(combination of StackNumber,BlockNumber and LocationCode) and also to select the rows of DeliveryMode with the value as TRANSIT.

Here is the input document

<?xml version="1.0"?>
<?xml version="1.0"?>
<Output>
<row>
<StackNumber>19</StackNumber>
<BlockNumber>61001</BlockNumber>
<DeliveryMode>TRANSIT</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>03</BookVersion>
<StoreNumber>1010</StoreNumber>

</row>
<row>
<StackNumber>20</StackNumber>
<BlockNumber>61001</BlockNumber>
<DeliveryMode>TRANSIT</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>01</BookVersion>
<StoreNumber>1011</StoreNumber>
</row>
<row>
<StackNumber>20</StackNumber>
<BlockNumber>61001</BlockNumber>
<DeliveryMode>TRANSIT</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>02</BookVersion>
<StoreNumber>1013</StoreNumber>
</row>
<row>
<StackNumber>21</StackNumber>
<BlockNumber>61001</BlockNumber>
<DeliveryMode>RECVD</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>03</BookVersion>
<StoreNumber>1022</StoreNumber>
</row>
<row>
<StackNumber>21</StackNumber>
<BlockNumber>61001</BlockNumber>
<DeliveryMode>TRANSIT</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>03</BookVersion>
<StoreNumber>1022</StoreNumber>
</row>
<row>
<StackNumber>22</StackNumber>
<BlockNumber>15098</BlockNumber>
<DeliveryMode>TRANSIT</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>01</BookVersion>
<StoreNumber>1010</StoreNumber>
</row>
<row>
<StackNumber>22</StackNumber>
<BlockNumber>22456</BlockNumber>
<DeliveryMode>TRANSIT</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>02</BookVersion>
<StoreNumber>1011</StoreNumber>
</row>
<row>
<StackNumber>22</StackNumber>
<BlockNumber>22456</BlockNumber>
<DeliveryMode>TRANSIT</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>03</BookVersion>
<StoreNumber>1012</StoreNumber>
</row>
<row>
<StackNumber>22</StackNumber>
<BlockNumber>22456</BlockNumber>
<DeliveryMode>RECVD</DeliveryMode>
<LocationCode>MON</LocationCode>
<BookVersion>02</BookVersion>
<StoreNumber>1021</StoreNumber>
</row>
</Output>

XSL (using saxon 9 parser) that I wrote:



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

<xsl:output method="xml" indent="yes"/>

<xsl:key name="transitGroup" match="row" use="concat(StackNumber,BlockNumber,LocationCode)"/>

<xsl:template match="/">
<Output>
<xsl:for-each select="//row[generate-id(.) = generate-id(key('transitGroup',concat(StackNumber,BlockNumb er,LocationCode))[1])]">
<xsl:variable name="BookVersion" select="key('transitGroup',concat(StackNumber,Bloc kNumber,LocationCode))/BookVersion"/>
<xsl:if test="DeliveryMode = 'TRANSIT'">
<row>
<StackNumber>
<xsl:value-of select="StackNumber"/>
</StackNumber>
<BlockNumber>
<xsl:value-of select="BlockNumber"/>
</BlockNumber>
<LocationCode>
<xsl:value-of select="LocationCode"/>
</LocationCode>
<StoreNumber>
<xsl:value-of select="StoreNumber"/>
</StoreNumber>

<xsl:for-each select="$BookVersion">

<xsl:sort select="." data-type="number" order="descending"/>

<xsl:if test="position()=1">
<BookVersion>
<xsl:value-of select="."/>
</BookVersion>
</xsl:if>
</xsl:for-each>
</row>
</xsl:if>
</xsl:for-each>
</Output>
</xsl:template>
</xsl:stylesheet>



I wrote one but can't figure out to select correct store number based on greater value based element 'BookVersion' in each group.


example group must be this .

<row>
<StackNumber>20</StackNumber>
<BlockNumber>61001</BlockNumber>
<LocationCode>MON</LocationCode>
<StoreNumber>1013</StoreNumber>
<BookVersion>02</BookVersion>
</row>

I'm getting wrong store number here for a particular selected group. I'm struck to proceed further here, I will appreciate if some body can lead me the way to write correct it in this XSL.

XSL V 1.0 based solution:

<?xml version="1.0" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" encoding="utf-8" />
<xsl:key name="transitGroup" match="row[DeliveryMode='TRANSIT']" use="concat(StackNumber,BlockNumber,LocationCode)"/>

<xsl:template match="/">
<xsl:apply-templates select="Output" />
</xsl:template>

<xsl:template match="Output">
<Output>
<xsl:apply-templates select="row[DeliveryMode='TRANSIT']" mode="special"/>
</Output>
</xsl:template>

<xsl:template match="row[DeliveryMode='TRANSIT']" mode="special">
<xsl:if test="generate-id(.)=generate-id(key('transitGroup', concat(StackNumber,BlockNumber,LocationCode))[1])">
<xsl:for-each select="key('transitGroup', concat(StackNumber,BlockNumber,LocationCode))">
<xsl:sort select="BookVersion" data-type="number" order="descending" />
<xsl:choose>
<xsl:when test="position() = 1">
<xsl:call-template name="display" />
</xsl:when>
<xsl:otherwise>
<!-- do nothing -->
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:if>
</xsl:template>

<xsl:template name="display">
<row>
<StackNumber>
<xsl:value-of select="StackNumber"/>
</StackNumber>
<BlockNumber>
<xsl:value-of select="BlockNumber"/>
</BlockNumber>
<LocationCode>
<xsl:value-of select="LocationCode"/>
</LocationCode>
<StoreNumber>
<xsl:value-of select="StoreNumber"/>
</StoreNumber>
<BookVersion>
<xsl:value-of select="BookVersion" />
</BookVersion>
</row>
</xsl:template>

</xsl:stylesheet>

2) Version 2.0 Based solution:

<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xsd"
version="2.0">

<xsl:output indent="yes"/>

<xsl:template match="/">
<Output>
<xsl:for-each-group select="*/row[DeliveryMode='TRANSIT']"
group-by="concat(StackNumber,'&#xd;',
BlockNumber,'&#xd;',LocationCode)">
<xsl:for-each select="current-group()
[xsd:decimal(BookVersion)=
max(current-group()/BookVersion/xsd:decimal(.))]
[1]">
<row>
<xsl:copy-of select="* except DeliveryMode"/>
</row>
</xsl:for-each>
</xsl:for-each-group>
</Output>
</xsl:template>

</xsl:stylesheet>