Compare the different line item fields and map the value which is in the same xml using xslt2.0 - xslt-2.0

Question

below one is the XML input,
<?xml version="1.0" encoding="utf-8"?>
<GSK_Canonical_MESGX2>
<header SEGMENT="1">
<orderNumber>002001454979</orderNumber>
<batchNumber>0000617944</batchNumber>
<BOM SEGMENT="1">
<operationNumber>0030</operationNumber>
<phaseIndicator>0011</phaseIndicator>
</BOM>
<BOM SEGMENT="1">
<operationNumber>0040</operationNumber>
<phaseIndicator>0012</phaseIndicator>
</BOM>
<recipe SEGMENT="1">
<phase>0011</phase>
<parentOperation>0030</parentOperation>
<workcenter>MANUOHD1</workcenter>
</recipe>
<recipe SEGMENT="1">
<phase>0012</phase>
<parentOperation>0040</parentOperation>
<workcenter>COSTOHD1</workcenter>
</recipe>
</header>
</GSK_Canonical_MESGX2>
I have an below xslt,
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:exsl="http://exslt.org/common" xmlns:set="http://exslt.org/sets" xmlns:str="http://exslt.org/strings" xmlns:java="http://xml.apache.org/xslt/java" xmlns:saxon="http://saxon.sf.net/" exclude-result-prefixes="exsl set str java saxon">
<xsl:output method="text"/>
<xsl:variable name="VarHash" select="'#'"/>
<xsl:variable name="VarBreak" select="'
'"/>
<xsl:variable name="pipeFieldDelimiter" select="'\|'"/>
<xsl:template match="/">
<xsl:text>HEADER</xsl:text>
<xsl:value-of select="$VarHash"/>
<xsl:value-of select="GSK_Canonical_MESGX2/header/orderNumber"/>
<xsl:value-of select="$VarHash"/>
<xsl:value-of select="GSK_Canonical_MESGX2/header/batchNumber"/>
<xsl:value-of select="$VarBreak"/>
<xsl:for-each select="GSK_Canonical_MESGX2/header/BOM">
<!--GSK_Canonical_MESGX2/Header/BOM/OperationNumber = GSK_Canonical_MESGX2/header/recipe/parentOperation and GSK_Canonical_MESGX2/Header/BOM/phaseIndicator = GSK_Canonical_MESGX2/header/recipe/phase then <xsl:value-of select="GSK_Canonical_MESGX2/header/recipe/workcenter"/> This needs to be implemented for each line item of BOM tag -->
<xsl:if test="position() != last()">
<xsl:value-of select="$VarBreak"/>
</xsl:if>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
below one is the expected output,
HEADER#002001454979#0000617944
MANUOHD1
COSTOHD1
now need to implement for each BOM line item,we need to compare BOM with Recipe tags and select workcenter value if the condition satisfied.
Header/BOM/OperationNumber = header/recipe/parentOperation
and
Header/BOM/phaseIndicator = header/recipe/phase
then
<xsl:value-of select="GSK_Canonical_MESGX2/header/recipe/workcenter"/>
Please help me to achieve this.Thanks

Answer 1

This transformation:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:key name="kBomByPhaseAndOperation" match="BOM"
use="concat(operationNumber, '|', phaseIndicator)"/>
<xsl:template match=
"recipe[key('kBomByPhaseAndOperation',
concat(parentOperation, '|', phase))
]">
<xsl:value-of select="concat('
', workcenter)"/>
</xsl:template>
<xsl:template match="header">
<xsl:text>HEADER</xsl:text>
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="orderNumber|batchNumber">
<xsl:value-of select="concat('#', .)"/>
</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>
When applied on the provided source XML document:
<GSK_Canonical_MESGX2>
<header SEGMENT="1">
<orderNumber>002001454979</orderNumber>
<batchNumber>0000617944</batchNumber>
<BOM SEGMENT="1">
<operationNumber>0030</operationNumber>
<phaseIndicator>0011</phaseIndicator>
</BOM>
<BOM SEGMENT="1">
<operationNumber>0040</operationNumber>
<phaseIndicator>0012</phaseIndicator>
</BOM>
<recipe SEGMENT="1">
<phase>0011</phase>
<parentOperation>0030</parentOperation>
<workcenter>MANUOHD1</workcenter>
</recipe>
<recipe SEGMENT="1">
<phase>0012</phase>
<parentOperation>0040</parentOperation>
<workcenter>COSTOHD1</workcenter>
</recipe>
</header>
</GSK_Canonical_MESGX2>
produces exactly the wanted, correct result:
HEADER#002001454979#0000617944
MANUOHD1
COSTOHD1