I am using XSLT 1.0 I have the following xml document
<ns0:Root xmlns:ns0="http://schemas.microsoft.com/BizTalk/2003/aggschema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<InputMessagePart_0>
<ns1:ArrayOfArticleMasterDTO xmlns:ns1="http://BTS.GO.FactFeeds/DC_ArticleMaster">
<ArticleMasterDTO>
<AltBarcodes>
<string>5020436473709</string>
</AltBarcodes>
<ClientId>GO01</ClientId>
<ArticleID>100000005503</ArticleID>
<ArticleReference>CORE_OWBA_WW873R</ArticleReference>
<ArticleSize>14</ArticleSize>
<ArticleStyle>26600</ArticleStyle>
<ArticleFit>-</ArticleFit>
<SupplierID>50102</SupplierID>
<Description>AMELIE OTRS [REG]</Description>
<Sku>COREOWBAWW873RBLAC-14</Sku>
<UnitsPerCase>1</UnitsPerCase>
<UnitsPerLayer xsi:nil="true" />
<UnitsPerPallet xsi:nil="true" />
<LayersPerPallet xsi:nil="true" />
<FullPalletWeightKG xsi:nil="true" />
<CaseLengthMM xsi:nil="true" />
<CaseHeightMM xsi:nil="true" />
<CaseDepthMM xsi:nil="true" />
<CaseWeightG xsi:nil="true" />
<Colour>BLAC</Colour>
<Level1Description>CLOTHING</Level1Description>
<Level2Description>WOMENS</Level2Description>
<Level3Description>WP LEGWEAR</Level3Description>
<Level4Description>LEG COATED</Level4Description>
<PrimaryBarcode>5051513724896</PrimaryBarcode>
</ArticleMasterDTO>
<ArticleMasterDTO>
<AltBarcodes>
<string>5027793433728</string>
</AltBarcodes>
<ClientId>GO01</ClientId>
<ArticleID>100000032177</ArticleID>
<ArticleReference>CORE_OMOE_47354</ArticleReference>
<ArticleSize>L-XL</ArticleSize>
<ArticleStyle>24608</ArticleStyle>
<ArticleFit>-</ArticleFit>
<SupplierID>50013</SupplierID>
<Description>POWER STRETCH GLOVE</Description>
<Sku>COREOMOE47354BLAC-L-XL</Sku>
<UnitsPerCase>6</UnitsPerCase>
<UnitsPerLayer xsi:nil="true" />
<UnitsPerPallet xsi:nil="true" />
<LayersPerPallet xsi:nil="true" />
<FullPalletWeightKG xsi:nil="true" />
<CaseLengthMM xsi:nil="true" />
<CaseHeightMM xsi:nil="true" />
<CaseDepthMM xsi:nil="true" />
<CaseWeightG xsi:nil="true" />
<Colour>BLAC</Colour>
<Level1Description>CLOTHING</Level1Description>
<Level2Description>MENS</Level2Description>
<Level3Description>GLOVES</Level3Description>
<Level4Description>FLEECE GLOVE</Level4Description>
<PrimaryBarcode>5052071278609</PrimaryBarcode>
</ArticleMasterDTO>
</ns1:ArrayOfArticleMasterDTO>
</InputMessagePart_0>
<InputMessagePart_1>
<ns2:SelectResponse xmlns:ns2="http://Microsoft.LobServices.OracleDB/2007/03/USER_DWDEV/Table/DW_PACK_BARCODES">
<ns2:SelectResult>
<ns2:DW_PACK_BARCODESRECORDSELECT>
<ns2:PRODUCT_ID>100000005503</ns2:PRODUCT_ID>
<ns2:SYS_BARCODE>SYS_BARCODES</ns2:SYS_BARCODE>
<ns2:PACK_TYPE>PACK_T</ns2:PACK_TYPE>
<ns2:CHECK_DIGIT_PACK_BARCODE>PackBarcode5503</ns2:CHECK_DIGIT_PACK_BARCODE>
<ns2:PACK_BARCODE>PACK_BARCODEP</ns2:PACK_BARCODE>
<ns2:CHECK_DIGIT_CARTON_BARCODE>CHECK_DIGIT_CA</ns2:CHECK_DIGIT_CARTON_BARCODE>
<ns2:CARTON_BARCODE>CARTON_BARCOD</ns2:CARTON_BARCODE>
<ns2:IN_DATE>1999-05-31T13:20:00.000-05:00</ns2:IN_DATE>
<ns2:UP_DATE>1999-05-31T13:20:00.000-05:00</ns2:UP_DATE>
<ns2:CREATEDTIME>1999-05-31T13:20:00.000-05:00</ns2:CREATEDTIME>
</ns2:DW_PACK_BARCODESRECORDSELECT>
<ns2:DW_PACK_BARCODESRECORDSELECT>
<ns2:PRODUCT_ID>100000032177</ns2:PRODUCT_ID>
<ns2:SYS_BARCODE>SYS_BARCODES</ns2:SYS_BARCODE>
<ns2:PACK_TYPE>PACK_T</ns2:PACK_TYPE>
<ns2:CHECK_DIGIT_PACK_BARCODE>PackBarcode32177</ns2:CHECK_DIGIT_PACK_BARCODE>
<ns2:PACK_BARCODE>PACK_BARCODEP</ns2:PACK_BARCODE>
<ns2:CHECK_DIGIT_CARTON_BARCODE>CHECK_DIGIT_CA</ns2:CHECK_DIGIT_CARTON_BARCODE>
<ns2:CARTON_BARCODE>CARTON_BARCOD</ns2:CARTON_BARCODE>
<ns2:IN_DATE>1999-05-31T13:20:00.000-05:00</ns2:IN_DATE>
<ns2:UP_DATE>1999-05-31T13:20:00.000-05:00</ns2:UP_DATE>
<ns2:CREATEDTIME>1999-05-31T13:20:00.000-05:00</ns2:CREATEDTIME>
</ns2:DW_PACK_BARCODESRECORDSELECT>
</ns2:SelectResult>
</ns2:SelectResponse>
</InputMessagePart_1>
</ns0:Root>
I'd like to select the value of the CHECK_DIGIT_PACK_BARCODE element that is a sibling of a given PRODUCT_ID
Following Tim's suggestion, here's my XSLT which attempts to provide a value for OuterCartonBarcode by keying from the CHECK_DIGIT_PACK_BARCODE of the ns2:SelectResponse
<?xml version="1.0" encoding="utf-16"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" xmlns:var="http://schemas.microsoft.com/BizTalk/2003/var" exclude-result-prefixes="msxsl var ns2 s1" version="1.0" xmlns:ns1="http://BTS.GO.FactFeeds/DC_ArticleMaster" xmlns:s1="http://schemas.microsoft.com/BizTalk/2003/aggschema" xmlns:ns2="http://Microsoft.LobServices.OracleDB/2007/03/USER_DWDEV/Table/DW_PACK_BARCODES" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsl:key name="barcodes" match="ns2:DW_PACK_BARCODESRECORDSELECT" use="ns2:PRODUCT_ID" />
<xsl:output omit-xml-declaration="yes" method="xml" version="1.0" />
<xsl:template match="/">
<xsl:apply-templates select="/s1:Root" />
</xsl:template>
<xsl:template match="/s1:Root">
<ns1:ArrayOfArticleMasterDTO>
<xsl:for-each select="InputMessagePart_0/ns1:ArrayOfArticleMasterDTO/ArticleMasterDTO">
<ArticleMasterDTO>
<AltBarcodes>
<string>
<xsl:value-of select="AltBarcodes/string/text()" />
</string>
<xsl:value-of select="AltBarcodes/text()" />
</AltBarcodes>
<ClientId>
<xsl:value-of select="ClientId/text()" />
</ClientId>
<ArticleID>
<xsl:value-of select="ArticleID/text()" />
</ArticleID>
<ArticleReference>
<xsl:value-of select="ArticleReference/text()" />
</ArticleReference>
<ArticleSize>
<xsl:value-of select="ArticleSize/text()" />
</ArticleSize>
<ArticleStyle>
<xsl:value-of select="ArticleStyle/text()" />
</ArticleStyle>
<ArticleFit>
<xsl:value-of select="ArticleFit/text()" />
</ArticleFit>
<SupplierID>
<xsl:value-of select="SupplierID/text()" />
</SupplierID>
<Description>
<xsl:value-of select="Description/text()" />
</Description>
<Sku>
<xsl:value-of select="Sku/text()" />
</Sku>
<UnitsPerCase>
<xsl:value-of select="UnitsPerCase/text()" />
</UnitsPerCase>
<UnitsPerLayer>
<xsl:value-of select="UnitsPerLayer/text()" />
</UnitsPerLayer>
<xsl:variable name="var:v1" select="string(UnitsPerPallet/@xsi:nil) = 'true'" />
<xsl:if test="string($var:v1)='true'">
<UnitsPerPallet>
<xsl:attribute name="xsi:nil">
<xsl:value-of select="'true'" />
</xsl:attribute>
</UnitsPerPallet>
</xsl:if>
<xsl:if test="string($var:v1)='false'">
<UnitsPerPallet>
<xsl:value-of select="UnitsPerPallet/text()" />
</UnitsPerPallet>
</xsl:if>
<xsl:variable name="var:v2" select="string(LayersPerPallet/@xsi:nil) = 'true'" />
<xsl:if test="string($var:v2)='true'">
<LayersPerPallet>
<xsl:attribute name="xsi:nil">
<xsl:value-of select="'true'" />
</xsl:attribute>
</LayersPerPallet>
</xsl:if>
<xsl:if test="string($var:v2)='false'">
<LayersPerPallet>
<xsl:value-of select="LayersPerPallet/text()" />
</LayersPerPallet>
</xsl:if>
<xsl:variable name="var:v3" select="string(FullPalletWeightKG/@xsi:nil) = 'true'" />
<xsl:if test="string($var:v3)='true'">
<FullPalletWeightKG>
<xsl:attribute name="xsi:nil">
<xsl:value-of select="'true'" />
</xsl:attribute>
</FullPalletWeightKG>
</xsl:if>
<xsl:if test="string($var:v3)='false'">
<FullPalletWeightKG>
<xsl:value-of select="FullPalletWeightKG/text()" />
</FullPalletWeightKG>
</xsl:if>
<xsl:variable name="var:v4" select="string(CaseLengthMM/@xsi:nil) = 'true'" />
<xsl:if test="string($var:v4)='true'">
<CaseLengthMM>
<xsl:attribute name="xsi:nil">
<xsl:value-of select="'true'" />
</xsl:attribute>
</CaseLengthMM>
</xsl:if>
<xsl:if test="string($var:v4)='false'">
<CaseLengthMM>
<xsl:value-of select="CaseLengthMM/text()" />
</CaseLengthMM>
</xsl:if>
<xsl:variable name="var:v5" select="string(CaseHeightMM/@xsi:nil) = 'true'" />
<xsl:if test="string($var:v5)='true'">
<CaseHeightMM>
<xsl:attribute name="xsi:nil">
<xsl:value-of select="'true'" />
</xsl:attribute>
</CaseHeightMM>
</xsl:if>
<xsl:if test="string($var:v5)='false'">
<CaseHeightMM>
<xsl:value-of select="CaseHeightMM/text()" />
</CaseHeightMM>
</xsl:if>
<CaseDepthMM>
<xsl:value-of select="CaseDepthMM/text()" />
</CaseDepthMM>
<CaseWeightG>
<xsl:value-of select="CaseWeightG/text()" />
</CaseWeightG>
<Colour>
<xsl:value-of select="Colour/text()" />
</Colour>
<Level1Description>
<xsl:value-of select="Level1Description/text()" />
</Level1Description>
<Level2Description>
<xsl:value-of select="Level2Description/text()" />
</Level2Description>
<Level3Description>
<xsl:value-of select="Level3Description/text()" />
</Level3Description>
<Level4Description>
<xsl:value-of select="Level4Description/text()" />
</Level4Description>
<xsl:call-template name="PBTemplate">
<xsl:with-param name="id" select="string(ArticleID/text())" />
</xsl:call-template>
<xsl:variable name="var:v6" select="string(PrimaryBarcode/@xsi:nil) = 'true'" />
<xsl:if test="string($var:v6)='true'">
<PrimaryBarcode>
<xsl:attribute name="xsi:nil">
<xsl:value-of select="'true'" />
</xsl:attribute>
</PrimaryBarcode>
</xsl:if>
<xsl:if test="string($var:v6)='false'">
<PrimaryBarcode>
<xsl:value-of select="PrimaryBarcode/text()" />
</PrimaryBarcode>
</xsl:if>
</ArticleMasterDTO>
</xsl:for-each>
</ns1:ArrayOfArticleMasterDTO>
</xsl:template>
<xsl:template name="PBTemplate">
<xsl:param name="id" select="ArticleID" />
<xsl:for-each select="key('barcodes',$id)">
<OuterCartonBarcode>
<xsl:value-of select="/ns2:CHECK_DIGIT_PACK_BARCODE"/>
</OuterCartonBarcode>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
Your current xpath ends with this...
/*[local-name() = 'CHECK_DIGIT_PACK_BARCODE'[PRODUCT_ID/text()="100000005503"]]
... which does not look correct.
The expression you are looking for is this....
/ns0:Root/InputMessagePart_1/*[local-name() = 'SelectResponse']/*[local-name() = 'SelectResult']/*[*[local-name()= 'PRODUCT_ID']/text()='100000005503']/*[local-name() = 'CHECK_DIGIT_PACK_BARCODE']
Or, to make it a bit more readable, this....
/ns0:Root
/InputMessagePart_1
/*[local-name() = 'SelectResponse']
/*[local-name() = 'SelectResult']
/*[*[local-name()= 'PRODUCT_ID']/text()='100000005503']
/*[local-name() = 'CHECK_DIGIT_PACK_BARCODE']
It would be much better if the expression did not try to ignore the namespaces, but used the relevant prefixes (as happens already with ns0:Root). Then the expression is much simplified
/ns0:Root/InputMessagePart_1/ns2:SelectResponse/ns2:SelectResult/*[ns2:PRODUCT_ID='100000005503']/ns2:CHECK_DIGIT_PACK_BARCODE
Or better still, define a key like so:
<xsl:key name="barcodes" match="ns2:DW_PACK_BARCODESRECORDSELECT" use="ns2:PRODUCT_ID" />
Then you can write just this...
key('barcodes', '100000005503')/ns2:CHECK_DIGIT_PACK_BARCODE