XSLT: How to represent OR in key match - xslt

Question

I have the input XML as
<document>
<item>
<gtin>4341</gtin>
<functionalName lang="en">Filte</functionalName>
<functionalName lang="en">test1</functionalName>
<functionalName lang="chi">Filters2</functionalName>
<functionalName lang="hin">Filters3</functionalName>
<gtinName lang="en">gtinName1</gtinName>
<gtinName lang="en">gtinName2</gtinName>
<gtinName lang="hin">gtinName3</gtinName>
</item>
<item>
<gtin>4342</gtin>
<functionalName lang="en">Filte</functionalName>
<functionalName lang="chi">Filters</functionalName>
<functionalName lang="en">Filters1</functionalName>
<gtinName lang="en">gtinName1</gtinName>
<gtinName lang="chi">gtinName2</gtinName>
<gtinName lang="chi">gtinName3</gtinName>
</item>
</document>
I want to loop through each language and get the count with respect to group by of language
Expected output XML should be
<?xml version="1.0" encoding="UTF-8"?>
<CatalogItem>
<RelationshipData>
<Relationship>
<RelationType>Descriptions_for_Item</RelationType>
<RelatedItems count="3">
<RelatedItem1 referenceKey="ITEM_DESCRIPTION-4341-en" />
<RelatedItem1 referenceKey="ITEM_DESCRIPTION-4341-chi" />
<RelatedItem1 referenceKey="ITEM_DESCRIPTION-4341-hin" />
</RelatedItems>
</Relationship>
</RelationshipData>
<RelationshipData>
<Relationship>
<RelationType>Descriptions_for_Item</RelationType>
<RelatedItems count="2">
<RelatedItem1 referenceKey="ITEM_DESCRIPTION-4342-en" />
<RelatedItem1 referenceKey="ITEM_DESCRIPTION-4342-chi" />
</RelatedItems>
</Relationship>
</RelationshipData>
</CatalogItem>
Sample XSLT which is used by me but its not giving me expected Output
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:key name="functional" match="gtinName" use="concat(generate-id(..), '|', #lang)" />
<xsl:template match="document">
<CatalogItem>
<xsl:for-each select="item">
<RelationshipData>
<Relationship>
<RelationType>Descriptions_for_Item</RelationType>
<RelatedItems count="{count(gtinName[generate-id() = generate-id(key('functional', concat(generate-id(..), '|', #lang))[1])])}">
<xsl:apply-templates select="gtinName[generate-id() = generate-id(key('functional', concat(generate-id(..), '|', #lang))[1])]"/>
</RelatedItems>
</Relationship>
</RelationshipData>
</xsl:for-each>
</CatalogItem>
</xsl:template>
<xsl:template match="gtinName|functionalName">
<RelatedItem1 referenceKey="{concat('ITEM_DESCRIPTION','-',ancestor::item/gtin,'- ',#lang)}"/>
</xsl:template>
</xsl:stylesheet>

Answer 1

If you want the count of language attributes on either "functionName" or "gtimName" then change your key to this
<xsl:key name="functional" match="gtinName|functionalName" use="concat(generate-id(..), '|', #lang)" />
Then, to get the count of the languages, do this
count((functionalName|gtinName)[generate-id() = generate-id(key('functional', concat(generate-id(..), '|', #lang))[1])])}">
Try this XSLT
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:key name="functional" match="gtinName|functionalName" use="concat(generate-id(..), '|', #lang)" />
<xsl:template match="document">
<CatalogItem>
<xsl:for-each select="item">
<RelationshipData>
<Relationship>
<RelationType>Descriptions_for_Item</RelationType>
<xsl:variable name="lang" select="(functionalName|gtinName)[generate-id() = generate-id(key('functional', concat(generate-id(..), '|', #lang))[1])]" />
<RelatedItems count="{count($lang)}">
<xsl:apply-templates select="$lang"/>
</RelatedItems>
</Relationship>
</RelationshipData>
</xsl:for-each>
</CatalogItem>
</xsl:template>
<xsl:template match="gtinName|functionalName">
<RelatedItem1 referenceKey="{concat('ITEM_DESCRIPTION','-',ancestor::item/gtin,'- ',#lang)}"/>
</xsl:template>
</xsl:stylesheet>
As an alternative, if only "gtinName" and "functionalName" have a "lang" attribute, you could use the syntax *[#lang] instead....
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:key name="functional" match="*[#lang]" use="concat(generate-id(..), '|', #lang)" />
<xsl:template match="document">
<CatalogItem>
<xsl:for-each select="item">
<RelationshipData>
<Relationship>
<RelationType>Descriptions_for_Item</RelationType>
<xsl:variable name="lang" select="*[#lang][generate-id() = generate-id(key('functional', concat(generate-id(..), '|', #lang))[1])]" />
<RelatedItems count="{count($lang)}">
<xsl:apply-templates select="$lang"/>
</RelatedItems>
</Relationship>
</RelationshipData>
</xsl:for-each>
</CatalogItem>
</xsl:template>
<xsl:template match="*[#lang]">
<RelatedItem1 referenceKey="{concat('ITEM_DESCRIPTION','-',ancestor::item/gtin,'- ',#lang)}"/>
</xsl:template>
</xsl:stylesheet>