This will do what you want:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet exclude-result-prefixes="xs math xd" version="2.0"
xmlns:math="http://www.w3.org/2005/xpath-functions/math"
B B B  xmlns:xd="http://www.oxygenxml.com/ns/doc/xsl"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
B B B  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

B B B  <!-- make a variable that has the gen-id of only the first occurance of
the xreflabel contents -->
B B B  <xsl:variable name="affiliations">
B B B B B B B  <xsl:for-each-group group-by="@xreflabel"
select="/authorgroup/author/affiliation">
B B B B B B B B B B B  <!-- take only the first one in the group -->
B B B B B B B B B B B  <xsl:copy-of
select="current-group()[1]/generate-id(.)"/>
B B B B B B B  </xsl:for-each-group>
B B B  </xsl:variable>

B B B  <!-- start at root -->
B B B  <xsl:template match="/authorgroup">
B B B B B B B  <aug>
B B B B B B B B B B B  <!--<xsl:apply-templates mode="a1"/>-->
B B B B B B B B B B B B  <xsl:apply-templates mode="a2"/>
B B B B B B B  </aug>
B B B  </xsl:template>

B B B  <!-- match each author -->
B B B  <xsl:template match="author" mode="a1">
B B B B B B B  <au>
B B B B B B B B B B B  <xsl:value-of select="name"/>
B B B B B B B  </au>
B B B  </xsl:template>

B B B  <!-- drop name on the a2 pass -->
B B B  <xsl:template match="author/name" mode="a2"/>

B B B  <!-- process affiliation elelemts -->
B B B  <xsl:template match="author/affiliation" mode="a2">
B B B B B B B  <!-- debug info -->
B B B B B B B  <!--<gen-id>
B B B B B B B B B B B  <xsl:value-of select="generate-id(.)"/>
B B B B B B B  </gen-id>-->
B B B B B B B  <xsl:if test="./generate-id(.) = tokenize($affiliations, '
')">
B B B B B B B B B B B  <aff>
B B B B B B B B B B B B B B B  <xsl:copy-of select="org | sub | sup"/>
B B B B B B B B B B B B B B B  <xsl:value-of select="./text()"/>
B B B B B B B B B B B  </aff>
B B B B B B B  </xsl:if>
B B B  </xsl:template>

B B B  <!-- drop all -->
B B B  <xsl:template match="* | text() | @* | comment()"/>
</xsl:stylesheet>


Terry Badger






On Wednesday, December 20, 2023 at 05:02:15 AM EST, Joga Singh Rawat
jrawat@xxxxxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:





Hi Friends,
We need to remove duplicate affiliation that can be unique by @xreflabel.
Could you please let me know any clue.

Input
<authorgroup>
<author>
<name>a</name>
<affiliation xreflabel=b1b><org>..</org> First affiliation</affiliation>
<affiliation xreflabel=b2b><sup>..</sup> Second affiliation</affiliation>
</author>
<author>
<name>b</name>
<affiliation xreflabel=b1b><org>..</org> First affiliation</affiliation>
</author>
<author>
<name>c</name>
<affiliation xreflabel=b3b><org>..</org> Third affiliation</affiliation>
</author>
<author>
<name>d</name>
<affiliation xreflabel=b1b><org>..</org> First affiliation</affiliation>
<affiliation xreflabel=b4b><sub>..</sub> Forth affiliation</affiliation>
</author>
B 
Output
<aug>
<au>a</au>
<au>b</au>
<au>c</au>
<au>d</au>
<aff><org>b&</org> First affiliation</aff>
<aff><sup>b&</sup> Second affiliation</aff>
<aff><org>b&</org> Third affiliation</aff>
<aff><sub>b&</sub> Forth affiliation</aff>
B 


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