Need help on value comparison using XSLT - Compare 2 parent nodes-CodePudding

I have a XML which have two parent nodes (Base, Sub). I need to write a XSLT to get the values for below condition.

Condition: Need to get different elements in both parents.

Input XML:

<?xml version="1.0" encoding="UTF-8"?>
<Data>
  <Base>
    <Student_ID>1234</Student_ID>
    <Student_ID>1267</Student_ID>
    <Student_ID>1890</Student_ID>
    <Student_ID>5678</Student_ID>
    <Student_ID>6743</Student_ID>
    <Student_ID>8743</Student_ID>
  </Base>
  <Sub>
    <Student_ID>5678</Student_ID>
    <Student_ID>6743</Student_ID>
    <Student_ID>3226</Student_ID>
    <Student_ID>8123</Student_ID>
  </Sub>
</Data>

Expected Output:

<?xml version="1.0" encoding="UTF-8"?>
<Data>
    <Student_ID>1234</Student_ID>
    <Student_ID>1267</Student_ID>
    <Student_ID>1890</Student_ID>
    <Student_ID>8743</Student_ID>
    <Student_ID>3226</Student_ID>
    <Student_ID>8123</Student_ID>
</Data>

CodePudding user response：

Maybe something like this?

<xsl:stylesheet version="2.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>

<xsl:key name="student" match="Student_ID" use="." />

<xsl:template match="/Data">
    <xsl:copy>
        <xsl:copy-of select="Base/Student_ID[not(key('student', ., ../../Sub))]"/>
        <xsl:copy-of select="Sub/Student_ID[not(key('student', ., ../../Base))]"/>
    </xsl:copy>
</xsl:template>

</xsl:stylesheet>

CodePudding user response：

Another way you could look at it:

XSLT 2.0

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

<xsl:template match="/Data">
    <xsl:copy>
        <xsl:for-each-group select="*/Student_ID" group-by=".">
            <xsl:if test="count(current-group())=1">
                <xsl:copy-of select="."/>
            </xsl:if>
        </xsl:for-each-group>
    </xsl:copy>
</xsl:template>

</xsl:stylesheet>

Note that this assumes there are no duplicates within each branch.