How do I get the expected output in XSLT below

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I have the following xml -

<Element>
	<Token>Token1</Token>
     <Values>1,2</Values>
</Element>
<Element>
	<Token>Token2</Token>
     <Values>4,5</Values>
</Element>
<Element>
	<Token>Token1</Token>
     <Values>7,8</Values>
</Element>

And using xslt, I want to get a node <values> like this -
<values>1,2;7,8|4,5

<Element>
	<Token>Token1</Token>
     <Values>1,2</Values>
</Element>
<Element>
	<Token>Token2</Token>
     <Values>4,5</Values>
</Element>
<Element>
	<Token>Token3</Token>
     <Values>7,8</Values>
</Element>

Expected output -

<Values>1,2|7,8|4,5</Values>

Essentially if distinct token nodes, then use delimiter | to get <values> node otherwise if same token node attributes (like the example) then merge and use ; delimiter. How do we achieve this using XSLT 1.0?

What I have tried:

Not sure how to start, I tried this but didn't work -

<xsl:for-each select="//Element/Token[not(.=preceding::*)]">

       <xsl:value-of select="//Element/Values"/>
           <xsl:if test="not(position()=last())">|</xsl:if>


            </xsl:for-each>

Posted 9-Dec-23 13:29pm

diadtp

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Bassam Abdul-Baki · Answer 1 · 2023-12-10T08:11:00

Solution 2

That's a different homework problem.

You'll have to rewrite it to parse by the same values.

Posted 10-Dec-23 8:11am

Bassam Abdul-Baki

Bassam Abdul-Baki · Answer 2 · 2023-12-09T17:26:00

Can't use xsl:sort as is. See https://stackoverflow.com/questions/42806139/using-preceding-sibling-with-with-xslsort[^].

Your best bet is to sort it to another XML node-set and then parse it.

The following works somewhat.

This adds an extra | at the end. Also added Elements as a root element for the XML.

XML

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:output method="html" indent="yes" />

	<xsl:key name="Token" match="Element" use="Token" />

	<xsl:template match="Elements">
		<xsl:apply-templates select="Element[generate-id(.)=generate-id(key('Token',Token)[1])]"/>
	</xsl:template>

	<xsl:template match="Element">
		<xsl:for-each select="key('Token', Token)">
			<xsl:sort select="Token"/>
			<xsl:value-of select="Values"/>
			<xsl:variable name="var1">
				<xsl:value-of select="Token"/>
			</xsl:variable>
			<xsl:variable name="var2">
				<xsl:value-of select="following::Token"/>
			</xsl:variable>
			<xsl:choose>
				<xsl:when test="not($var2='')">
					<xsl:choose>
						<xsl:when test="not(position()=last())">;</xsl:when>
						<xsl:otherwise>|</xsl:otherwise>
					</xsl:choose>
				</xsl:when>
				<xsl:otherwise>|</xsl:otherwise>
			</xsl:choose>
		</xsl:for-each>
	</xsl:template>

</xsl:stylesheet>