Thank you Martin! I need to unravel the select clause on the grouping; there
are some concepts I donbt understand.



From: Martin Honnen martin.honnen@xxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Friday, June 5, 2026 10:57 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  Algorithm for determining ranges





On 05/06/2026 16:47, rick@xxxxxxxxxxxxxx <mailto:rick@xxxxxxxxxxxxxx>  wrote:

Hi Martin,



The last number is where the ranges should be. Thank you.








I need to determine ranges, like this:



<?xml version="1.0" encoding="UTF-8"?>
<xrefs>
    <xref>16.1.0</xref>
    <xref>16.2.1</xref>
    <range/>
    <xref>16.2.3</xref>
    <xref>16.14.2</xref>
    <xref>16.22.0</xref>
</xrefs>



I am trying to determine an XSLT 3.0 algorithm for doing this. I am looking
for suggestions. Thank you in advance.





For the test sample

  <xsl:template match="xrefs">
    <xsl:copy>
      <xsl:for-each-group select="xref" group-adjacent="let $numbers :=
tokenize(., '\.') ! xs:integer(.) return string-join(($numbers[position() lt
last()], $numbers[last()] - position() + 1), '.')">
        <xsl:choose>
          <xsl:when test="current-group()[3]">
            <xsl:sequence select="current-group()[1]"/>
            <range/>
            <xsl:sequence select="current-group()[3]"/>
          </xsl:when>
          <xsl:otherwise>
            <xsl:sequence select="current-group()"/>
          </xsl:otherwise>
        </xsl:choose>
      </xsl:for-each-group>
    </xsl:copy>
  </xsl:template>

would do.

Not sure whether at some point e.g. 16.2.9 and 16.3.0 would form a range.

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