One of the most basic changes in XSLT2+, if I remember correctly, was in 
reconciling node sets and temporary trees to be a single data type. If so, it 
might be a good idea to start with that before digging too deeply into other 
changes, to avoid risk of additional recording.

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________________________________
From: Mukul Gandhi (Jira) <j...@apache.org>
Sent: Monday, May 1, 2023 12:35:00 PM
To: dev@xalan.apache.org <dev@xalan.apache.org>
Subject: [jira] [Created] (XALANJ-2646) Implementation of xslt 3.0's 
xsl:for-each-group instruction, for XalanJ's interpretive processor

Mukul Gandhi created XALANJ-2646:
------------------------------------

             Summary: Implementation of xslt 3.0's xsl:for-each-group 
instruction, for XalanJ's interpretive processor
                 Key: XALANJ-2646
                 URL: https://issues.apache.org/jira/browse/XALANJ-2646
             Project: XalanJ2
          Issue Type: New Feature
      Security Level: No security risk; visible to anyone (Ordinary problems in 
Xalan projects.  Anybody can view the issue.)
            Reporter: Mukul Gandhi
            Assignee: Gary D. Gregory


I'm creating this jira issue, to track implementation of XSLT 3.0's 
xsl:for-each-group instruction, for XalanJ's interpretive processor.

I've done little bit of implementation for this, that seems to work fine for 
various primary XSLT 3.0 xsl:for-each-group use cases. The XSLT 3.0 structural 
implementation for xsl:for-each-group, implementing the XSLT element 
xsl:for-each-group, and functions fn:current-group(), fn:current-grouping-key() 
have been completed.

The codebase changes for above mentioned implementation aspects, have been 
committed to xalan-java repo's branch xalan-j_xslt3.0.



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