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https://issues.apache.org/jira/browse/XALANJ-2646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17720216#comment-17720216
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Mukul Gandhi commented on XALANJ-2646:
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The section "14.3 Ordering among Groups" (part of section "14 Grouping") of the
XSLT 3.0 spec says following,
<quote>
Definition: There is a total ordering among groups referred to as the order of
first appearance. A group G is defined to precede a group H in order of first
appearance if the initial item of G precedes the initial item of H in
population order.
Definition: There is another total ordering among groups referred to as
processing order. If group R precedes group S in processing order, then in the
result sequence returned by the xsl:for-each-group instruction the items
generated by processing group R will precede the items generated by processing
group S.
</quote>
This implementation of xsl:for-each-group, that has been committed, implements
the second version (as mentioned above) of definition of "total ordering among
groups", i.e the "processing order".
> 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.)
> Components: Xalan-interpretive
> Reporter: Mukul Gandhi
> Assignee: Mukul Gandhi
> Priority: Major
> Attachments: xsl3_for_each_group_test_files.zip
>
>
> 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. xsl:for-each-group's
> attributes "group-by" and "group-adjacent" have been implemented. Currently,
> xsl:for-each-group's grouping keys (i.e, value of xslt 3.0 function
> fn:current-grouping-key()) can have values typed as string, number and
> boolean (any other XPath data type for xslt 3.0's grouping keys is converted
> to a string value).
> 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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