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[Bug 8222] XQuery11] Equivalence of two [atomic values in Group By, distinct-values()

From: <bugzilla@wiggum.w3.org>
Date: Wed, 13 Jan 2010 08:43:33 +0000
To: public-qt-comments@w3.org
Message-Id: <E1NUypB-0003VB-MM@wiggum.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=8222


Michael Kay <mike@saxonica.com> changed:

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--- Comment #1 from Michael Kay <mike@saxonica.com>  2010-01-13 08:43:33 ---
The simple answer is yes. But it's not quite as simple as that, because of
transitivity problems: see erratum E44

http://www.w3.org/XML/2007/qt-errata/xpath-functions-errata.html#E44

In fact distinct-values() provides rules for partitioning a set of atomic
values into groups that, except in edge cases, satisfy the principle that all
the values in a single group are equal, while the values found in one group are
not-equal to the values found in another group. xsl:for-each-group uses the
same rules (but not by reference), and XQuery 1.1 grouping should do likewise.


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Received on Wednesday, 13 January 2010 08:43:35 UTC

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