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[Bug 2794] [Update] mixing pending update lists with values

From: <bugzilla@wiggum.w3.org>
Date: Sun, 06 Aug 2006 08:59:40 +0000
To: public-qt-comments@w3.org
Message-Id: <E1G9eU0-0004Tn-Jo@wiggum.w3.org>


martin@x-hive.com changed:

           What    |Removed                     |Added
                 CC|                            |martin@x-hive.com

------- Comment #1 from martin@x-hive.com  2006-08-06 08:59 -------
Is there any way to weigh in on this issue? If I'm not misreading it, the
current spec as of 2006-07-11 disallows expressions to return both values and
pending update lists (by disallowing expressions that have updating and
non-updating children).

I'm not entirely sure about that, as the wording is pretty strange:
1. If any branch contains an updating expression, the conditional expression is
an updating expression; otherwise it is a non-updating expression.
3.If the conditional expression is an updating expression, then both of its
branches must contain either an updating expression, an empty expression ( ),
or a call to the fn:error function; otherwise a static error is raised
[err:XUST0001]. In this case, the test expression is evaluated and the then or
else clause is selected and evaluated as specified in Section 3.10 of [XQuery
1.0]. The result of the conditional expression is the pending update list
returned by the selected branch.

This seems like a very complicated way of saying "If one of the branches of a
conditional expression is an updating expression, the other has to be one too".

I think Mary Holsteges comment in bug #2796 is very valid, disallowing this
will forbid so many use cases that it renders the whole thing entirely useless.
Received on Sunday, 6 August 2006 08:59:43 UTC

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