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[Bug 6538] [FS] Inconsistent following-sibling behaviour of attribute nodes

From: <bugzilla@wiggum.w3.org>
Date: Sun, 08 Feb 2009 07:03:53 +0000
To: public-qt-comments@w3.org
Message-Id: <E1LW3hp-0003yZ-8x@wiggum.w3.org>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=6538


Michael Dyck <jmdyck@ibiblio.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
            Summary|Inconsistent following-     |[FS] Inconsistent following-
                   |sibling behaviour of        |sibling behaviour of
                   |attribute nodes             |attribute nodes




--- Comment #1 from Michael Dyck <jmdyck@ibiblio.org>  2009-02-08 07:03:53 ---
I agree, FS's normalization rule for following-sibling is incorrect.
I propose we fix it by adding a 'where' clause to the right-hand side:

    [
        let $e := .
        where fn:not($e/self::attribute())
        return $e/parent::node()/child:: NodeTest [.>>$e]
    ]_Expr

And thanks for the heads-up re the following:: axis, although I believe
the danger is not that it would mistakenly yield an empty sequence,
but rather that it would yield a sequence that is missing the descendants 
of the attribute's parent. We could add them in explicitly, but I think
that would be fairly ugly. Instead, I suggest we go back to the definition:

    the 'following' axis contains all nodes that are descendants
    of the root of the tree in which the context node is found,
    are not descendants of the context node, and occur after
    the context node in document order

and express it thusly:

    [ following:: NodeTest ]_Axis
    ==
    [
        let $e := .
        return
            fn:root() / descendant:: NodeTest [. >> $e]
            except
            $e / descendant::node()
    ]_Expr


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Received on Sunday, 8 February 2009 07:04:03 UTC

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