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[Bug 6777] In HTML documents, no-namespace expression must match http://www.w3.org/1999/xhtml nodes

From: <bugzilla@wiggum.w3.org>
Date: Mon, 06 Apr 2009 15:52:24 +0000
To: public-qt-comments@w3.org
Message-Id: <E1Lqr7Y-0007i8-57@wiggum.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=6777





--- Comment #16 from Jonathan Robie <jonathan.robie@redhat.com>  2009-04-06 15:52:23 ---
(In reply to comment #15)
> (In reply to comment #14)
> > That
> > still wouldn't achieve compatibility of course - the only way to ensure that
> > the expression //p[namespace-uri()=''] continues to return the same result that
> > it does now is to map your HTML5 DOM to an XDM instance (or the XPath 1.0
> > equivalent) in which the p elements are in no namespace. Since you're so
> > concerned about compatibility, I can't see why you are so reluctant to do that.
> 
> That would address the backward-compatibility issue without addressing the
> forward-looking point of changing how HTML elements in the DOM are assigned to
> a namespace. The point of assigning HTML elements to the
> http://www.w3.org/1999/xhtml namespace is to make the data model representation
> consistent between the two serializations of HTML (text/html and
> application/xhtml+xml). So that in the future, authors can write XPath
> expressions with names in the http://www.w3.org/1999/xhtml namespace and those
> expressions work on DOMs regardless of whether the DOM came from text/html or
> application/xhtml+xml.


Name tests do something very simple: the test to see whether the name specified
in the name test is the same as the name of a node. If they don't match, the
test says they are not the same.

I think the tools you have to work with have already been identified - you have
control over the mapping to the data model, and you have control over the
default element namespace for queries. 

I don't think redefining XPath to account for the way you are mapping things
makes sense. It's a little like redefining the + operator if your accounts
don't balance, these are simple, well-defined operators that are universal, and
should not be adapted to particular use cases.

Jonathan


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Received on Monday, 6 April 2009 15:52:33 UTC

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