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On Fri, 2003-12-19 at 18:29, Tim Bray wrote:
> On Dec 19, 2003, at 8:12 AM, Simon St.Laurent wrote:
>
> > He also points to a nice analogy from Mark Nottingham:
> >
> > http://www.mnot.net/blog/2003/12/06/qnames_are_evil
> >
> > It's good to confirm that issues derided as mere aesthetic blotches are
> > capable of causing real problems for sophisticated tools - and users.
>
> It is now crystal-clear that allowing qnames to escape from element &
> attribute names into content was a terrible mistake that we're now
> stuck with forever. I struggled against this idea but lost. -Tim
We can still try to avoid that they spread out into new vocabularies.
I have done my best to limit their impact within RELAX NG and I think we
should continue to bark each time they are considered in a new
vocabulary.
The last I came on was in "new syntaxes for RDF"
http://www.ilrt.bris.ac.uk/discovery/2003/11/new-syntaxes-rdf/paper.html
That includes in its XML syntax requirements: "Be a ``modern'' XML
syntax - such as using XML QNames in attribute values".
Maybe we should also be clear about what's wrong about using QNames.
For me, it's not that much the use a prefixes which is wrong but the
fact that they rely on a definition which is part of the markup.
In other words, I think that this is wrong:
<foo xmlns:bar="http://example.com/bar";>bar:baz</foo>
But if an application wants to allow things such as:
<foo prfx="bar http://example.com/bar";>bar:baz</foo>
I don't see any reason to object. That may not be optimal, but that
doesn't violate any hard rule.
Eric
--
Curious about Relax NG? Read my upcoming book online.
http://books.xmlschemata.org/relaxng/
Upcoming XML schema languages tutorial:
- Santa Clara -half day- (15/03/2004) http://masl.to/?J24916E96
------------------------------------------------------------------------
Eric van der Vlist http://xmlfr.org http://dyomedea.com
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
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