Re: xmlns:XXX error in HTML5? (ISSUE-126)

On Oct 29, 2012, at 7:40 AM, Ivan Herman <ivan@w3.org> wrote:

> Guys,
> 
> this is one of our open issues and the pending question was whether the usage of @xmlns:XXX in HTML5 is an error or not. I have talked to Mike Smith, here is what he said. Usage of @xmlns:XXX is not called out explicitly as an error in HTML5. But it is an error due to the fact that HTML5 does not treat @xmlns:XXX specially; it is an attribute that is not defined for HTML5. As a consequence, using @xmlns:XXX is an error just as using @foo is an error because @foo has not beed defined neither as a global attribute nor as a local attribute for any particular element.
> 
> That is good enough for me to resolve ISSUE-126 as accepting @xmlns:XXX as an error in HTML5+RDFa (actually, not only for a validator, but in general).

+1 @prefix is the right way to define prefixes anyway. @xmlns is a vestige that isn't required for HTML5.

Gregg

> Ivan
> 
> P.S. B.t.w., when SVG is part of HTML5, namespaces cannot be used either, ie, what is xlink:href in the traditional SVG, is simply href in HTML5+SVG
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> 
> 
> ----
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
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> FOAF: http://www.ivan-herman.net/foaf.rdf
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