W3C home > Mailing lists > Public > public-rdfa-wg@w3.org > January 2013

Re: HTML+RDFa source updated (ISSUE-97, ISSUE-144, ISSUE-146)

From: Gregg Kellogg <gregg@greggkellogg.net>
Date: Fri, 4 Jan 2013 19:18:35 -0500
To: "shane@aptest.com" <shane@aptest.com>
CC: Ivan Herman <ivan@w3.org>, Niklas Lindström <lindstream@gmail.com>, RDFa Working Group <public-rdfa-wg@w3.org>
Message-ID: <0B83C35F-8B8C-48B0-994A-B37A58ED94EA@greggkellogg.net>
> On Fri, Jan 4, 2013 at 2:17 PM, Gregg Kellogg <gregg@greggkellogg.net> wrote:
> > The only question I have is: link uses @rel in HTML; is that allowed for a Lite? I would think yes, but this may have to be written down somewhere...
> I would say that the use of @rel in <link> is not part of RDFa Lite, if the values of the @rel attribute would be interpreted by an RDFa processor. In other words, they can have terms which are ignored, but not CURIEs or IRIs.
> I am forced to disagree.  We have no way of constraining an RDFa Processor to only do things in a Lite context or a non-Lite context.  Consequently, any occurrence of @rel is going to be interpreted by a conforming processor.  And one conforming Processor cannot work differently than another with regard to the (minimal) triples generated, so all of the values of @rel are going to be processed. 

You're absolutely right that a conforming processor will interpret @rel as it would be anywhere else; it's just that, as a publishing profile, the use of @rel for RDFa Lite markup is not described, and I don't think it should be in the case of <link> either. Therefore, anyone trying to publish HTML5 with RDFa Lite using the <link> element shouldn't use @rel for RDFa markup; this may mean that @rel is used for other purposes, for which we already have text in RDFa Core to support.

> In theory a validator could flag the use of @rel on a <link> element, but why?  @rel is legal everywhere according to RDFa Lite.  At least that is my reading of the Profile.

Ivan may do something like this in his processor, as I believe he outputs warnings when non-RDFa Lite is detected; I don't know what he does in the case of @rel for non-RDFa usage, though.


> -- 
> Shane P. McCarron
> Managing Director, Applied Testing and Technology, Inc.
Received on Saturday, 5 January 2013 00:19:18 UTC

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