W3C home > Mailing lists > Public > public-xhtml2@w3.org > February 2009

Re: @rel syntax in RDFa (relevant to ISSUE-60 discussion), was: Using XMLNS in link/@rel

From: Julian Reschke <julian.reschke@gmx.de>
Date: Fri, 27 Feb 2009 23:19:14 +0100
Message-ID: <49A866E2.50703@gmx.de>
To: Ben Adida <ben@adida.net>
CC: noah_mendelsohn@us.ibm.com, Henri Sivonen <hsivonen@iki.fi>, Mark Nottingham <mnot@mnot.net>, HTMLWG WG <public-html@w3.org>, RDFa mailing list <public-rdf-in-xhtml-tf@w3.org>, public-xhtml2@w3.org, "www-tag@w3.org WG" <www-tag@w3.org>
Ben Adida wrote:
> Julian Reschke wrote:
>> Acknowledge that there is a problem (CURIE as rel value), and resolve
>> it, instead of pretending it's not.
> If there is a problem, I disagree that it is with CURIEs in @rel in
> XHTML1.1+RDFa. I believe the problem is in trying to interpret a raw
> link-type string without knowing where it came from.
> HTML supports @profile, which modifies the meaning of @rel values.
> @profile="http://bens-crazy-parser.com" could easily process
> rel="(:dc:)title" into http://purl.org/dc/terms/title. HTML4 effectively
> has a default @profile, with a number of pre-specified link-types [1].
> XHTML1.1+RDFa effectively has a default profile, too, where @rel values
> are interpreted as CURIEs (into URIs, of course.)
> In other words, any assumption one is making about generically parsing
> @rel without its language context is, in my opinion, strongly misguided.
> @profile can and does alter that interpretation. So if @profile can
> alter it for HTML4, then certainly the version of HTML has an effect on
> how @rel is interpreted. You can't interpret @rel blindfolded.

But I'd like to.

WRT profile; I see how this can work for a single profile URI, but it 
does not scale, so I'm not sure how this is supposed to help with mixing 
relations from several profiles (namespaces) in a single document.

> As I suggested in a previous email, one simple way to resolve this
> potential conflict with the link-type RFC is to specify, in the
> link-type RFC, that while the semantic value of a link-type should be a
> URI, its syntax may be language-dependent. This shouldn't be
> controversial, because this is already the case given @profile.
> ...

No, that's fine. What's controversial is how many different 
language-dependent interpretations there should be for the HTML family 
of languages. I think that number needs to be 1.

BR, Julian
Received on Friday, 27 February 2009 22:20:02 UTC

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