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Re: Discussion with Ian and Henri about HTML5+RDFa (part 2/2)

From: Mark Birbeck <mark.birbeck@webbackplane.com>
Date: Mon, 26 Jan 2009 12:06:13 +0000
Message-ID: <ed77aa9f0901260406u752dd132s39043a8bdbadc6b9@mail.gmail.com>
To: Julian Reschke <julian.reschke@gmx.de>
Cc: Dan Brickley <danbri@danbri.org>, Ben Adida <ben@adida.net>, Manu Sporny <msporny@digitalbazaar.com>, RDFa mailing list <public-rdf-in-xhtml-tf@w3.org>, Ian Hickson <ian@hixie.ch>, Henri Sivonen <hsivonen@iki.fi>, Sam Ruby <rubys@intertwingly.net>

Hi Julian,

I'm afraid it's the use of full URIs in @rel that is not backwards
compatible, as I explained, since it makes every value, such as "next"
or "foo", into a relative path.

That in itself wouldn't be a problem except for the fact that you
can't have *both* predefined and user-defined values being relative
paths against the same base URI.

By the way, how is RDFa's use of @rel not backwards-compatible?



On Mon, Jan 26, 2009 at 11:59 AM, Julian Reschke <julian.reschke@gmx.de> wrote:
> Mark Birbeck wrote:
>> ...
>> The other model that was considered was that @rel contains a URI. In
>> this case @rel="next" is actually a relative path, and we would
>> hard-code the fact that it's relative to a 'base' that is the XHTML
>> vocabulary. Unfortunately that puts @rel="foo" also into the XHTML
>> vocabulary, and it also means that for authors to add their own values
>> they need to express them as full URIs, which is quite laborious and
>> error-prone.
>> ...
> For the record: I'm still VERY unhappy with the fact that RDFa imposes a
> syntax on the rel attribute that is likely to be incompatible with the way
> it's used elsewhere (sticking plain URIs into it).
> Requiring CURIEs for *new* attributes is fine, but imposing a potentially
> non-backwards compatible syntax onto existing attributes is an entirely
> different story...
> BR, Julian

Mark Birbeck, webBackplane



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Received on Monday, 26 January 2009 12:06:48 UTC

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