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Re: ISSUE-24: Proposal for dealing with case-insensitive terms in the XHTML vocabulary

From: Felix Sasaki <felix.sasaki@fh-potsdam.de>
Date: Wed, 14 Jul 2010 16:50:00 +0200
Message-ID: <AANLkTikZw5_5Mx26dG9WNe1-nDkB6Z6yOLYS0lFcQ9K2@mail.gmail.com>
To: Toby Inkster <tai@g5n.co.uk>
Cc: Shane McCarron <shane@aptest.com>, RDFa WG <public-rdfa-wg@w3.org>
Sorry for lurcking, a clarification question ...

2010/7/14 Toby Inkster <tai@g5n.co.uk>

> On Tue, 13 Jul 2010 17:01:52 -0500
> Shane McCarron <shane@aptest.com> wrote:
> > In XHTML+RDFa 1.1 we should say:
> >
> >     When referencing TERMs in the vocabulary at
> >     http://www.w3.org/1999/xhtml/vocab, TERMs must be mapped to lower
> > case.
> Does this also cover the case of the empty prefix? According to my
> reading of XHTML+RDFa 1.0, given the following:
>        rel="Next"
>        rel=":Next"
> The first is mapped to lower-case; the second is treated
> case-sensitively. This is because the former is a term and the latter
> is a CURIE.

At http://www.w3.org/TR/2010/WD-html-polyglot-20100624/#attribute-values ,
values of "rel" are described as always lower case. How does that (does it
at all?) relate to what you describe above?

Thanks for the clarification in advance,


> I suggest we retain this distinction, as there do exist mixed-case
> terms defined in the XHTML vocabulary (though they're not used by RDFa
> currently).
> Ivan wrote:
> > 2. in RDFa+XHTML (and I presume in RDFa+HTML5) there is a a default
> > @vocab, namely http://www.w3.org/1999/xhtml/vocab# and, if this is the
> > one in effect, then terms are interpreted in a case insensitive way,
> > ie, terms must be mapped on lower case.
> Personally I'd ditch that too -- you get too many junk results. Better
> to say that the default vocabulary in (X)HTML+RDFa is null.
> Otherwise you'll end up with having to deal with rel values from
> Microformats, etc. The problem with that it that Microformats have
> their own ways of determining what the "subject" is for a rel; applying
> RDF's @about/@src/chaining rules doesn't work well.
> To handle the case of rel="next", rel="prev", etc define a default
> *profile* for XHTML+RDFa, and have that profile define those terms
> case-insensitively. (The profile SHOULD be hard-coded in XHTML+RDFa
> parsers; authors MAY include an explicit @profile attribute referencing
> the default profile.)
> This means that parsers need to internally allow profiles to define
> both case-sensitive and case-insensitive terms, though we may decide
> not that profiles other than the XHTML vocab are not privileged to
> declare case-insensitive terms.
> This solution allows us to pick up "our" @rel terms but skim safely
> over the @rel terms used by Microformats, Javascript libraries, etc.
> --
> Toby A Inkster
> <mailto:mail@tobyinkster.co.uk>
> <http://tobyinkster.co.uk>
Received on Wednesday, 14 July 2010 14:50:35 UTC

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