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

From: Shane McCarron <shane@aptest.com>
Date: Wed, 14 Jul 2010 09:33:18 -0500
Message-ID: <4C3DCAAE.1040607@aptest.com>
To: Toby Inkster <tai@g5n.co.uk>
CC: RDFa WG <public-rdfa-wg@w3.org>

I agree that rel=":Next" refers to a CURIE, not a term.  As such, the 
special processing rules I proposed to not apply.  However, I looked at 
the terms defined in http://www.w3.org/1999/xhtml/vocab/ and, at least 
for now, none of these terms are mixed case.   The terms defined therein 
include values for use in @role from the Role Attribute specification 
and from the WAI-ARIA specification in addition to the terms defined in 
XHTML 1/2.

On 7/14/2010 4:03 AM, Toby Inkster wrote:
> 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.
> 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.

Shane P. McCarron                          Phone: +1 763 786-8160 x120
Managing Director                            Fax: +1 763 786-8180
ApTest Minnesota                            Inet: shane@aptest.com
Received on Wednesday, 14 July 2010 14:34:13 UTC

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