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Re: Maybe a new pandora's box? '/' in a term (not CURIE!)

From: Niklas Lindström <lindstream@gmail.com>
Date: Thu, 17 Nov 2011 11:42:10 +0100
Message-ID: <CADjV5jdQqiMHyb-m8VHVJsguqZhC5aT2Cqh0afh0Br1iJmXHYg@mail.gmail.com>
To: Gregg Kellogg <gregg@kellogg-assoc.com>
Cc: Ivan Herman <ivan@w3.org>, Shane McCarron <shane@aptest.com>, "public-rdfa-wg@w3.org" <public-rdfa-wg@w3.org>
Hi,

On Wed, Nov 16, 2011 at 4:13 PM, Gregg Kellogg <gregg@kellogg-assoc.com> wrote:
> On Nov 16, 2011, at 5:55 AM, "Ivan Herman" <ivan@w3.org> wrote:
>
>> Unless somebody vehemently opposes this, I would like to record it as an issue. May I?
>
> +1
>
> Clearly required for the schema.org extension mechanism. Re-defining Term should do it.

I haven't looked into the details, but couldn't relaxing TERM from
being an NCName get us into trouble? We'd have to redefine TERM very
carefully, so that CURIEs aren't also considered as terms. Since
colons are allowed in IRI segments, we'd have to determine whether
they'd be allowed at all in TERMs, and if so, only after an NCName
separated by any *other* gen-delim (as defined in the IRI spec)..

Another way to solve it could be to replace the use of
TERMorCURIEorAbsIRI with TERMorCURIEorIRI. I.e. not relax the lexical
space of terms, but rather allow for any IRIs including relative ones,
and define that these are appended to the current vocab. (Note
*appended*, not to be confused with *resolving* relative IRIs against
a base IRI.)

(Not sure what I'd vote for yet, I just wanted to remark on some specifics.)

Best regards,
Niklas


>> Ivan
>>
>> On Nov 16, 2011, at 14:47 , Shane McCarron wrote:
>>
>>> In my opinion, TERM can be extended to permit anything we want.  TERMs are tokens that are matched in a very specific way.  But you are correct that, today, a TERM cannot contain a slash (nor a question mark, nor a hash).
>>>
>>> On 11/16/2011 6:58 AM, Ivan Herman wrote:
>>>> As I said, I made a mistake, I refer to the term and not the CURIE...
>>>>
>>>>
>>>> On Nov 16, 2011, at 13:42 , Toby Inkster wrote:
>>>>
>>>>> On Wed, 16 Nov 2011 09:33:54 +0100
>>>>> Ivan Herman<ivan@w3.org>  wrote:
>>>>>
>>>>>> <div vocab="http://schema.org/" typeof="A/B">  ...</div>
>>>>> That should work. There's an example along those lines in section 7.4
>>>>> of RDFa Core:
>>>>>
>>>>>    <div prefix="db: http://dbpedia.org/">
>>>>>    <div about="db:resource/Albert_Einstein">
>>>>>    ...
>>>>>    </div>
>>>>>    </div>
>>>>>
>>>> This is an example for a CURIE. What I am looking for is a term usage, ie, together with @vocab
>>>>
>>>> Ivan
>>>>
>>>>
>>>>> The suffix part of a CURIE is an irelative-ref as defined by IRI. Not
>>>>> only can it contain a slash, it can contain a hash, a question mark,
>>>>> and pretty much anything else you like except unescaped whitespace.
>>>>>
>>>>>    <div prefix="http: http:">
>>>>>    <div about="http://tobyinkster.co.uk/#i">
>>>>>    ...
>>>>>    </div>
>>>>>    </div>
>>>>>
>>>>> In that example, the CURIE is perfectly legal. The @prefix attribute
>>>>> that defines it may or may not be legal - not quite sure. The part
>>>>> after the whitespace is supposed to be an xs:anyURI, and I'm not 100%
>>>>> sure whether "http:" is sufficient to satisfy that requirement, but it
>>>>> probably is, because xs:anyURI is defined very broadly.
>>>>>
>>>>> We may actually want to drop the requirement for the part after the
>>>>> whitespace in @prefix to be an xs:anyURI. (The only important thing
>>>>> should be that when it's combined with a suffix, it forms a valid IRI.)
>>>>> We should perhaps allow any string that does not contain whitespace
>>>>> there.
>>>>>
>>>>> --
>>>>> Toby A Inkster
>>>>> <mailto:mail@tobyinkster.co.uk>
>>>>> <http://tobyinkster.co.uk>
>>>>>
>>>>
>>>> ----
>>>> Ivan Herman, W3C Semantic Web Activity Lead
>>>> Home: http://www.w3.org/People/Ivan/
>>>> mobile: +31-641044153
>>>> FOAF: http://www.ivan-herman.net/foaf.rdf
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>> --
>>> Shane McCarron
>>> Managing Director, Applied Testing and Technology, Inc.
>>> +1 763 786 8160 x120
>>>
>>>
>>
>>
>> ----
>> Ivan Herman, W3C Semantic Web Activity Lead
>> Home: http://www.w3.org/People/Ivan/
>> mobile: +31-641044153
>> FOAF: http://www.ivan-herman.net/foaf.rdf
>>
>>
>>
>>
>>
>>
>
>
Received on Thursday, 17 November 2011 10:43:01 GMT

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