Re: ISSUE-132 (Is @src allowed everywhere?): Is the @src attribute defined in RDFa Core allowed on any element? [3rd LC Comments - RDFa 1.1 Core]

RDFa Core does NOT define a content model for anything.  It does not say 
what attributes are on what elements, because it does not TALK about 
elements.  The host language conformance section, which we have not 
changed in ages, says "The attributes defined in this 
specification/must/be included in the content model of the Host 
Language."  Again, it does not say where.

Arguably we have made a mistake in section 5 in that we say href, src, 
rel, and rev are defined in this specification.  They are NOT.  In 
particular href and src are not defined in RDFa Core and are NOT 
required to be present in host languages.  In section 7.5 we say "This 
specification defines processing rules for optional attributes that may 
not be present in all Host Languages (e.g., @href:). If these attributes 
are not supported in the Host Language, then the corresponding 
processing rules are not relevant for that language."  We used to have 
text that indicated which attributes were optional.  I cannot find that 
text now.  (Aside - there is a typo on there.  a colon after href.  I 
will fix that in the source).

My suggestion would be that we do two things:

1. Add text in the host language conformance clause that says "The 
required attributes defined in this specification/must/be included in 
the content model of the Host Language.  The elements on which these 
attributes can occur is at the discretion of the Host Language."

2. (re)mark @href and @src as optional.  I don't know why they are not 
marked optional.  They obviously are.

On 2/19/2012 11:41 PM, Ivan Herman wrote:
> On 20 Feb 2012, at 05:42, RDF Web Applications Working Group Issue Tracker<sysbot+tracker@w3.org>  wrote:
>
>> ISSUE-132 (Is @src allowed everywhere?): Is the @src attribute defined in RDFa Core allowed on any element? [3rd LC Comments - RDFa 1.1 Core]
>>
>> http://www.w3.org/2010/02/rdfa/track/issues/132
>>
>> Raised by: Manu Sporny
>> On product: 3rd LC Comments - RDFa 1.1 Core
>>
>> Raised by Henri Sivonen:
>>
>> The RDF Web Apps WG had previously decided that the @href, @rel and @rev attributes were to be allowed on any element. The current RDFa Core specification defines @src, and the processing rules for @src, but does not mention if the attribute is allowed everywhere.
>>
>> The assumption is that where @href, @rel, @rev, and @src are allowed is up to the Host Language (do we say this in the spec anywhere, and if we don't, we should). I don't think we ever intended @src to be used everywhere, but both Henri and Mike Smith's interpretation of the HTML+RDFa spec was that @src was allowed everywhere.
>>
>> 1. I don't think we ever meant @src to be allowed everywhere, we should clarify this.
> Same for @href.
>
>> 2. We should also make it clear that it is up to the Host Language to define which elements can hold @href, @src, @rel, and @rev.
> Agreed
>
>> 3. The HTML+RDFa spec should make it more clear which attributes are allowed on which elements.
>>
> Agreed.
>
> Ivan
>
>>
>>

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Shane McCarron
Managing Director, Applied Testing and Technology, Inc.
+1 763 786 8160 x120