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Re: ISSUE-1 Proposal: RDFa Profiles via the RDFa Vocabulary, bonus: the @map attribute

From: Ivan Herman <ivan@w3.org>
Date: Mon, 15 Mar 2010 07:23:52 +0100
Message-ID: <4B9DD278.7000801@w3.org>
To: Manu Sporny <msporny@digitalbazaar.com>
CC: RDFa WG <public-rdfa-wg@w3.org>


On 2010-3-15 03:59 , Manu Sporny wrote:
> This proposal outlines another potential implementation of the RDFa
> Profiles feature. It also defines @map as preferred to @xmlns, but for a
> different reason than the last proposal. The name @map is proposed in
> addition to rdfa:alias for extending the "list of mappings". The key
> difference is that neither @xmlns nor @map statements can be imported
> via the @profile attribute.
> 
> Proposal
> --------
> 
> * @xmlns is preserved and operates as it normally does in RDFa 1.0.
>   @xmlns is no longer required in languages that are namespace-unaware,
>   like HTML5.

Agreed

> * A new attribute is introduced called @map. The attribute contains
>   a set of key/value mappings. The syntax for map is the same as CSS,
>   which will make it easier to use for those already familiar with CSS.

I thought we had a discussion a while ago on giving an alternative to
@xmlns (confusingly enough I think we called that @vocab). This has been
put on ice, but yes, it is worth picking this up again. At the moment I
see that as a completely orthogonal issue to the current @profile
discussion.

> * @xmlns: extends the "list of mappings" in the current element scope
>   for languages that support it.

I do not understand what you mean:-( This is already in place, right?

> * @map extends the "list of mappings" in the current element scope.

... just as @xmlns does

> * A new RDFa Vocabulary is created with one term - rdfa:alias.
>   rdfa:alias is used to extend the "list of mappings" in documents
>   that import RDFa Profile document.
> 

Why is that different from the proposal in

http://www.w3.org/2010/02/rdfa/drafts/2010/ED-vocab-20100311/

(except of course for the property names, but that is a detail)

Sorry, I do not really understand the direction this is going...

Ivan


> Examples
> --------
> 
> Example of @map in a regular RDFa document:
> 
> <div map="dc: http://purl.org/dc/terms/ ;
>           Person: http://xmlns.com/foaf/0.1/Person">
>    <span property="dc:title">The @map proposal</span>
> ...
> </div>
> 
> Example in RDFa Profile document:
> 
> <div about="http://xmlns.com/foaf/0.1/Person">
>    <span property="rdfa:alias">Person</span>
> </div>
> <div about="http://xmlns.com/foaf/0.1/name">
>    <span property="rdfa:alias">name</span>
> </div>
> 
> Example in RDFa document that utilizes the Profile document above:
> 
> <div profile="http://example.org/foaf-profile"
>      about="#manu" typeof="Person">
>    <span property="name">Manu Sporny</span>
> </div>
> 
> -- manu
> 

-- 

Ivan Herman, W3C Semantic Web Activity Lead
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Received on Monday, 15 March 2010 06:23:22 GMT

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