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Re: Comments about microdata

From: Henri Sivonen <hsivonen@iki.fi>
Date: Wed, 20 May 2009 09:57:02 +0300
Message-Id: <AB3BC048-CA13-4515-B6E7-44E6CE6ED778@iki.fi>
To: "public-html@w3.org WG" <public-html@w3.org>
On May 13, 2009, at 12:54, Henri Sivonen wrote:

> One of the most common points made in favor of RDFa in contrast to  
> microformats is the ability to say things about external resources.  
> Microdata in HTML5 has a predefined property called 'about'.  
> However, it is rather awkward as a mechanism for saying things about  
> external resources. I think it would be preferable to remove this  
> predefined property and instead make an a, area, audio, embed,  
> iframe, img, link, object, source, or video element imply its URI as  
> the subject URI when the element is used as an item.
> That is, this markup:
> <img alt='Hedral the cat' src='http://www.example.com/hedral.jpg'  
> id=hedral item> (Photo licensed under the <a href='http://creativecommons.org/licenses/by/3.0/' 
>  itemprop='license' subject=hedral>Creative Commons Attribution 3.0  
> Unported License</a>.
> would generate the following triple:
> <http://www.example.com/hedral.jpg> <http://www.w3.org/1999/xhtml/vocab#license 
> > <http://creativecommons.org/licenses/by/3.0/> .
> In JSON, there could be a string entry with the key 'url' next to  
> 'type' and 'properties'.
> - -
> Considering the example above, it might be useful to consider an  
> optimization allowing itemprops inside the legend of a figure to  
> apply to the first embedded-content child of the same figure. (Yeah,  
> this might be bad feature creep.)

Having realized that you can do this with fewer idrefs and special  
rules already, I withdraw the above comments.

For reference, you can do:
<figure item>
<img alt='Hedral the cat' src='http://www.example.com/hedral.jpg'  
<legend>Photo licensed under the <a href='http://creativecommons.org/licenses/by/3.0/' 
  itemprop='license'>Creative Commons Attribution 3.0 Unported  

Henri Sivonen
Received on Wednesday, 20 May 2009 06:57:42 UTC

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