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Re: Microdata: itemid attribute (feedback)

From: Martin McEvoy <martin@weborganics.co.uk>
Date: Tue, 27 Oct 2009 10:25:27 +0000
Message-ID: <4AE6CA97.4070200@weborganics.co.uk>
To: Ian Hickson <ian@hixie.ch>
CC: Jonas Sicking <jonas@sicking.cc>, John Giannandrea <jg@metaweb.com>, public-html@w3.org
Ian Hickson wrote:
> On Sun, 25 Oct 2009, Martin McEvoy wrote:
>> Jonas Sicking wrote:
>>>> Given that RDF has been deployed for a while now, can you give any 
>>>> example where this feature has been used? I.e. where several 
>>>> *independent* parties have described properties of the same object, 
>>>> and used this identifying mechanism to do it.
>> Yes there is one example I can think of ( not in a RDF sense ) I think 
>> the uid class in microformats hcard is intended to be used as a unique 
>> identifier of a hcard, it is also a url. The uid identifier is used to 
>> determine a representative hCard [1]. I like to think of it more as the 
>> canonical url of a hCard. Itemid and uid do seem very similar in 
>> concept.
>> [1] http://microformats.org/wiki/representative-hcard
> The Microdata vCard vocabulary excludes UID for this reason (there's a 
> comment in the source mentioning that itemid="" should be used instead).
>    http://www.whatwg.org/specs/vocabs/current-work/

You mentioned in an earlier email that @itemid is similar to @about in 
RDFa, @about in RDFa also supports relative urls do you think @itemid 
should too, I feel it would be useful in situations as I described in my 
first email[1] where @id and @itemid identify the same thing.

[1] http://lists.w3.org/Archives/Public/public-html/2009Oct/0896.html


Martin McEvoy

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Received on Tuesday, 27 October 2009 10:25:54 UTC

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