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Re: Microdata: itemid attribute (feedback)

From: John Giannandrea <jg@metaweb.com>
Date: Sun, 25 Oct 2009 01:46:07 -0700
Cc: public-html@w3.org
Message-Id: <7D29A0D1-040B-4619-96E4-80788AA74624@metaweb.com>
To: Jonas Sicking <jonas@sicking.cc>

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.

If I understand your question correctly, yes, there is quite a lot of  
URI reuse going on in RDF.

For example, dbpedia URIs are used by many dissimilar RDF users, as  
are Musicbrainz URIs.
Here is a map of some of the URI sharing going on earlier this year,  
in the RDF community alone.

One could turn your question around and say, if I do have a strong  
external URI for the thing this page is talking about where am I  
supposed to put it in the markup when that markup contains a subset of  
the data available for that thing on the web?

itemid allows any itemscope (object in the DOM) to be annotated with  
what it is "about". Note that this is about the objects, not  
properties in a schema.  That use case is covered by using fully  
qualified URIs in itemprop or specifying an itemtype with a  
vocabulary, like vCard etc.

Received on Sunday, 25 October 2009 08:47:14 UTC

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