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Re: Schema.org External Enumerations mechanism

From: Martin Hepp <martin.hepp@ebusiness-unibw.org>
Date: Mon, 23 Apr 2012 09:13:59 +0200
Cc: Danny Ayers <danny.ayers@gmail.com>, Dan Brickley <danbri@danbri.org>, public-vocabs@w3.org
Message-Id: <BBE87F95-8F16-432E-8A17-6EC68411681D@ebusiness-unibw.org>
To: Guha <guha@google.com>
Hi Guha, all:

Note that for using Wikipedia URIs as identifiers for *types*, you can readily use 


It provides class definitions including translations for any lemma in Wikipedia. This could also be more strongly aligned with schema.org. It's also very scalable, running on Google App Engine.

For *individuals*, I would suggest to recommend DBpedia URIs but be open to other instances defined in the local namespace of a single Website. We use the same pattern e.g. in


For a rationale for www.productontology.org, see


Best wishes

Martin Hepp

On Apr 23, 2012, at 7:09 AM, Guha wrote:

> Your example is really good and has got me rethinking ...
> Let me think about it a bit more and get back to you.
> guha
> On Sun, Apr 22, 2012 at 9:49 AM, Danny Ayers <danny.ayers@gmail.com> wrote:
> On 22 April 2012 15:41, Danny Ayers <danny.ayers@gmail.com> wrote:
> Just to clarify with an example...
> > But where is the tangible utility in using schema.org URLs? As noted
> > earlier, they actually add friction to the system.
> ...ok, I'm visiting my mother this week, and a couple miles down the
> road is a hill fort called "Fin Cop". So how would I talk about that
> in microdata?
> I've no idea offhand what detail is available in schema.org for
> classifying places, but I can remember there is some coverage. So I
> start at:
> http://schema.org/Place
> I see:
> http://schema.org/LandmarksOrHistoricalBuildings
> and using an example from the Place page I already have:
>  <div itemprop="location" itemscope
> itemtype="http://schema.org/LandmarksOrHistoricalBuildings">
>    <a itemprop="url" href="...to be decided...">
>    Fin Cop
>    </a>
>  </div>
> But which URL to use?
> Wikipedia is blessed, so I search there and find:
> http://en.wikipedia.org/wiki/Fin_Cop
> Paste that into my markup, job done.
> Unless I want to use the schema.org alias. In which case I have to
> look up the appropriate template/mapping, apply it, and then use that
> URL.
> http://ext.schema.org/wikipedia/en/Fin_Cop
> Job done - after an extra step.
> Out of curiosity I had a quick go at getting a term for describing a
> place in a similar fashion using existing RDF vocabs. Starting with:
> http://sindice.com/search?q=Place
> a couple of clicks later I had:
> http://sw.opencyc.org/2009/04/07/concept/en/AncientSite
> Same as:
> http://umbel.org/umbel/sc/AncientSite
> - though there appear to be a lot of other alternatives.
> Putting "Fin Cop" into Google search, the most compelling-looking URL
> for the place on the first page of hits is the Wikipedia one (4th on
> the list here).
> So as far as the effort needed to find suitable terms, there wasn't
> really very much to choose between them. For data consumers, it seems
> probable that in due course the schema.org class will be more useful
> simply because of wider deployment. But well-known vocabularies like
> http://en.wikipedia.org/wiki/* are already widely deployed on the web
> (as regular links)...so why bother aliasing them?
> Cheers,
> Danny.
> --
> http://dannyayers.com
> http://webbeep.it  - text to tones and back again

martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen

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Received on Monday, 23 April 2012 07:14:27 UTC

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