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Re: Facebook Linked Data

From: Alvaro Graves <alvaro@graves.cl>
Date: Mon, 26 Sep 2011 08:05:22 -0700
Message-ID: <CAM1CqRP-zDdn4bBg4YppmWWiNt4LKciLMrE74KnmCTtV=0ZRSw@mail.gmail.com>
To: Sebastian Schaffert <sebastian.schaffert@salzburgresearch.at>
Cc: Jesse Weaver <weavej3@rpi.edu>, semantic-web@w3.org, public-lod@w3.org
Hi Sebastian,

AFAIK it's not a bug, but a feature :). This is done to comply with the
httpRange-14 issue (i.e., you can't retrieve a person through HTTP but you
can retrieve a document _about_ a person through HTTP). Since a person and a
document about a person are different entities, they should have different
URIs.

http://www.w3.org/2001/tag/issues.html#httpRange-14

----
Alvaro Graves

On Mon, Sep 26, 2011 at 7:46 AM, Sebastian Schaffert <
sebastian.schaffert@salzburgresearch.at> wrote:

> Dear Jesse,
>
> Thanks for the effort! I am just experimenting with this. If I request my
> own Vanity URL
>
> http://graph.facebook.com/sebastian.schaffert
>
> The data I get back is:
>
> @prefix rdf: <http://www.w3.org/1999/02/22-df-syntax-ns#> .
> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
> @prefix owl: <http://www.w3.org/2002/07/owl#> .
> @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
> @prefix api: <tag:graph.facebook.com,2011:/> .
> @prefix og: <http://ogp.me/ns#> .
> @prefix fb: <http://ogp.me/ns/fb#> .
> @prefix : <http://graph.facebook.com/schema/~/> .
> @prefix user: <http://graph.facebook.com/schema/user#> .
> </561666514#>
>        user:id "561666514" ;
>        user:name "Sebastian Schaffert" ;
>        user:first_name "Sebastian" ;
>        user:last_name "Schaffert" ;
>        user:link <http://www.facebook.com/sebastian.schaffert>
>
>
>
> Now the problem I see here is that the URI I requested is not the same URI
> as used in the subject of the RDF triples. Same holds btw if I request the
> data using the ID including "#". Which is bad in our case because we filter
> out triples that do not fulfill this condition to avoid importing "invalid"
> data.
>
> Also, the data should IMHO contain a @base statement defining the base for
> the </561666514#>, because when importing the data the original URI is
> sometimes no longer available.
>
> Lastly, the returned data does not contain the trailing "." required by
> turtle (see http://www.w3.org/TeamSubmission/turtle/#sec-grammar-grammar).
>
> Are there plans to fix this? For me, the more readable data would look like
> this:
>
> @prefix rdf: <http://www.w3.org/1999/02/22-df-syntax-ns#> .
> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
> @prefix owl: <http://www.w3.org/2002/07/owl#> .
> @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
> @prefix api: <tag:graph.facebook.com,2011:/> .
> @prefix og: <http://ogp.me/ns#> .
> @prefix fb: <http://ogp.me/ns/fb#> .
> @prefix user: <http://graph.facebook.com/schema/user#> .
> <http://graph.facebook.com/sebastian.schaffert>
>        user:id "561666514" ;
>        user:name "Sebastian Schaffert" ;
>        user:first_name "Sebastian" ;
>        user:last_name "Schaffert" ;
>        user:link <http://www.facebook.com/sebastian.schaffert>
>
>
>
> Am 23.09.2011 um 14:09 schrieb Jesse Weaver:
>
> > APOLOGIES FOR CROSS-POSTING
> >
> > I would like to bring to subscribers' attention that Facebook now
> > supports RDF with Linked Data URIs from its Graph API.  The RDF is in
> > Turtle syntax, and all of the HTTP(S) URIs in the RDF are dereferenceable
> > in accordance with httpRange-14.  Please take some time to check it out.
> >
> > If you have a vanity URL (mine is jesserweaver), you can get RDF about
> you:
> >
> > curl -H 'Accept: text/turtle' http://graph.facebook.com/<vanity-url>
> > curl -H 'Accept: text/turtle' http://graph.facebook.com/jesserweaver
> > If you don't have a vanity URL but know your Facebook ID, you can use
> > that instead (which is actually the fundamental method).
> >
> > curl -H 'Accept: text/turtle' http://graph.facebook.com/<facebook-id>
> > curl -H 'Accept: text/turtle' http://graph.facebook.com/1340421292
> >> From there, try dereferencing URIs in the Turtle.  Have fun!
> >
> > Jesse Weaver
> > Ph.D. Student, Patroon Fellow
> > Tetherless World Constellation
> > Rensselaer Polytechnic Institute
> > http://www.cs.rpi.edu/~weavej3/
> >
> >
> >
> >
> >
>
> Sebastian
> --
> | Dr. Sebastian Schaffert          sebastian.schaffert@salzburgresearch.at
> | Salzburg Research Forschungsgesellschaft  http://www.salzburgresearch.at
> | Head of Knowledge and Media Technologies Group          +43 662 2288 423
> | Jakob-Haringer Strasse 5/II
> | A-5020 Salzburg
>
>
>
Received on Monday, 26 September 2011 15:07:33 UTC

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