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Re: Facebook Linked Data

From: Alvaro Graves <alvaro@graves.cl>
Date: Mon, 26 Sep 2011 08:37:38 -0700
Message-ID: <CAM1CqRPgSexoLKo7_XYRLhX6k_udPcCBofxOu70Nc+uN=5YjpQ@mail.gmail.com>
To: public-lod@w3.org, "semantic-web@w3.org >> \"semantic-web@w3.org\"" <semantic-web@w3.org>
>
> We don't have to bring httpRange-14 and its timeless imbroglio into every
> conversation re. Linked Data :-)


True :) the only important thing is to make clear that facebook URIs for
documents are different from URIs for people.
----
Alvaro Graves


On Mon, Sep 26, 2011 at 8:34 AM, Kingsley Idehen <kidehen@openlinksw.com>wrote:

> On 9/26/11 11:16 AM, Sebastian Schaffert wrote:
>
>> But then I would say the server should at least reply with a 30x redirect
>> ;-)
>>
>
> Not necessarily, they choosen to implement indirection internally, rather
> than via HTTP response headers. Naturally, doing via HTTP is more flexible
> and thereby desirable, but we have to accept that "half bread is better than
> none" re. this matter i.e., any kind of indirection is better than no
> indirection re. disambiguation of Data Object ID and Address for accessing
> its Representation.
>
> Kingsley
>
>  Greetings,
>>
>> Sebastian
>>
>> Am 26.09.2011 um 17:05 schrieb Alvaro Graves:
>>
>>  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<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<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<http://graph.facebook.com/sebastian.schaffert>
>>>
>>> The data I get back is:
>>>
>>> @prefix rdf:<http://www.w3.org/1999/**02/22-df-syntax-ns#<http://www.w3.org/1999/02/22-df-syntax-ns#>>
>>>  .
>>> @prefix rdfs:<http://www.w3.org/2000/**01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>>
>>>  .
>>> @prefix owl:<http://www.w3.org/2002/**07/owl#<http://www.w3.org/2002/07/owl#>>
>>>  .
>>> @prefix xsd:<http://www.w3.org/2001/**XMLSchema#<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/~/<http://graph.facebook.com/schema/~/>>
>>>  .
>>> @prefix user:<http://graph.facebook.**com/schema/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<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<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#<http://www.w3.org/1999/02/22-df-syntax-ns#>>
>>>  .
>>> @prefix rdfs:<http://www.w3.org/2000/**01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>>
>>>  .
>>> @prefix owl:<http://www.w3.org/2002/**07/owl#<http://www.w3.org/2002/07/owl#>>
>>>  .
>>> @prefix xsd:<http://www.w3.org/2001/**XMLSchema#<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/schema/user#>>
>>>  .
>>> <http://graph.facebook.com/**sebastian.schaffert<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<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<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<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/ <http://www.cs.rpi.edu/~weavej3/>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>  Sebastian
>>> --
>>> | Dr. Sebastian Schaffert          sebastian.schaffert@**
>>> salzburgresearch.at <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
>>>
>>>
>>>
>>>  Sebastian
>>
>
>
> --
>
> Regards,
>
> Kingsley Idehen
> President&  CEO
> OpenLink Software
> Web: http://www.openlinksw.com
> Weblog: http://www.openlinksw.com/**blog/~kidehen<http://www.openlinksw.com/blog/~kidehen>
> Twitter/Identi.ca: kidehen
>
>
>
>
>
>
>
Received on Monday, 26 September 2011 15:38:57 UTC

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