W3C home > Mailing lists > Public > public-lod@w3.org > September 2012

Re: Expensive links in Linked Data

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Sat, 29 Sep 2012 12:51:32 -0400
Message-ID: <50672714.4070908@openlinksw.com>
To: public-lod@w3.org
On 9/29/12 6:26 AM, Giovanni Tummarello wrote:
> Actually some interesting stuff was already in
>
> http://www.w3.org/Submission/2012/SUBM-ldbp-20120326/
>
> (e.g. paging, ordering) not sure what happened to it thought.
> i guess it will be considered in the WG you mention.
> It ends in 2014, looking forward to see the outcome.

The don't say anything about cursors (static, keyset, dynamic, and 
mixed), partial result sets (and effects of horizontal data 
partitioning) etc.. These hardcore DBMS issues are unavoidable. Data 
access specs (pre Linked Data) such as ODBC covered cursors and models.


Kingsley


>
> Gio
>
> On Fri, Sep 28, 2012 at 7:02 PM, Barry Norton <barry.norton@ontotext.com> wrote:
>> It's worth pointing out that there IS finally a W3C working group looking at
>> these issues:
>>
>> http://www.w3.org/2012/ldp/charter.html
>>
>>
>> Barry
>>
>> ----- Reply message -----
>> From: "SERVANT Francois-Paul" <francois-paul.servant@renault.com>
>> Date: Fri, Sep 28, 2012 17:54
>> Subject: Expensive links in Linked Data
>> To: "Giovanni Tummarello" <giovanni.tummarello@deri.org>
>> Cc: "Heiko Paulheim" <paulheim@ke.tu-darmstadt.de>, "public-lod@w3.org"
>> <public-lod@w3.org>
>>
>>
>> Hi,
>>
>> may I say that the situation you describe is a bit disappointing? The
>> unaddressed issues that you mention had already been raised shortly after
>> the publishing of the "linked data principles", years ago. I find it is a
>> pity if they remain unanswered, because this can jeopardize one of the major
>> benefits of RDF and Linked Data: the ability to publish data that can then
>> easily been read, aggregated and used in generic ways.
>>
>> Best,
>>
>> fps
>>
>>
>>
>>> -----Message d'origine-----
>>> De : g.tummarello@gmail.com [mailto:g.tummarello@gmail.com]
>>> De la part de Giovanni Tummarello
>>> Envoyé : vendredi 28 septembre 2012 17:13
>>> À : SERVANT Francois-Paul
>>> Cc : Heiko Paulheim; public-lod@w3.org
>>> Objet : Re: Expensive links in Linked Data
>>>
>>> Short answer is no,
>>>
>>> "linked data standards" have never addressed this and many
>>> other even basic problems(e.g. what if there are too many
>>> properties of one kind,  what kind of level of description
>>> you're supposed to get (e.g.
>>> recourse on blank nodes?), what is a standard way to find the
>>> entry URI for an object exposed given a description?  etc etc.
>>>
>>> Just create a normal web API (rest?)  and throttle/meter/bill
>>> as desired using one of the services to do that quickly my2c Gio
>>>
>>> On Fri, Sep 28, 2012 at 4:54 PM, SERVANT Francois-Paul
>>> <francois-paul.servant@renault.com> wrote:
>>>> Thanks,
>>>>
>>>> no, this doesn't solve the problem. A user gets ex:e0 (the "cheap"
>>>> resource). Though she can see that there is the link to the
>>> "expensive
>>>> resource", she doesn't know the meaning of the link (it is just an
>>>> owl:sameAs): she doesn't know what this is about. (Note also that
>>>> there could be several expensive properties)
>>>>
>>>> Best,
>>>>
>>>> fps
>>>>
>>>>
>>>>
>>>>> -----Message d'origine-----
>>>>> De : Heiko Paulheim [mailto:paulheim@ke.tu-darmstadt.de]
>>>>> Envoyé : vendredi 28 septembre 2012 16:42 À : public-lod@w3.org;
>>>>> SERVANT Francois-Paul Objet : Re: Expensive links in Linked Data
>>>>>
>>>>> Hi Francois-Paul,
>>>>>
>>>>> how about that solution:
>>>>>
>>>>> You publish the "cheap" data about your entity under
>>>>> http://example.org/e0, which is the "official" URI of that entity:
>>>>> ex:e0 owl:sameAs ex:e0expensive
>>>>> ex:e0 :cheapProp ...
>>>>>
>>>>> And under http://example.org/ex:e0expensive, you publish
>>>>> ex:e0expensive owl:sameAs ex:e0 ex:e0expensive :expensiveProp ...
>>>>>
>>>>> So people following links in LOD will always land at a
>>> page without
>>>>> the expensive properties, and those who really want to know can
>>>>> follow the sameAs link.
>>>>>
>>>>> Does that solve your problem?
>>>>>
>>>>> Best,
>>>>> Heiko
>>>>>
>>>>>
>>>>>
>>>>> Am 28.09.2012 16:32, schrieb SERVANT Francois-Paul:
>>>>>> Hi,
>>>>>>
>>>>>> How do you include links to results of computations in
>>> Linked Data?
>>>>>> For instance, you publish data about entities of a given
>>>>> class. A property, let's call it :expensiveProp, has this class as
>>>>> domain, and you know that computing or publishing the
>>> corresponding
>>>>> triples is expensive. In such a case, you don't want to
>>> produce these
>>>>> triples each time one of your entities is accessed. You want to
>>>>> include in the representation of your entity only a link to that
>>>>> information.
>>>>>> A no-brainer, at first sight.
>>>>>>
>>>>>> Are there any recommended ways to proceed?
>>>>>>
>>>>>> TIA
>>>>>>
>>>>>> fps
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>>>>>>
>>>>> --
>>>>> Dr. Heiko Paulheim
>>>>> Knowledge Engineering Group
>>>>> Technische Univ
>
>


-- 

Regards,

Kingsley Idehen	
Founder & CEO
OpenLink Software
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Received on Saturday, 29 September 2012 16:51:55 UTC

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