W3C home > Mailing lists > Public > public-lod@w3.org > November 2008

Re: linked data hosted somewhere

From: Aldo Bucchi <aldo.bucchi@gmail.com>
Date: Tue, 25 Nov 2008 20:39:25 -0300
Message-ID: <7a4ebe1d0811251539q16641abfl8f36860b072d116f@mail.gmail.com>
To: "Hugh Glaser" <hg@ecs.soton.ac.uk>
Cc: "public-lod@w3.org" <public-lod@w3.org>
Hugh,

For example, I have a SPARQL service that might or might not return
data for some users, depending on a series of factors. That data adds
up.
I consider the endpoint to be an agent too.

This is more like a conversation going on.... SPARQL to SPARQL. In
fact, I remember seeing Henry Story using SPARQL to define a user-form
request in an x-forms manner.

SPARQL is just a way of asking things between agents. The rest of the
contract escapes the semantics of sparql itself.
An agent can even turn around and ask another agent if he doesn't
understand, and the conversation can go upstream.

SPARQL is just a totally different beast than SQL. It talks a
universal language over a distributed graph.

However, DOS still applies. As it can apply to Web servers...

Best,
A

On Tue, Nov 25, 2008 at 8:31 PM, Aldo Bucchi <aldo.bucchi@gmail.com> wrote:
> Hugh,
>
> It is a joke ;)
> By Bezzos I mean the founder of Amazon, again as a joke.
>
> Now, on the more serious side, you make some valid points.
> I believe others can provide better answers than me, but the best way
> I would answer is to skip this problem as I consider it a non-feature
> of the SW.
>
> It is important to remember the Open World Assumption under which we
> are operating as demarked by the "Open" part of Linking Open Data.
> This is where we depart from SQL, where we ( usually ) operate over
> finite datasets and expect a corresponding behaviour.
>
> I imagine that whoever provides an agent that acts as intermediary to
> the SW will have to define the rules of the game WRT to scale, just
> like Google draws a line at some point.
>
> Try to Google "everything".
> You just get one page back. Who makes the cut?
>
> The web is always bigger than any agent.
> Consumers must be aware of what they are consuming, and the
> limitations of their agents.
>
> I think SPARQL should remain an open, raw protocol over which data
> interchange occurs at varying levels of control (including no
> control). We simply shouldn't expect it to be as deterministic as SQL
> unless we control the universe we are operating in.
>
> Best,
> A
>
> On Tue, Nov 25, 2008 at 8:07 PM, Hugh Glaser <hg@ecs.soton.ac.uk> wrote:
>> I thought that might be the answer.
>> So what is the ontology of the error, so that my SW application can deal with it appropriately?
>> If it ain't RDF it ain't sensible in the Semantic Web.
>> ;-|
>> And the "entitlement" to spend lots of money by accident; a bit worrying, although I assume there are services that allow me to find out at least estimates of the cost.
>> I suspect that your comment about a bill is a bit of a joke, in that normal queries do not require money?
>> But it does raise an interesting LOD question.
>> Ravinder asked for LOD sets; if I have to pay for the query service, is it LOD?
>>
>> Getting back to dealing with awkward queries.
>> Detecting what are effectively DoS attacks is not always the easiest thing to do.
>> Has Bezzo really solved it for a SPARQL endpoint while providing a useful service to users with a wide variety of requirements?
>>
>> In fact, people don't usually offer open SQL access to Open Databases for exactly this reason.
>> I like to think the day will come when the Semantic Web is so widely used that we will have the same problem with SPARQL endpoints.
>>
>> Best
>> Hugh
>>
>> On 25/11/2008 22:48, "Aldo Bucchi" <aldo.bucchi@gmail.com> wrote:
>>
>> Yes!
>>
>> You will probably get an error and a bill by the end of the month for
>> the CPU you consumed doing that incredibly smart question.
>> Sounds pretty sensible to me, sort of what you'd expect from a
>> rhetoric question.
>>
>> ;)
>>
>> Much better than wrecking havoc in a lab by crashing a wacky server
>> somewhere... methinks.
>>
>>
>> On Tue, Nov 25, 2008 at 7:42 PM, Hugh Glaser <hg@ecs.soton.ac.uk> wrote:
>>> You mean I can SELECT * WHERE {?s ?p ?o } and get a sensible answer?
>>> That is exciting.
>>>
>>> On 25/11/2008 19:25, "Aldo Bucchi" <aldo.bucchi@gmail.com> wrote:
>>>
>>> Well,
>>>
>>> The good news is that with OpenLink's new offering, you're pretty much
>>> entitled to do all the wrong you want ;)
>>> I guess Bezzo's got it figured out...
>>>
>>> A
>>>
>>> On Tue, Nov 25, 2008 at 4:19 PM, Hugh Glaser <hg@ecs.soton.ac.uk> wrote:
>>>> As Kingsley said, most sites will provide such things.
>>>> If you want a load of SPARQL endpoints to have a go at (but please don't do
>>>> too much wrong!),
>>>> *.rkbexplorer.com/sparql currently has 35.
>>>>
>>>> Eg
>>>> Try putting SELECT * WHERE { ?s ?p "Sidharth Thakur" } into the box at
>>>> http://dblp.rkbexplorer.com/sparql/
>>>>
>>>> Or
>>>> http://dblp.rkbexplorer.com/sparql/?query=SELECT * WHERE { ?s ?p "Sidharth
>>>> Thakur" }
>>>> (Which actually should be encoded...)
>>>>
>>>> Have fun.
>>>> Hugh
>>>>
>>>> On 25/11/2008 18:10, "रविंदर ठाकुर   (ravinder thakur)"
>>>> <ravinderthakur@gmail.com> wrote:
>>>>
>>>>> i am looking for a service which provide LOD with _any_ protocol. even a low
>>>>> level query system like sparql will be awesome!!!
>>>>>
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Aldo Bucchi
>>> U N I V R Z
>>> Office: +56 2 795 4532
>>> Mobile:+56 9 7623 8653
>>> skype:aldo.bucchi
>>> http://www.univrz.com/
>>> http://aldobucchi.com
>>>
>>> PRIVILEGED AND CONFIDENTIAL INFORMATION
>>> This message is only for the use of the individual or entity to which it is
>>> addressed and may contain information that is privileged and confidential. If
>>> you are not the intended recipient, please do not distribute or copy this
>>> communication, by e-mail or otherwise. Instead, please notify us immediately by
>>> return e-mail.
>>> INFORMACIÓN PRIVILEGIADA Y CONFIDENCIAL
>>> Este mensaje está destinado sólo a la persona u organización al cual está
>>> dirigido y podría contener información privilegiada y confidencial. Si usted no
>>> es el destinatario, por favor no distribuya ni copie esta comunicación, por
>>> email o por otra vía. Por el contrario, por favor notifíquenos inmediatamente
>>> vía e-mail.
>>>
>>>
>>
>>
>>
>> --
>> Aldo Bucchi
>> U N I V R Z
>> Office: +56 2 795 4532
>> Mobile:+56 9 7623 8653
>> skype:aldo.bucchi
>> http://www.univrz.com/
>> http://aldobucchi.com
>>
>> PRIVILEGED AND CONFIDENTIAL INFORMATION
>> This message is only for the use of the individual or entity to which it is
>> addressed and may contain information that is privileged and confidential. If
>> you are not the intended recipient, please do not distribute or copy this
>> communication, by e-mail or otherwise. Instead, please notify us immediately by
>> return e-mail.
>> INFORMACIÓN PRIVILEGIADA Y CONFIDENCIAL
>> Este mensaje está destinado sólo a la persona u organización al cual está
>> dirigido y podría contener información privilegiada y confidencial. Si usted no
>> es el destinatario, por favor no distribuya ni copie esta comunicación, por
>> email o por otra vía. Por el contrario, por favor notifíquenos inmediatamente
>> vía e-mail.
>>
>>
>
>
>
> --
> Aldo Bucchi
> U N I V R Z
> Office: +56 2 795 4532
> Mobile:+56 9 7623 8653
> skype:aldo.bucchi
> http://www.univrz.com/
> http://aldobucchi.com
>
> PRIVILEGED AND CONFIDENTIAL INFORMATION
> This message is only for the use of the individual or entity to which it is
> addressed and may contain information that is privileged and confidential. If
> you are not the intended recipient, please do not distribute or copy this
> communication, by e-mail or otherwise. Instead, please notify us immediately by
> return e-mail.
> INFORMACIÓN PRIVILEGIADA Y CONFIDENCIAL
> Este mensaje está destinado sólo a la persona u organización al cual está
> dirigido y podría contener información privilegiada y confidencial. Si usted no
> es el destinatario, por favor no distribuya ni copie esta comunicación, por
> email o por otra vía. Por el contrario, por favor notifíquenos inmediatamente
> vía e-mail.
>



-- 
Aldo Bucchi
U N I V R Z
Office: +56 2 795 4532
Mobile:+56 9 7623 8653
skype:aldo.bucchi
http://www.univrz.com/
http://aldobucchi.com

PRIVILEGED AND CONFIDENTIAL INFORMATION
This message is only for the use of the individual or entity to which it is
addressed and may contain information that is privileged and confidential. If
you are not the intended recipient, please do not distribute or copy this
communication, by e-mail or otherwise. Instead, please notify us immediately by
return e-mail.
INFORMACIÓN PRIVILEGIADA Y CONFIDENCIAL
Este mensaje está destinado sólo a la persona u organización al cual está
dirigido y podría contener información privilegiada y confidencial. Si usted no
es el destinatario, por favor no distribuya ni copie esta comunicación, por
email o por otra vía. Por el contrario, por favor notifíquenos inmediatamente
vía e-mail.
Received on Tuesday, 25 November 2008 23:40:02 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 16:20:43 UTC