Re: About a network infrastructure

Hi Luciano

sharing my experience.

many years ago, i had the same idea: HTTP was not going to do it for
the semantic web.

How was i going to find out who knows something ABOUT someone? (only
thing i can do in HTTP is ask SOMEONE)

this led to an idea of a P2P algorithm for RDF.  There were several
proposals already but we wanted something that could scale, that is
where you DID NOT propagate queries but instead propagated small
fragments of information, this, back then, experimentally proven to be
more stable and seemed viable.

The result was the RDFGrowth algorithm

http://semanticweb.deit.univpm.it/submissions/ISWC2004_workshop_p2p/RDFGROWth_workshopISWC2004.pdf

It was implemented and powered a full p2p app if you want to see it in
action watch the screencast http://dbin.org you will see "information
growing" that is the real P2P working underneat (no hollywood trick
:-)) )

.. but it was a bad idea. Unnecessary,

I have matured the idea that p2p is pretty useless (and at High Risk
of wasting a ph.d student time) unless  you have something to CLEARY
"share":

Disk Space (we can have many more Mp3s if we join)  Computational
Resources (SETI lets find the aliens together)
Blaime (hey.. everyone is sharing mp3s so we are all more protected,
or more advicend freenet) network (Skype's P2P networking)

but in case of semantic web what do you want to share? RDF is small in
size enough to .. be negligible, nothing to hide, no real time
requirements, see? :-)  .

Plus the HTTP web mechanism provides natural means to asses trust e.g.
via pagerank or other web assessment algorithms which have been known
for ages.

.. so all you need is an index really (plus ability to do queries, to
centrally smush information (coming next) etc etc.. Thus the following
work, Sindice. Its really simple.
Google or Sindice are not closed systems, they work on standards..
anyone can redo them so nothing to be scared..
Not worrying about it is in fact sound "separation of concerns" (we
respect our API, you just use it)

The challage is (instead) to build useful applications based on
semantic on the web.

Can we do that ?

Giovanni

On Sun, Feb 8, 2009 at 6:30 PM, Luciano Bernardes de Paula
<luciano@dca.fee.unicamp.br> wrote:
>
> Hi everybody, my name is Luciano and I'm a PhD student.
>
> My research field is p2p networks, DHTs and recently I'm adding semantics to all these. Just a few days ago, I subscribed myself to this list, when I've found the LOD project. I'm following your debate about how to share the data.
>
> I think the LOD project is very interesting and goes right to the point to interconect data on the web, that is why the semantic web idea was created for.
>
> As I'm new in this "world", please, correct me if I'm wrong about something..
>
> One thing that I'm realizing is that the manner that the RDF data is found is very "centralized". Sites like "Ping the Semantic Web" and "Sindice" are fed with location of RDF data by the very users of these data. They're like a big index of RDF bases. Is that so?
>
> What I'm researching, and hope some feedback from you guys about, is how to create a network infrastructure, using the concepts of p2p (structured and unstructured), that all RDF bases can be put on top of.
>
> In a simple way, what I'm thinking of is an overlay network used to spread and recover semantic data (RDF) naturally. To publish your data or query about some data, you just need to have a node that is part of this overlay network (it could be one node per community...) or to know one node that is part of it. This overlay network would be composed by semantic links that interconnect the nodes, having semantic values in this links.
>
> I know it is very vague idea as it was presented here, but I hope you could send me some feedback.
>
> Am I getting all these correctly? Is there someone that is thinking about these issues? What do you think about it? Any advices/critics?
>
> Thank you for your attention.
>
> Best regards,
>
> Luciano
>
> ---------------------------------
> Luciano Bernardes de Paula
> DCA - FEEC - Unicamp
> www.dca.fee.unicamp.br/~luciano
> ---------------------------------
>
>
>      Veja quais são os assuntos do momento no Yahoo! +Buscados
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>
>
>

Received on Monday, 9 February 2009 10:35:59 UTC