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Re: API for querying a set of RDF graphs?

From: Alexander Löser <aloeser@cs.tu-berlin.de>
Date: Fri, 21 Mar 2003 17:13:25 +0100
Message-ID: <3E7B3A25.5A07D805@cs.tu-berlin.de>
To: Benja Fallenstein <b.fallenstein@gmx.de>
Cc: rdf-i <www-rdf-interest@w3.org>

Hi Benja,

you should look at "Edutella". (http://edutella.jxta.org) This System
combines the advantages of the Jena API (Reading writing RDF Graphs) and the
JXTA Plattform of SUN (P2P based Plattform that provides communication and
routing layers based on the jxta Protokoll over http and tcp) to build an
infrastrukture for distributing queries to autonomous heterogenous
distributed sources. The system has been developed by the Learning Lab Lower
Saxony L3S.

Demos are aviable at: http://edutella.jxta.org/downloads/index.html

Papers are aviable at:

http://edutella.jxta.org/reports/edutella-whitepaper.pdf
http://cis.cs.tu-berlin.de/~aloeser/gk/publications/Caise03_submission_Loeser_Nejdl_Wolpers_Siberski.PDF

http://cis.cs.tu-berlin.de/~aloeser/gk/publications/p510-nejdl.pdf


Alex



Benja Fallenstein wrote:

> Hi all,
>
> I am developing a system that stores a number of RDF graphs, possibly
> downloaded from different places, and I need to run queries over that
> data. (The store may also be the virtual collection of all graphs
> available on a p2p network.) I may not trust all graphs in my store for
> all purposes. I'm imagining an API that would let me run simple queries
> over all the graphs (individually; I don't need to solve the harder
> problem where two graphs taken together answer the query), and return
> results together with a tag saying which graph a result came from. Then
> I could decide which of the graphs is applicable, meaning a) trustworthy
> and b) a current, not an obsoleted version.
>
> I've been doing some work on this, but it occurs to me that such an API
> would be useful for the Semantic Web in general-- querying a search
> engine or similar service for published graphs that answer some query.
> So I was wondering, do APIs for this purpose exist-- especially in Java?
> The APIs I've looked at so far seem to be geared at querying a single
> graph (which may be the virtual union of other graphs, but such an API
> would not provide me with information about which graph a result came
> from, making it impossible to evaluate which results can be trusted and
> which can't).
>
> So, which APIs like this are out there?
>
> Thanks for your help,
> - Benja Fallenstein

--
______________________________________

  Alexander Löser
  Technische Universitaet Berlin
  Fakultaet IV - CIS
  bmb+f-Projekt: "NewEconomy"
  "Neue Medien in der Bildung"

  email: aloeser@cs.tu-berlin.de
  office: +49- 30-314-25555
  fax   : +49- 30-314-21601
______________________________________
Received on Friday, 21 March 2003 11:20:53 GMT

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