Thanks Peter, Interacting with RDF data through Tinkerpop RDF components seams very interesting, I will test it asap.
Any information to load OWL specifications into Neo4J or guidance to design algorithms (managment of temporary data is the blocking point)? I would understand if you don't have time to clarify these points ;) SH On Sun, Nov 13, 2011 at 8:21 PM, Peter Neubauer < peter.neuba...@neotechnology.com> wrote: > Sebastian, > you can use Neo4j with RDF, we are running the Tinkerpop RDF > components. I am working on a RDF plugin, see > https://github.com/peterneubauer/sparql-plugin that runs inside the > Neo4j Server and talks REST. > > Java wise you can do like > > https://github.com/peterneubauer/sparql-plugin/blob/master/src/main/java/org/neo4j/server/plugin/sparql/SPARQLPlugin.java#L62 > and then execute queries like the Berlin dataset with something like > > > https://github.com/peterneubauer/sparql-plugin/blob/master/src/test/java/org/neo4j/server/plugin/sparql/BerlinDatasetTest.java > > Does that help? > > Cheers, > > /peter neubauer > > GTalk: neubauer.peter > Skype peter.neubauer > Phone +46 704 106975 > LinkedIn http://www.linkedin.com/in/neubauer > Twitter http://twitter.com/peterneubauer > > http://www.neo4j.org - NOSQL for the Enterprise. > http://startupbootcamp.org/ - Öresund - Innovation happens HERE. > > > > 2011/11/13 Sébastien HARISPE <harispe.sebast...@gmail.com>: > > Hi all, > > > > First of all, Thx a lot for your amazing work, simply astonishing... > > Below three questions related to my interest in using Neo4J as a Graph DB > > on top of which I want to test algorithms dedicated to large semantic > > graphs (OWL/RDF based). > > It would be nice if you could help me answer them. > > > > > > A -Using Neo4J with semantic web technologies like RDF/OWL/SPARQL: > > > > How does Neo4J interact with these technologies? > > > > I found/read: > > > > - an old post explaining how to load OWL into Neo4J using Jena API > > [1]< > http://sujitpal.blogspot.com/2009/05/using-neo4j-to-load-and-query-owl.html > > > > . > > - interesting classes in the org.neo4j.meta.model package > > [2<http://components.neo4j.org/neo4j-meta-model/snapshot/> > > ,3< > http://components.neo4j.org/neo4j-meta-model-import/snapshot/apidocs/org/neo4j/meta/input/owl/Owl2GraphDb.html > >] > > but I can't locate the package in the 1.5 apidocs > > [4]<http://components.neo4j.org/neo4j/1.5/apidocs/> > > . > > - that the org.neo4j.rdf and org.neo4j.meta do not follow the core > > components release, are they currently supported? > > - a ticket related to the addition of SPARQL plugin to the Neo4J > server, > > which means that semantic processes are part of your preoccupations ;). > > > > Can you detail the position of Neo4J considering OWL/RDF/SPARQL > > technologies? > > I can't easily find documentation about Neo4J and OWL > > [5<http://wiki.neo4j.org/content/OWL,_SPARQL,_SAIL,_and_RDF>], > > the use of RDF and SPARQL is well detailed however > > [6]<http://wiki.neo4j.org/content/RDF_/_SPARQL_Quickstart_Guide> > > . > > I also read about Sail on top of Neo4j > > [7]<https://github.com/datablend/neo4j-sail-test>, > > and to be honest, I'm quite lost... > > > > Do you think Neo4J is an interesting solution to interact with these > > technologies, that is to say, loading OWL specification as graph > > (simplification of the spec e.g classes, instances relationships between > > them), adding RDF triplet and using SPARQL? > > > > > > > > B - Algorithm implementations: > > > > As you know many graph algorithms need to store temporary results e.g. > > Dijkstra stores shortest path cost for all nodes during execution. > > Due to the size of the graphs, storing this information in memory is not > > possible most of the time, so how do you manage this information? > Temporary > > node properties? Is there guidance to implement algorithms using Neo4J? > > > > > > > > C - In-memory usage of Neo4J: > > > > In-memory graphs are very pleasant in order to perform certain CPU > > consuming algorithmic treatments on a reduced part of the graph. > > Considering an old post > > [8]<http://lists.neo4j.org/pipermail/user/2010-February/002719.html>, > > a proposed alternative was to rollback the transaction after the > treatment, > > i.e load the graph without flushing it. This make sense if you want to > load > > a new graph but is it possible to load a specific part of an existing > graph > > database in memory? Moreover, in the previously cited post you said that > > you planned to add an in-memory implementation but I can't find more > > information in the 1.5 doc, did I missed something? > > > > Thx, > > > > SH > > > > [1] > > > http://sujitpal.blogspot.com/2009/05/using-neo4j-to-load-and-query-owl.html > > [2] http://components.neo4j.org/neo4j-meta-model/snapshot/ > > [3] > > > http://components.neo4j.org/neo4j-meta-model-import/snapshot/apidocs/org/neo4j/meta/input/owl/Owl2GraphDb.html > > [4] http://components.neo4j.org/neo4j/1.5/apidocs/ > > [5] http://wiki.neo4j.org/content/OWL,_SPARQL,_SAIL,_and_RDF > > [6] http://wiki.neo4j.org/content/RDF_/_SPARQL_Quickstart_Guide > > [7] https://github.com/datablend/neo4j-sail-test > > [8] http://lists.neo4j.org/pipermail/user/2010-February/002719.html > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
