1 / 17

RDF(S) Tools

RDF(S) Tools. Adrian Pop, adrpo@ida.liu.se Programming Environments Laboratory Linköping University. <Outline/>. Introduction Tool categories parsers, validators editors, query tools databases, crawlers Editors demos RDFAuthor, IsaViz, RDFedt, InferEd Query Tools Jena RDQL demo

tallis
Télécharger la présentation

RDF(S) Tools

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RDF(S) Tools Adrian Pop, adrpo@ida.liu.se Programming Environments Laboratory Linköping University

  2. <Outline/> • Introduction • Tool categories • parsers, validators • editors, query tools • databases, crawlers • Editors demos • RDFAuthor, IsaViz, RDFedt, InferEd • Query Tools • Jena RDQL demo • Conclusions

  3. <Introduction/> • Resource Description Framework (RDF) • standard for describing resources on the web • RDF Schema (RDFS) • RDF Vocabulary Description Language • RDF(S) Tools must • read RDF data (parsers/validators) • store RDF data (XML format, triples, or relational/OO DBs) • use RDF data (applications, RSS news, etc) • manipulate RDF data (inference, query, etc)

  4. <Categories/> • Parsers (Jena, Redland, SWI-Prolog parser) • Validators (W3C RDF Validation service) • Editors (IsaViz, RDFAuthor, RDFEd, InferEd) • Query tools (Jena, etc) • Databases (RSSDB, RDFLib)

  5. <Parsers part=“1”/> • Jena - A semantic Web Framework for Java • http://jena.sourceforge.net/ • A RDF API • Reading and writing RDF in RDF/XML, N3 and N-Triples • An OWL API • In-memory and persistent storage • RDQL – a query language for RDF • Later on, a RDQL demo

  6. <Parsers part=“2”/> • Redland RDF Application Framework • http://www.redland.opensource.ac.uk/ • A modular, object based library written in C • Java, Perl, PHP, Python, Ruby and Tcl interfaces for manipulating the RDF graph and parts • Parsers and Serializers for reading and writing RDF • Storage for graphs in memory and on disk • Query APIs for the graph by Statement (triples) or by Nodes and Arcs • Statement Streams for construction, parsing, de/serialisation of graphs • Start of query language support. • No memory leaks so far

  7. <Parsers part=“3”/> • SWI-Prolog parser (Online Demo) • http://gollem.swi.psy.uva.nl/cgi-bin/pl-cvsweb/pl/packages/sgml/RDF/online.html?rev=1.11 • RDFS explorer, RDF Semantic Extensions • http://wonkituck.wi-inf.uni-essen.de/rdfs.html • Interesting feature: • provide semantics in Prolog for your properties <rdf:Property rdf:ID="path"> <rdfs:isDefinedAs rdf:parseType="Literal"> path(S,O) :- statement(S,path,O). path(X,Z) :- statement(X,path,Y), path(Y,Z). </rdfs:isDefinedAs> </rdf:Property>

  8. <Validators/> • RDF Validation Service • http://www.w3.org/RDF/Validator/ • Validating RDF Parser • http://139.91.183.30:9090/RDF/index.html • In general all the RDF parsers do some kind of validation

  9. <Editors part=“1” demo=“yes”/> • RDFAuthor • http://rdfweb.org/people/damian/2001/10/RDFAuthor/ RDFAuthor Demo

  10. <Editors part=“2” demo=“yes”/> • IsaViz • http://www.w3.org/2001/11/IsaViz/ IsaViz Demo

  11. <Editors part=“3” demo=“yes”/> • RDFedt • http://www.jan-winkler.de/dev/e_rdfe.htm RDFedt demo

  12. <Editors part=“4” demo=“yes”/> • InferEd • http://www.intellidimension.com/pages/site/products/infered/ InferEd Demo

  13. <Query demo=“yes”/> • Jena RDQL examples • Queries over the foaf.rdf file • Query 1, Select all SELECT * WHERE(?x ?y ?z) • Query 1, Select persons that knows me SELECT ?person, ?knows WHERE(?x <http://xmlns.com/foaf/0.1/knows> ?z), (?x <http://xmlns.com/foaf/0.1/name> ?person), (?z <http://xmlns.com/foaf/0.1/name> ?knows) • Go

  14. <Databases/> Storage of RDF graphs • Files • xml format, .n3 format, N-triples format • Databases • relational databases (MySQL, PostgreSQL) • Object-Oriented Databases (ZODB)

  15. <Conclusions/> • RDF Tools • are mature enough • become more complex • RDF is more widely used • RSS feeds • Mozilla sidebar, Bookmarks, etc • RDFGateway (application + web + RDF deductive DB)

  16. <End/> Thank you! Questions?

  17. Resources Ontology Storage and Querying http://139.91.183.30:9090/RDF/publications/tr308.pdf RDF Schema explorer + RDF Semantic Extensions http://wonkituck.wi-inf.uni-essen.de/rdfs.html Dave Beckett's Resource Description Framework (RDF) Resource Guide http://www.ilrt.bris.ac.uk/discovery/rdf/resources/ RDFAuthor, RDFAuthor Tutorial http://rdfweb.org/people/damian/2001/10/RDFAuthor/ http://rdfweb.org/people/damian/2001/10/RDFAuthor/Tutorial/ Jena - A semantic Web Framework for Java http://jena.sourceforge.net/ Redland RDF Application Framework http://www.redland.opensource.ac.uk/ RDF Validation Service http://www.w3.org/RDF/Validator/ Validating Parser (VRP), RDF Schema Specific Database (RSSDB), The RDF Query Language (RQL) http://139.91.183.30:9090/RDF/index.html RDFedt http://www.jan-winkler.de/dev/e_rdfe.htm

More Related