RDF2Go

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RDF2Go
Logo of RDF2Go
rdf2go.semweb4j.org/
Status: stable
Last release: 4.6.1 (April 30, 2008)
License: BSD
Affiliation: FZI

RDF2Go is an abstraction over triple (and quad) stores. It allows developers to program against rdf2go interfaces and choose or change the implementation later easily.

Contents

[edit] About

The three main features of RDF2Go are:

  • Program now, decide on triple store later - triple-centric API
  • Easy to extend - only a few simple methods have to be implemented by a triple (or quad) store
  • Triple and quad support - All techniques are available for triple and quad models

RDF2GO is released under the new BSD license. Alternative licensing is possible, just ask us. The project is funded by the European projects Knowledge Web and NEPOMUK.

Overview of changes (for full changelog, please consult the module-changelogs)

  • 4.6.2
    • Fixes the packaging of the API jar for OSGI
  • 4.6.1
    • JARS packaged for OSGI
    • Distribution now includes rdf2go.util (was missing by accident in 4.6.0 release)

[edit] Modules

RDF2Go consists of several parts that together make up the distribution. The JARs are named org.semweb4j.* and the Java packages in the JARs are still named org.ontoware.* to maintain compatibility with existing deployments.

[edit] rdf2go.api

The API.

  • Maven reports including links to JavaDocs, changelog, source code as HTML, JUnit test results, developer team, dependencies, list of open TODO tags in the code, ...
  • Releases (consider downloding the distribution instead)
  • Anonymous Subversion (use https:// for developer access)

[edit] rdf2go.impl.base

  • Maven reports including links to JavaDocs, changelog, source code as HTML, JUnit test results, developer team, dependencies, list of open TODO tags in the code, ...
  • Releases (consider downloding the distribution instead)
  • Anonymous Subversion (use https:// for developer access)

[edit] rdf2go.impl.base.test

  • Maven reports including links to JavaDocs, changelog, source code as HTML, JUnit test results, developer team, dependencies, list of open TODO tags in the code, ...
  • Releases (consider downloding the distribution instead)
  • Anonymous Subversion (use https:// for developer access)

[edit] rdf2go.impl.util

Utility classes running on top of any adapter. This contains e.g. the RDFTool class developed by DFKI.

  • Maven reports including links to JavaDocs, changelog, source code as HTML, JUnit test results, developer team, dependencies, list of open TODO tags in the code, ...
  • Releases (consider downloading the distribution instead)
  • Anonymous Subversion (use https:// for developer access)

[edit] rdf2go.impl.jena24

Implements the API and extends the impl.base classes. Delegates all calls to a Jena 2.4 model. This adapter provides only a Model implementation, no ModelSet, as Jena has no support for quads. (The new SDB or NG4J extensions have not been used due to lack of time, feel free to help out)

  • Maven reports including links to JavaDocs, changelog, source code as HTML, JUnit test results, developer team, dependencies, list of open TODO tags in the code, ...
  • Releases (consider downloding the distribution instead)
  • Anonymous Subversion (use https:// for developer access)
  • Status: up-to date with RDF2Go 4.6 API

[edit] rdf2go.impl.sesame20 (former: openrdf-rdf2go)

Implements the API and extends the impl.base classes. Delegates all calls to a Sesame 2.0.1 repository. This adapter provides a Model and a ModelSet implementation.

  • Maven reports including links to JavaDocs, changelog, source code as HTML, JUnit test results, developer team, dependencies, list of open TODO tags in the code, ...
  • Releases (consider downloding the distribution instead)
  • Anonymous Subversion (use https:// for developer access)
  • Status: up-to date with RDF2Go 4.6 API

[edit] YARS adapter

In previous versions of RDF2Go there was a YARS adapter which is no longer maintained due to lack of time. Do you want to help out? Contact us!


[edit] Documentation and Tutorial

Related Projects

[edit] Contact, Feedback, Help

  • Developer mailing list including archives - the best place to ask for help
    • The list server is going to die in the next 6 months - are Google groups a good alternative?
  • Issue tracker

Acknowledgements

[edit] Who uses RDF2GO?

  • RDFReactor - Object-oriented RDF access in Java, no RDF knowledge required at all (but an RDF Schema)
  • SemVersion - Versioning for RDF
  • Aperture - extracting and querying full-text content and metadata from various sources
  • Hyena - Universal RDF editor
  • NEPOMUK
  • SemFS

[edit] Developer Workflow

Example for the 4.3 - 4.6 release 

  public static void main(String[] args) throws ModelException {

	// getting model
	Model model = RDF2Go.getModelFactory().createModel();
        model.open();

	// creating URIs
	URI max = model.createURI("http://xam.de/foaf.rdf.xml#i");
	URI currentProject = model.createURI("http://xmlns.com/foaf/0.1/#term_currentProject");
	URI name = model.createURI("http://xmlns.com/foaf/0.1/#term_name");
	URI semweb4j = model.createURI("http://semweb4j.org");

	// adding a statement to the model
	model.addStatement(max, currentProject, semweb4j);
	model.addStatement(max, name, "Max Völkel");
		
	// dumping model to the screen
	model.dump();

        // query model for all names of max
        for(Statement stmt : model.getStatement(max,name, Variable.ANY) ) {
          // do something
        System.out.println( stmt.getObject() );
      }
 }
Facts about RDF2GoRDF feed
Affiliation FZI  +
Funded by Knowledge Web  +, and NEPOMUK  +
Homepage http://rdf2go.semweb4j.org/  +
License BSD  +
Name RDF2Go  +
Release date 30 April 2008  +
Status stable  +
Used by RDFReactor  +, SemVersion  +, Aperture  +, Hyena  +, NEPOMUK  +, and SemFS  +
Version 4.6.1  +
Retrieved from "http://semanticweb.org/wiki/RDF2Go"
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