Semweb4j

From semanticweb.org

You know Java, and now You want to use semantic technologies or build semantic web applications? No problem. Use the toolkit semweb4j and get in a single download all you need to semantic-web-enable your application. Very little semantic web knowledge is required.

Contents 1 See also 2 Download 3 Developing Semweb4j 4 Road map 5 Lessons 5.1 Lesson 1: RDF Models 5.2 Lesson 2: Files and queries 5.3 Lesson 3: Multiple models 5.4 Lesson 4: RDF Schema 5.5 Lesson 5: Mapping RDF to Java 5.6 Lesson 6: Go to the web 5.7 Lesson 7: Bringing the pieces together

[edit] See also

• semweb4j project page (outdated)
• download (outdated)
• A paper on semweb4j

Bundled components:

• RDF2Go - a unified API to access RDF Models
• RDFReactor - generates convenient Java classes from an RDF Schema. The instances of the generated classes are live views on the RDF model. All get/set/update-calls are directly reflected as changed triples in the RDF model. You can also do SPARQL queries.
• jREST - makes web service development easier and type-safe. Simply write a class with a method "get" and start your web server with two lines of code.

[edit] Download

We publish our releases using Maven2. The repository lives at http://semweb4j.org/repo .

RDF2Go

• http://semweb4j.org/repo/org/semweb4j/rdf2go.dist/
  • choose the zip file to get all jars you might need.

RDFReactor

• http://semweb4j.org/repo/org/semweb4j/rdfreactor.runtime/
• http://semweb4j.org/repo/org/semweb4j/rdfreactor.generator/

There are currently no public releases of jREST and tutorial - but we work on it!

[edit] Developing Semweb4j

[edit] Road map

We plan to integrate jREST even more with the other tools, so that RDFReactor generates web-enabled components.

[edit] Lessons

[edit] Lesson 1: RDF Models

• What is RDF?
• How to configure and use a triple store
• Which triple store to use
• Add and remove triples
• Dumping a models content to System.out

[edit] Lesson 2: Files and queries

• Serialization: Read and write RDF files in different syntaxes
• Finding: Triple pattern queries
• Querying: SPARQL queries
  • SELECT, CONSTRUCT, DESCRIBE and ASK.

[edit] Lesson 3: Multiple models

• Using mutltiple models
• What are Named Graphs?
• How to merge models & more

[edit] Lesson 4: RDF Schema

• What is RDF Schema?
• Support for RDF Schema in semweb4j
• Finding and using an RDF Schema

[edit] Lesson 5: Mapping RDF to Java

• Generate Java classes from an RDF Schema with RDFReactor

[edit] Lesson 6: Go to the web

• Writing a web service with 10 lines of code
• REST in a nutshell
• Writing REST-ful services

[edit] Lesson 7: Bringing the pieces together

• A longer example, using all tools