PUBLIC MARKS with tags framework & SPARQL

Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, SPARQL and includes a rule-based inference engine. Jena is open source and grown out of work with the HP Labs Semantic Web Programme. The Jena Framework includes: * A RDF API * Reading and writing RDF in RDF/XML, N3 and N-Triples * An OWL API * In-memory and persistent storage * SPARQL query engine