Apache Jena

Apache Jena is a free and open-source Java framework for building Semantic Web and Linked Data applications. It provides a comprehensive set of tools and libraries for working with RDF data, ontologies, and SPARQL queries. Jena enables developers to model, store, query, and reason over semantic data using W3C standards.

Features

• RDF API for creating and manipulating RDF graphs
• Support for multiple RDF syntaxes including RDF/XML, Turtle, and JSON-LD
• SPARQL engine (ARQ) for querying and updating RDF data
• TDB and TDB2 for high-performance, persistent triple stores
• Fuseki server for exposing SPARQL endpoints over HTTP
• Ontology API for working with RDFS and OWL models
• Inference API for rule-based reasoning and semantic entailment
• Modular architecture with extensible components

Capabilities

• Creation and serialization of RDF triples and graphs
• Execution of SPARQL queries including federated and full-text search
• Persistent storage and retrieval of RDF data using native triple stores
• Reasoning over RDF data using built-in or custom rule engines
• Integration with external reasoners and semantic tools
• Ontology management and semantic enrichment of data
• RESTful access to RDF data via Fuseki SPARQL server

Benefits

• Enables development of standards-compliant semantic web applications
• Facilitates data interoperability and integration across domains
• Enhances data understanding through reasoning and ontology support
• Scales from lightweight in-memory models to enterprise-grade triple stores
• Reduces development time with rich APIs and documentation
• Supported by a mature open-source community and active development