ARQ - A SPARQL Processor for Jena
- Standard SPARQL
- Free text search via Lucene
- Access and extension of the SPARQL algebra
- Support for custom filter functions
- Property functions for custom processing of semantic relationships
- Aggregation, GROUP BY and assignment as SPARQL extensions
- Support for federated query
- Support for extension to other storage systems
- Client-support for remote access to any SPARQL endpoint
- A Brief Tutorial on SPARQL
- Application API - covers the majority of application usages
- Frequently Asked Questions
- ARQ Support
- Application javadoc
- Command line utilities
- Explaining queries
- Tutorial: manipulating SPARQL using ARQ
- Basic federated query (
Advanced SPARQL use
Features of ARQ that were formally ARQ extensions but are now legal SPARQL 1.1:
Features of ARQ that are legal SPARQL syntax.
- Free text searches
- Accessing lists (RDF collections)
- Querying remote SPARQL services
- Constructing queries programmatically
- Parameterized query strings
- ARQ and the SPARQL algebra
- Extending ARQ query execution and accessing different storage implementations
Feature of ARQ that go beyond SPARQL syntax. The default query
language is standard SPARQL. These features require the query to be
parsed with an explicit declaration of
ARQ supports the W3C standard SPARQL Update language as well as the precursor submission to W3C. Using the standard is preferred; support for the submission is for legacy use.
- Fuseki - Server implementation of the SPARQL protocol.
- TDB - A SPARQL database for Jena, a pure Java persistence layer for large graphs, high performance applications and embedded use.
- SDB - A SPARQL database for Jena, using SQL databases.
Articles and documentation elsewhere:
- Introducing SPARQL: Querying the Semantic Web (xml.com article by Leigh Dodds)
- Search RDF data with SPARQL (by Phil McCarthy) - article published on IBM developer works about SPARQL and Jena.
- SPARQL reference card (by Dave Beckett)
- Parameterised Queries with SPARQL and ARQ (by Leigh Dodds)
- Writing an ARQ Extension Function (by Leigh Dodds)
- Turtle - a non-XML RDF serialization
Online Query Form for experimenting with SPARQL queries.