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| <h1 class="title">ARQ - A SPARQL Processor for Jena</h1> |
| |
| <p>ARQ is a query engine for <a href="https://jena.apache.org/">Jena</a> that |
| supports the |
| <a href="http://www.w3.org/TR/sparql11-query/">SPARQL RDF Query language</a>. |
| SPARQL is the query language developed by the W3C |
| <a href="http://www.w3.org/2001/sw/DataAccess/">RDF Data Access Working Group</a>.</p> |
| <h2 id="arq-features">ARQ Features</h2> |
| <ul> |
| <li>Standard SPARQL</li> |
| <li>Free text search via Lucene</li> |
| <li>SPARQL/Update</li> |
| <li>Access and extension of the SPARQL algebra</li> |
| <li>Support for custom filter functions, including javascript functions</li> |
| <li>Property functions for custom processing of semantic |
| relationships</li> |
| <li>Aggregation, GROUP BY and assignment as SPARQL extensions</li> |
| <li>Support for federated query</li> |
| <li>Support for extension to other storage systems</li> |
| <li>Client-support for remote access to any SPARQL endpoint</li> |
| </ul> |
| <h2 id="introduction">Introduction</h2> |
| <ul> |
| <li><a href="/tutorials/sparql.html">A Brief Tutorial on SPARQL</a></li> |
| <li><a href="app_api.html">Application API</a> - covers the majority of |
| application usages</li> |
| <li><a href="faq.html">Frequently Asked Questions</a></li> |
| <li><a href="support.html">ARQ Support</a></li> |
| <li>Application <a href="/documentation/javadoc/arq/index.html">javadoc</a></li> |
| <li><a href="cmds.html">Command line utilities</a></li> |
| <li><a href="sparql-remote.html">Querying remote SPARQL services</a> |
| <ul> |
| <li><a href="http-auth.html">HTTP Authentication for ARQ</a></li> |
| </ul> |
| </li> |
| <li><a href="logging.html">Logging</a></li> |
| <li><a href="explain.html">Explaining queries</a></li> |
| <li><a href="manipulating_sparql_using_arq.html">Tutorial: manipulating SPARQL using ARQ</a></li> |
| <li><a href="service.html">Basic federated query (<code>SERVICE</code>)</a></li> |
| <li><a href="property_paths.html">Property paths</a></li> |
| <li><a href="group-by.html">GROUP BY and counting</a></li> |
| <li><a href="select_expr.html">SELECT expressions</a></li> |
| <li><a href="sub-select.html">Sub-SELECT</a></li> |
| <li><a href="negation.html">Negation</a></li> |
| </ul> |
| <p>Features of ARQ that are legal SPARQL syntax</p> |
| <ul> |
| <li> |
| <p><a href="function_forms.html">Conditions in FILTERs</a></p> |
| </li> |
| <li> |
| <p><a href="text-query.html">Free text searches</a></p> |
| </li> |
| <li> |
| <p><a href="rdf_lists.html">Accessing lists</a> (RDF collections)</p> |
| </li> |
| <li> |
| <p><a href="extension.html">Extension mechanisms</a></p> |
| <ul> |
| <li><a href="extension.html#valueFunctions">Custom Expression Functions</a></li> |
| <li><a href="extension.html#property-functions">Property Functions</a></li> |
| </ul> |
| </li> |
| <li> |
| <p>Library</p> |
| <ul> |
| <li><a href="library-function.html">Expression function library</a></li> |
| <li><a href="library-propfunc.html">Property function library</a></li> |
| </ul> |
| </li> |
| <li> |
| <p><a href="writing_functions.html">Writing SPARQL functions</a></p> |
| </li> |
| <li> |
| <p><a href="javascript-functions.html">Writing SPARQL functions in JavaScript</a></p> |
| </li> |
| <li> |
| <p><a href="programmatic.html">Constructing queries programmatically</a></p> |
| </li> |
| <li> |
| <p><a href="parameterized-sparql-strings.html">Parameterized query strings</a></p> |
| </li> |
| <li> |
| <p><a href="algebra.html">ARQ and the SPARQL algebra</a></p> |
| </li> |
| <li> |
| <p><a href="arq-query-eval.html">Extending ARQ query execution and accessing different storage implementations</a></p> |
| </li> |
| <li> |
| <p><a href="custom_aggregates.html">Custom aggregates</a></p> |
| </li> |
| </ul> |
| <h2 id="extensions">Extensions</h2> |
| <p>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 <code>Syntax.syntaxARQ</code>.</p> |
| <ul> |
| <li><a href="https://w3c.github.io/rdf-star/">RDF-star</a></li> |
| <li>Operators and functions |
| <code>[MOD](https://www.w3.org/TR/xpath-functions/#func-numeric-mod)</code> |
| and <code>[IDIV](https://www.w3.org/TR/xpath-functions/#func-numeric-integer-divide)</code> for modulus and integer division.</li> |
| <li><a href="assignment.html">LET variable assignment</a></li> |
| <li><a href="collation.html">Order results using a Collation</a></li> |
| <li><a href="construct-quad.html">Construct Quad</a></li> |
| <li><a href="generate-json-from-sparql.html">Generate JSON from SPARQL</a></li> |
| </ul> |
| <h2 id="update">Update</h2> |
| <p>ARQ supports the W3C standard SPARQL Update language.</p> |
| <ul> |
| <li><a href="http://www.w3.org/TR/sparql11-update/">SPARQL Update</a></li> |
| <li><a href="update.html">The ARQ SPARQL/Update API</a></li> |
| </ul> |
| <h2 id="see-also">See Also</h2> |
| <ul> |
| <li><a href="../fuseki2/index.html">Fuseki</a> - Server implementation of the SPARQL protocol.</li> |
| <li><a href="../tdb">TDB - A SPARQL database for Jena</a>, a pure Java persistence layer for large graphs, high performance applications and embedded use.</li> |
| <li><a href="../rdfconnection">RDFConnection</a>, a unified API for SPARQL Query, Update and Graph Store Protocol.</li> |
| </ul> |
| <h2 id="w3c-documents">W3C Documents</h2> |
| <ul> |
| <li><a href="http://www.w3.org/TR/sparql11-query/">SPARQL Query Language specification</a></li> |
| <li><a href="https://www.w3.org/TR/sparql11-results-json/">SPARQL Query Results JSON Format</a></li> |
| <li><a href="http://www.w3.org/TR/rdf-sparql-protocol/">SPARQL Protocol</a></li> |
| </ul> |
| <h2 id="articles">Articles</h2> |
| <p>Articles and documentation elsewhere:</p> |
| <ul> |
| <li><a href="http://xml.com/lpt/a/2005/11/16/introducing-sparql-querying-semantic-web-tutorial.html">Introducing SPARQL: Querying the Semantic Web</a> |
| (<a href="http://www.xml.com/">xml.com</a> article by Leigh Dodds)</li> |
| <li><a href="http://www.ibm.com/developerworks/xml/library/j-sparql/">Search RDF data with SPARQL</a> |
| (by Phil McCarthy) - article published on IBM developer works about |
| SPARQL and Jena.</li> |
| <li><a href="http://www.dajobe.org/2005/04-sparql/">SPARQL reference card</a> |
| (by <a href="http://www.dajobe.org/">Dave Beckett</a>)</li> |
| <li><a href="http://www.ldodds.com/blog/archives/000251.html">Parameterised Queries with SPARQL and ARQ</a> |
| (by Leigh Dodds)</li> |
| <li><a href="http://www.ldodds.com/blog/archives/000252.html">Writing an ARQ Extension Function</a> |
| (by Leigh Dodds)</li> |
| </ul> |
| <h2 id="rdf-syntax-specifications">RDF Syntax Specifications</h2> |
| <ul> |
| <li><a href="https://www.w3.org/TR/turtle/">Turtle</a></li> |
| <li><a href="https://www.w3.org/TR/n-triples">N-Triples</a></li> |
| <li><a href="https://www.w3.org/TR/trig/">TriG</a></li> |
| <li><a href="https://www.w3.org/TR/n-quads/">N-Quads</a></li> |
| </ul> |
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