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| <h1 class="title">TDB Assembler</h1> |
| |
| <p><a href="/documentation/assembler/">Assemblers</a> |
| are a general mechanism in Jena to describe objects to be built, |
| often these objects are models and datasets. Assemblers are used |
| heavily in <a href="../fuseki2/">Fuseki</a> for |
| dataset and model descriptions, for example.</p> |
| <p>SPARQL queries operate over an |
| <a href="http://www.w3.org/TR/sparql11-query/#rdfDataset" title="http://www.w3.org/TR/rdf-sparql-query/#rdfDataset">RDF dataset</a>, |
| which is an unnamed, default graph and zero or more named graphs.</p> |
| <p>Having the description in a file means that the data that the |
| application is going to work on can be changed without changing the |
| program code.</p> |
| <h2 id="contents">Contents</h2> |
| <ul> |
| <li><a href="#dataset">Dataset</a> |
| <ul> |
| <li><a href="#union-default-graph">Union Default Graph</a></li> |
| </ul> |
| </li> |
| <li><a href="#graph">Graph</a></li> |
| <li><a href="#mixed-datasets">Mixed Datasets</a></li> |
| <li><a href="#rdfs">RDFS</a></li> |
| </ul> |
| <h2 id="dataset">Dataset</h2> |
| <p>This is needed for use in <a href="../fuseki2/" title="Fuseki">Fuseki</a>.</p> |
| <p>A dataset can be constructed in an assembler file:</p> |
| <pre><code>PREFIX tdb: <http://jena.hpl.hp.com/2008/tdb#> |
| PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> |
| PREFIX ja: <http://jena.hpl.hp.com/2005/11/Assembler#> |
| |
| <#dataset> rdf:type tdb:DatasetTDB ; |
| tdb:location "DB" ; |
| . |
| </code></pre> |
| <p>Only one dataset can be stored in a location (filing system |
| directory).</p> |
| <p>The first section declares the prefixes used later:</p> |
| <pre><code>PREFIX tdb: <http://jena.hpl.hp.com/2008/tdb#> |
| PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> |
| PREFIX ja: <http://jena.hpl.hp.com/2005/11/Assembler#> |
| </code></pre> |
| <p>then there is the description of the TDB dataset itself:</p> |
| <pre><code><#dataset> rdf:type tdb:DatasetTDB ; |
| tdb:location "DB" ; |
| </code></pre> |
| <p>The property <code>tdb:location</code> gives the file name as a string. It is |
| relative to the applications current working directory, not where |
| the assembler file is read from.</p> |
| <p>The dataset description is usually found by looking for the one |
| subject with type <code>tdb:GraphDataset</code>. If more than one graph is |
| given in a single file, the application will have to specify which |
| description it wishes to use.</p> |
| <h3 id="union-default-graph">Union Default Graph</h3> |
| <p>An assembler can specify that the default graph for query is the |
| union of the named graphs. This is done by adding |
| <em>tdb:unionDefaultGraph</em>.</p> |
| <pre><code><#dataset> rdf:type tdb:DatasetTDB ; |
| tdb:location "DB" ; |
| tdb:unionDefaultGraph true ; |
| . |
| </code></pre> |
| <h2 id="graph">Graph</h2> |
| <p>TDB always stores data in an RDF dataset. It is possible to use |
| just one of the graphs from the dataset. A common way of working |
| with one graph is to use the default graph of the dataset.</p> |
| <p>A single graph from a TDB dataset can be described by:</p> |
| <pre><code>PREFIX tdb: <http://jena.hpl.hp.com/2008/tdb#> |
| PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> |
| PREFIX ja: <http://jena.hpl.hp.com/2005/11/Assembler#> |
| |
| <#dataset> rdf:type tdb:DatasetTDB ; |
| tdb:location "DB" ; |
| |
| <#graph> rdf:type tdb:GraphTDB ; |
| tdb:dataset <#dataset> . |
| </code></pre> |
| <p>A particular named graph in the dataset at a location can be |
| assembled with:</p> |
| <pre><code><#graphNamed> rdf:type tdb:GraphTDB ; |
| tdb:dataset <#dataset> ; |
| tdb:graphName <http://example/graph1> ; |
| . |
| </code></pre> |
| <h2 id="mixed-datasets">Mixed Datasets</h2> |
| <p>It is possible to create a dataset with graphs backed by different |
| storage subsystems, although query is not necessarily as |
| efficient.</p> |
| <p>To include as a named graph in a dataset use vocabulary as shown |
| below:</p> |
| <pre><code>PREFIX tdb: <http://jena.hpl.hp.com/2008/tdb#> |
| PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> |
| PREFIX ja: <http://jena.hpl.hp.com/2005/11/Assembler#> |
| |
| # A dataset of one TDB-backed graph as the default graph and |
| # an in-memory graph as a named graph. |
| <#dataset> rdf:type ja:RDFDataset ; |
| ja:defaultGraph <#graph> ; |
| ja:namedGraph |
| [ ja:graphName <http://example.org/name1> ; |
| ja:graph <#graph2> ] ; |
| . |
| |
| <#graph> rdf:type tdb:GraphTDB ; |
| tdb:location "DB" ; |
| . |
| |
| <#graph2> rdf:type ja:MemoryModel ; |
| ja:content [ja:externalContent <file:Data/books.n3> ] ; |
| . |
| </code></pre> |
| <p>Note here we added:</p> |
| <pre><code>tdb:DatasetTDB rdfs:subClassOf ja:RDFDataset . |
| tdb:GraphTDB rdfs:subClassOf ja:Model . |
| </code></pre> |
| <p>which provides for integration with complex model setups, such as |
| reasoners.</p> |
| <h2 id="rdfs">RDFS</h2> |
| <pre><code>PREFIX tdb: <http://jena.hpl.hp.com/2008/tdb#> |
| PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> |
| PREFIX ja: <http://jena.hpl.hp.com/2005/11/Assembler#> |
| |
| tdb:Dataset a rdfs:Class . |
| tdb:GraphTDB a rdfs:Class . |
| |
| tdb:DatasetTDB rdfs:subClassOf ja:RDFDataset . |
| tdb:GraphTDB rdfs:subClassOf ja:Model . |
| |
| tdb:location a rdf:Property ; |
| # domain is tdb:Dataset or tdb:GraphTDB |
| # The range is simple literal |
| . |
| |
| tdb:unionDefaultGraph a rdf:Property ; |
| rdfs:domain tdb:Dataset ; |
| # The range is xsd:boolean |
| . |
| |
| tdb:graphName a rdf:Property ; |
| rdfs:domain tdb:GraphTDB ; |
| # range is a URI |
| . |
| </code></pre> |
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