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| <h1 class="title">Jena assembler quickstart</h1> |
| |
| <p>Jena’s assembler provides a means of constructing Jena models |
| according to a recipe, where that recipe is itself stated in |
| RDF. This is the Assembler quickstart page. For more detailed |
| information, see the <a href="assembler-howto.html">Assembler howto</a> |
| or <a href="inside-assemblers.html">Inside assemblers</a>.</p> |
| <h2 id="what-is-an-assembler-specification">What is an Assembler specification?</h2> |
| <p>An Assembler <em>specification</em> is an RDF description of how to |
| construct a model and its associated resources, such as reasoners, |
| prefix mappings, and initial content. The Assembler vocabulary is |
| given in the <a href="assembler.ttl">Assembler schema</a>, |
| and we’ll use the prefix <code>ja</code> for its identifiers.</p> |
| <h2 id="what-is-an-assembler">What is an Assembler?</h2> |
| <p>An <em>Assembler</em> is an object that implements the <code>Assembler</code> |
| interface and can construct objects (typically models) from |
| Assembler specifications. The constant <code>Assembler.general</code> is an |
| Assembler that knows how to construct some general patterns |
| of model specification.</p> |
| <h2 id="how-can-i-make-a-model-according-to-a-specification">How can I make a model according to a specification?</h2> |
| <p>Suppose the Model <code>M</code> contains an Assembler specification whose |
| <em>root</em> - the Resource describing the whole Model to construct is |
| <code>R</code> (so <code>R.getModel() == M)</code>. Invoke:</p> |
| <pre><code>Assembler.general.openModel(R) |
| </code></pre> |
| <p>The result is the desired Model. Further details about the |
| <code>Assembler</code> interface, the special Assembler <code>general</code>, and the |
| details of specific Assemblers, are deferred to the |
| <a href="assembler-howto.html">Assembler howto</a>.</p> |
| <h2 id="how-can-i-specify-">How can I specify …</h2> |
| <p>In the remaining sections, the object we want to describe is given |
| the root resource <code>my:root</code>.</p> |
| <h3 id="-a-memory-model">… a memory model?</h3> |
| <pre><code>my:root a ja:MemoryModel. |
| </code></pre> |
| <h3 id="-an-inference-model">… an inference model?</h3> |
| <pre><code>my:root |
| ja:reasoner [ja:reasonerURL theReasonerURL] ; |
| ja:baseModel theBaseModelResource |
| . |
| </code></pre> |
| <p><em>theReasonerURL</em> is one of the reasoner (factory) URLs given in the |
| inference documentation and code; <em>theBaseModelResource</em> is another |
| resource in the same document describing the base model.</p> |
| <h3 id="-some-initialising-content">… some initialising content?</h3> |
| <pre><code>my:root |
| ja:content [ja:externalContent <someContentURL>] |
| ... rest of model specification ... |
| . |
| </code></pre> |
| <p>The model will be pre-loaded with the contents of <em>someContentURL</em>.</p> |
| <h3 id="-an-ontology-model">… an ontology model?</h3> |
| <pre><code>my:root |
| ja:ontModelSpec ja:OntModelSpecName ; |
| ja:baseModel somebaseModel |
| . |
| </code></pre> |
| <p>The <em>OntModelSpecName</em> can be any of the predefined Jena |
| OntModelSpec names, eg <code>OWL_DL_MEM_RULE_INF</code>. The baseModel is |
| another model description - it can be left out, in which case you |
| get an empty memory model. See |
| <a href="assembler-howto.html">Assembler howto</a> for construction of |
| non-predefined OntModelSpecs.</p> |
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