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| <h1 class="title">Reification styles (archive material)</h1> |
| |
| <h2 id="reification-styles">Reification styles</h2> |
| <p>Prior to version 2.10.0 of Jena, there were 3 styles of reification, |
| “standard”, “minimal” and “convenient”. As of 2.10.0 and later, only |
| what was previously the “standard” style is supported.</p> |
| <p>By default and as you might expect, Jena models allow reification |
| quads to be manifested as <code>ReifiedStatement</code>s. Similarly, |
| explicitly created <code>ReifiedStatement</code>s are visible as statement |
| quads.</p> |
| <p>Sometimes, this is not desirable. For example, in an application |
| that reifies large numbers of statements in the same model as those |
| statements, most of the results from <code>listStatements()</code> will be |
| quadlets; this is inefficient and confusing. One choice is to reify |
| the statements in a <em>different</em> model. Another is to take advantage |
| of <em>reification styles</em>.</p> |
| <p>Each model has a reification style, described by constants in |
| <code>ModelFactory</code>. The default style is called <code>Standard</code> because it |
| behaves more closely to the RDF standard. There are two other |
| reification styles to choose from:</p> |
| <ul> |
| <li><code>Convenient</code>: reification quadlets are not visible in the |
| results of <code>listStatements)()</code>. Otherwise everything is normal; |
| quadlets that are added to the model contribute to |
| <code>ReifiedStatement</code> construction.</li> |
| <li><code>Minimal</code>: reification quadlets play no role at all in the |
| construction of <code>ReifiedStatement</code>s, which can only be created by |
| the methods discussed earlier. This style is most similar to that |
| of Jena 1.</li> |
| </ul> |
| <p>The method <code>ModelFactory.createDefaultModel()</code> takes an optional |
| <code>Style</code> argument, which defaults to <code>Standard</code>. Similarly, |
| <code>createFileModelMaker()</code> and <code>createMemModelMaker()</code> can take |
| <code>Style</code> arguments which are applied to every model they create. |
| To take a model with hidden reification quads and expose them as |
| statements, the method <code>ModelFactory.withHiddenStatements(Model m)</code> |
| produces a new model which does just that.</p> |
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