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| <h1 class="title">TDB Dynamic Datasets</h1> |
| |
| <p><em>TDB version 0.8.5 and later</em></p> |
| <p>This feature allows a query to be made on a subset of all the named |
| graphs in the TDB storage datasets. The SPARQL <code>GRAPH</code> pattern |
| allows access to either a specific named graph or to all the named |
| graph in a dataset. This feature means that only specified named |
| graphs are visible to the query.</p> |
| <p>SPARQL has the concept of a |
| <a href="http://www.w3.org/TR/sparql11-query/#specifyingDataset">dataset description</a>. |
| In a query string, the clauses for FROM and FROM NAMED specify the |
| dataset. The FROM clauses define the graphs that are merged to form |
| the default graph, and the FROM NAMED clauses identify the graphs |
| to be included as named graphs.</p> |
| <p>Normally, ARQ interprets these as coming from the web; the |
| graphs are read using HTTP GET. TDB modifies this behaviour; instead |
| of the universe of graphs being the web, the universe of graphs is |
| the TDB data store. FROM and FROM NAMED describe a dataset with |
| graphs drawn only from the TDB data store.</p> |
| <ul> |
| <li>Using one or more FROM clauses, causes the default graph of the |
| dataset to be the union of those graphs.</li> |
| <li>Using one or more FROM NAMED, with no FROM in a query, |
| causes an empty graph to be used for the default graph.</li> |
| <li>Using one or more FROM NAMED, with no FROM in a query, where the symbol |
| <a href="configuration.html"><code>TDB.symUnionDefaultGraph</code></a> |
| is also set, causes the default graph to be the set union of all the named |
| graphs (FROM NAMED).</li> |
| </ul> |
| <p>Example</p> |
| <pre><code>#Follow a foaf:knows path across both Alice and Bobs FOAF data |
| #where the data is in the datastore as named graphs. |
| |
| BASE <http://example> |
| SELECT ?zName |
| FROM <alice-foaf> |
| FROM <bob-foaf> |
| { |
| <http://example/Alice#me> foaf:knows ?y . |
| ?y foaf:knows ?z . |
| ?z foaf:name ?zName . |
| } |
| </code></pre> |
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