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| <h1 class="title">Data with RDFS Inferencing</h1> |
| |
| <p>This page describes support for accessing data with additional statements |
| derived using RDFS. It supports <code>rdfs:subClassOf</code>, <code>rdfs:subPropertyOf</code>, <code>rdfs:domain</code> and <code>rdfs:range</code>. It |
| does not provide RDF axioms. The RDFS vocabulary is not included in the data.</p> |
| <p>It does support use with RDF datasets, where each graph in the dataset has the |
| same RDFS vocabulary applied to it.</p> |
| <p>This is not a replacement for the <a href="/inference/">Jena RDFS Reasoner support</a> |
| which covers full RDFS inference.</p> |
| <p>The data is updateable, and graphs can be added and removed from the dataset. |
| The vocabulary can not be changed during the lifetime of the RDFS dataset.</p> |
| <h3 id="api-rdfsfactory">API: <code>RDFSFactory</code></h3> |
| <p>The API provides operation to build RDF-enabled datasets from data storage and vocabularies:</p> |
| <p>Example:</p> |
| <pre><code> DatasetGraph data = ... |
| // Load the vocabulary |
| Graph vocab = RDFDataMgr.loadGraph("vocabulary.ttl"); |
| // Create a DatasetGraph with RDFS |
| DatasetGraph dsg = datasetRDFS(DatasetGraph data, Graph vocab ); |
| // (Optional) Present as a Dataset. |
| Dataset dataset = DatasetFactory.wrap(dsg); |
| </code></pre><p>The vocabulary is processed to produce datastructure needed for processing the |
| data eficiently at run time. This is the <code>SetupRDFS</code> class that can be created |
| and shared; it is thread-safe.</p> |
| <pre><code> SetupRDFS setup = setupRDFS(vocab); |
| </code></pre><h3 id="assembler-rdfs-dataset">Assembler: RDFS Dataset</h3> |
| <p>Datasets with RDFS can be built with an assembler:</p> |
| <pre><code><#rdfsDS> rdf:type ja:DatasetRDFS ; |
| ja:rdfsSchema <vocabulary.ttl>; |
| ja:dataset <#baseDataset> ; |
| . |
| |
| <#baseDataset> rdf:type ...some dataset type ... ; |
| ... |
| . |
| </code></pre><p>where <code><#baseDataset></code> is the definition of the dataset to be enriched.</p> |
| <h3 id="assembler-rdfs-graph">Assembler: RDFS Graph</h3> |
| <p>It is possible to build a single <code>Model</code>:</p> |
| <pre><code> <#rdfsGraph> rdf:type ja:GraphRDFS ; |
| ja:rdfsSchema <vocabulary.ttl>; |
| ja:graph <#baseGraph> ; |
| . |
| |
| <#baseGraph> rdf:type ja:MemoryModel; |
| ... |
| </code></pre><p>More generally, inference models can be defined using the Jena Inference and Rule |
| engine: |
| <a href="https://github.com/apache/jena/tree/main/jena-fuseki2/examples/config-inference-1.ttl">jena-fuseki2/examples/config-inference-1.ttl</a>.</p> |
| <h2 id="use-with-fuseki">Use with Fuseki</h2> |
| <p>The files for this example are available at: |
| <a href="https://github.com/apache/jena/tree/main/jena-fuseki2/examples/rdfs">jena-fuseki2/examples/rdfs</a>.</p> |
| <p>From the command line (here, loading data from a file into an in-memory dataset):</p> |
| <pre><code>fuseki-server --data data.trig --rdfs vocabulary.ttl /dataset |
| </code></pre><p>or from a configuration file with an RDFS Dataset:</p> |
| <pre><code>PREFIX : <#> |
| PREFIX fuseki: <http://jena.apache.org/fuseki#> |
| 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#> |
| |
| [] rdf:type fuseki:Server ; |
| fuseki:services ( |
| :service |
| ) . |
| |
| ## Fuseki service /dataset with SPARQ query |
| ## /dataset?query= |
| :service rdf:type fuseki:Service ; |
| fuseki:name "dataset" ; |
| fuseki:endpoint [ fuseki:operation fuseki:query ] ; |
| fuseki:endpoint [ fuseki:operation fuseki:update ] ; |
| fuseki:dataset :rdfsDataset ; |
| . |
| |
| ## RDFS |
| :rdfsDataset rdf:type ja:DatasetRDFS ; |
| ja:rdfsSchema <file:vocabulary.ttl>; |
| ja:dataset :baseDataset; |
| . |
| |
| ## Transactional in-memory dataset. |
| :baseDataset rdf:type ja:MemoryDataset ; |
| ja:data <file:data.trig>; |
| . |
| </code></pre><h3 id="querying-the-fuseki-server">Querying the Fuseki server</h3> |
| <p>With the <a href="/documentation/fuseki2/soh.html">SOH</a> tools, a query (asking for plain |
| text output):</p> |
| <pre><code>s-query --service http://localhost:3030/dataset --output=text --file query.rq |
| </code></pre><p>or with <code>curl</code>:</p> |
| <pre><code>curl --data @query.rq \ |
| --header 'Accept: text/plain' \ |
| --header 'Content-type: application/sparql-query' \ |
| http://localhost:3030/dataset |
| </code></pre><p>will return:</p> |
| <pre><code>------------------------- |
| | s | p | o | |
| ========================= |
| | :s | ns:p | :o | |
| | :s | rdf:type | ns:D | |
| | :o | rdf:type | ns:T1 | |
| | :o | rdf:type | ns:T3 | |
| | :o | rdf:type | ns:T2 | |
| ------------------------- |
| </code></pre><h3 id="files">Files</h3> |
| <p>data.trig:</p> |
| <pre><code>PREFIX : <http://example/> |
| PREFIX ns: <http://example/ns#> |
| |
| :s ns:p :o . |
| </code></pre><p><code>vocabulary.ttl</code>:</p> |
| <pre><code>PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> |
| PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> |
| PREFIX skos: <http://www.w3.org/2008/05/skos#> |
| PREFIX list: <http://jena.hpl.hp.com/ARQ/list#> |
| |
| PREFIX ns: <http://example/ns#> |
| |
| ns:T1 rdfs:subClassOf ns:T2 . |
| ns:T2 rdfs:subClassOf ns:T3 . |
| |
| ns:p rdfs:domain ns:D . |
| ns:p rdfs:range ns:T1 . |
| </code></pre><p><code>query.rq</code>:</p> |
| <pre><code>PREFIX : <http://example/> |
| PREFIX ns: <http://example/ns#> |
| PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> |
| |
| SELECT * { ?s ?p ?o } |
| </code></pre> |
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