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| <h1 class="title">Apache Jena ShEx</h1> |
| |
| <p><code>jena-shex</code> is an implementation of the |
| <a href="https://shex.io">ShEx (Shape Expressions)</a> language.</p> |
| <p> |
| <i>This implementation is experimental, starting with Jena 4.2.0. |
| Please send usage reports and experience to </i> |
| <tt>users@jena.apache.org</tt>. |
| </p> |
| <h2 id="status">Status</h2> |
| <p><code>jena-shex</code> reads ShExC (the compact syntax) files.</p> |
| <p>Not currently supported:</p> |
| <ul> |
| <li>semantic actions</li> |
| <li><code>EXTERNAL</code></li> |
| </ul> |
| <p>Blank node label validation is meaningless in Jena because a blank node label is |
| scoped to the file, and not retained after the file has been read.</p> |
| <h2 id="command-line">Command line</h2> |
| <p>The command <code>shex</code> introduces shex operations; it takes a sub-command |
| argument.</p> |
| <p>To validate:</p> |
| <pre>shex validate --schema SCHEMA.shex --map MAP.shexmap --data DATA.ttl</pre> |
| <pre>shex v -s SCHEMA.shex -m MAp.shexmap -d data.ttl</pre> |
| <p>To parse a file:</p> |
| <pre>shex parse <i>FILE</i></pre> |
| <pre>shex p <i>FILE</i></pre> |
| <p>which writes out the parser results in a text format.</p> |
| <!-- |
| <pre>shex p <i>--out=FMT</i> <i>FILE</i></pre> |
| writes out in `text`(`t`), `compact`(`c`), `rdf`(`r`) formats. Multiple formats |
| can be given, separated by "," and format `all` outputs all 3 formats. |
| --> |
| <h2 id="api">API</h2> |
| <p>The package <code>org.apache.jena.shex</code> has the main classes.</p> |
| <ul> |
| <li><code>Shex</code> for reading ShEx related formats.</li> |
| <li><code>ShexValidation</code> for validation.</li> |
| </ul> |
| <h2 id="api-examples">API Examples</h2> |
| <p>Examples:</p> |
| <p><a href="https://github.com/apache/jena/tree/main/jena-examples/src/main/java/shex/examples/">https://github.com/apache/jena/tree/main/jena-examples/src/main/java/shex/examples/</a></p> |
| <pre><code> public static void main(String ...args) { |
| String SHAPES = "examples/schema.shex"; |
| String SHAPES_MAP = "examples/shape-map.shexmap"; |
| String DATA = "examples/data.ttl"; |
| |
| System.out.println("Read data"); |
| Graph dataGraph = RDFDataMgr.loadGraph(DATA); |
| |
| System.out.println("Read schema"); |
| ShexSchema shapes = Shex.readSchema(SHAPES); |
| |
| // Shapes map. |
| System.out.println("Read shapes map"); |
| ShexMap shapeMap = Shex.readShapeMap(SHAPES_MAP); |
| |
| // ShexReport |
| System.out.println("Validate"); |
| ShexReport report = ShexValidator.get().validate(dataGraph, shapes, shapeMap); |
| |
| System.out.println(); |
| // Print report. |
| ShexLib.printReport(report); |
| } |
| </code></pre> |
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