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| <h1 class="title">TriX support in Apache Jena</h1> |
| |
| <p>Jena supports <a href="http://www.hpl.hp.com/techreports/2004/HPL-2004-56.html">TriX</a>, a |
| simple XML format for RDF, for both reading and writing RDF data.</p> |
| <p>The support is of the TriX core, without processing instructions.</p> |
| <p>Both the original HPlabs and W3C DTDs are supported for reading. Writing is |
| according to the W3C DTD, that is using root element <code><trix></code>, |
| rather than <code><TriX></code>.</p> |
| <p>Note: This format should not be confused with RDF/XML, the W3C standardised XML |
| format for RDF.</p> |
| <h3 id="trix-history">TriX History</h3> |
| <p>TriX originated from work by Jeremy Carroll (then at HP Labs, Bristol) and Patrick |
| Stickler (then at Nokia) and published as a tech report |
| <a href="https://www.hpl.hp.com/techreports/2004/HPL-2004-56.html">HPL-2004-56</a> |
| There is also earlier work published in <a href="https://www.hpl.hp.com/techreports/2003/HPL-2003-268.html">HPL-2003-268</a>.</p> |
| <p>The work within the Semantic Web Interest Group on Named Graphs, including TriX, |
| is documented at <a href="https://www.w3.org/2004/03/trix/">https://www.w3.org/2004/03/trix/</a>.</p> |
| <p>TriX DTD: <a href="http://www.w3.org/2004/03/trix/trix-1/trix-1.0.dtd">http://www.w3.org/2004/03/trix/trix-1/trix-1.0.dtd</a><br/> |
| Trix XML Schema: <a href="http://www.w3.org/2004/03/trix/trix-1/trix-1.0.xsd">http://www.w3.org/2004/03/trix/trix-1/trix-1.0.xsd</a></p> |
| <p>The <a href="https://www.w3.org/2004/03/trix/trix-1/trix-1.0.dtd">W3C DTD</a> differs from |
| HPL-2004-56 by having root element <code><trix></code> not <code><TriX></code>.</p> |
| <pre><code><!-- TriX: RDF Triples in XML --> |
| <!ELEMENT trix (graph*)> |
| <!ATTLIST trix xmlns CDATA #FIXED "http://www.w3.org/2004/03/trix/trix-1/"> |
| <!ELEMENT graph (uri, triple*)> |
| <!ELEMENT triple ((id|uri|plainLiteral|typedLiteral), uri, (id|uri|plainLiteral|typedLiteral))> |
| <!ELEMENT id (#PCDATA)> |
| <!ELEMENT uri (#PCDATA)> |
| <!ELEMENT plainLiteral (#PCDATA)> |
| <!ATTLIST plainLiteral xml:lang CDATA #IMPLIED> |
| <!ELEMENT typedLiteral (#PCDATA)> |
| <!ATTLIST typedLiteral datatype CDATA #REQUIRED> |
| </code></pre><h3 id="trix-star">TriX-star</h3> |
| <p>The format is extended for <a href="https://w3c.github.io/rdf-star/">RDF-star</a> with |
| embedded triples by allowing nested <code><triple></code>.</p> |
| <p>Trix-star (2021) adds ‘triple’ to subject and object positions |
| of <code>ELEMENT triple</code>.</p> |
| <pre><code><!ELEMENT triple ((id|uri|plainLiteral|typedLiteral|triple), uri, (id|uri|plainLiteral|typedLiteral|triple))> |
| </code></pre><h4 id="example">Example</h4> |
| <p>The Turtle:</p> |
| <pre><code>PREFIX : <http://example/> |
| |
| :s :p "ABC" . |
| << :s :p :o >> :q :r . |
| </code></pre><p>is written in Trix as:</p> |
| <pre><code><trix xmlns="http://www.w3.org/2004/03/trix/trix-1/"> |
| <graph> |
| <triple> |
| <uri>http://example/s</uri> |
| <uri>http://example/p</uri> |
| <plainLiteral>ABC</plainLiteral> |
| </triple> |
| <triple> |
| <triple> |
| <uri>http://example/s</uri> |
| <uri>http://example/p</uri> |
| <uri>http://example/o</uri> |
| </triple> |
| <uri>http://example/q</uri> |
| <uri>http://example/r</uri> |
| </triple> |
| </graph> |
| </trix> |
| </code></pre> |
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