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POI cannot access an object property
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  1. POI cannot access an object property
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    copied!<p>I'm using Java and Jena API. I have a <strong><em>class Marriage</em></strong> which have 3 Object Properties called "<strong>hasHusband</strong>", "<strong>Haswife</strong>" and "<strong>dateOfMarriage</strong>". The first two are associated with a <strong><em>class Person</em></strong> which has the datatypeproperties like <strong>hasFirstName</strong>, <strong>hasLastName</strong>, <strong>dateOfBirth</strong>....</p> <p>I'd like to access the objects properties "Haswife" and "hasHusband" and then the wife's first name and the husband's first name.</p> <p><strong>Here is how that is represented in my rdf file:</strong></p> <p>(...)</p> <pre><code> &lt;j.0:FAMmariage rdf:about=http://www.fam.com/FAM#BrunoCatherine&gt; &lt;j.0:FAMaDateMariage&gt;25/07/2011&lt;/j.0:FAMaDateMariage&gt; &lt;j.0:FAMhasWife&gt; &lt;rdf:Description rdf:about="http://www.fam.com/FAM#Catherine20/03/1982"&gt; &lt;j.0:FAMDateOfBirth&gt;20/03/1980&lt;/j.0:FAMDateOfBirth&gt; &lt;j.0:FAMHasName&gt;Gomez&lt;/j.0:FAMHasName&gt; &lt;j.0:FAMHasFirstName&gt;Catherine&lt;/j.0:FAMHasFirstName&gt; &lt;/rdf:Description&gt; &lt;/j.0:FAMHasWife&gt; &lt;j.0:FAMHusband&gt; &lt;rdf:Description rdf:about="http://www.fam.com/FAM# Bruno15/06/1980 "&gt; &lt;j.0:FAMaDateOfBirth&gt;15/06/1980 &lt;/j.0:FAMDateOfBirth&gt; &lt;j.0:FAMHasName&gt;Jeandet &lt;/j.0:FAMHasName&gt; &lt;j.0:FAMHasFirstName&gt;Bruno&lt;/j.0:FAMHasFirstName&gt; &lt;/rdf:Description&gt; &lt;/j.0:FAMHusband&gt; &lt;/j.0:FAMmariage&gt; (...) </code></pre> <p><strong>I tried like this but it still does not works:</strong></p> <pre><code>StmtIterator iter = onto.model.listStatements(); while (iter.hasNext()) { Statement stmt = iter.nextStatement(); Resource subject = stmt.getSubject(); Property predicate = stmt.getPredicate(); RDFNode object = stmt.getObject(); if (predicate.equals(onto.hasWife)) { System.out.print(" " + object.toString() + " "); } } </code></pre> <p>Can you please tell me what's wrong?</p> <p>Thanks</p> <p><strong>EDITED</strong></p> <p>More useful details:</p> <p>(...)</p> <pre><code>person = model.createClass(uriBase+"person"); person.addSubClass(man); person.addSubClass(woman); marriage = model.createClass(uriBase+"marriage"); </code></pre> <p>(...)</p> <pre><code>hasHusband = model.createObjectProperty(uriBase+"hasHusband"); hasHusband.setDomain(marriage); hasHusband.setRange(man); hasWife = model.createObjectProperty(uriBase+"hasWife"); hasWife.setDomain(marriage); hasWife.setRange(woman); hasFirstName = model.createDatatypeProperty(uriBase+"hasFirstName"); hasFirstName.setDomain(person); hasFirstName.setRange(XSD.xstring); </code></pre> <p>(...)</p>
 

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