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POSPARQL: How to get an insance of an ontology, if depth of the class hierarchy is unknown?
 

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  1. POSPARQL: How to get an insance of an ontology, if depth of the class hierarchy is unknown?
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    <p>I have a question about SPARQL. I have an ontology of animals:</p> <pre><code>Animals (is a superclass with object property &lt;hasColor&gt;) ------ Mammals (subclass of Animals) ------------- Dog (subclass of Mammals) ---------------- dog1 (a instance with property &lt;hasColor&gt;="white") ---------------- dog2 (a instance with property &lt;hasColor&gt;="red" ) ------ Bird (subclass of Animals) </code></pre> <p><strong>Is it possible to find with SPARQL "all Animals, that are 'white' " or "all instances of Animals"? And backwards: How can I know, if a instance (dog1) belongs to Animals?</strong></p> <p><strong>NOTE</strong>: The depth and breadth of the class hierarchy is unknown in advance.</p> <p>Also the query below will not work </p> <pre><code>SELECT ?x WHERE {?x rdfs:subClassOf :Animals . ?x :hasСolor "white"} </code></pre> <p>And the next query (find all Animals, that are 'white') works only if the depth of class hierarchy is known. (So if the hierarchy is known, can I make the specified steps (from top of hierarchy to bottom) to reach the goal: in this case 2 steps.</p> <pre><code>SELECT ?z WHERE { ?x rdfs:subClassOf :Animals . ?y rdfs:subClassOf ?x . ?z rdf:type ?y . ?z :hasColor "white" } </code></pre> <p>The same is true for the next example - "find all instances of Animals"</p> <pre><code>SELECT ?z WHERE { ?x rdfs:subClassOf :Animals . ?y rdfs:subClassOf ?x . ?z rdf:type ?y . } </code></pre> <p>What to do, if the hierarchie is unknown?</p> <p>The query will be processed with <strong>SDB</strong> (is a component of <strong>Jena</strong>).</p> <p>I want something like : <code>select ?x where {?x rdfs:subClassOf :Animals . ?x :hasСolor "white"})</code></p> <p><strong>UPD.</strong> Solution for "find all Animals (instances), that are 'white'" might look like this:</p> <blockquote> <p>SELECT ?y WHERE { ?x rdfs:subClassOf* :Animals . ?y rdf:type ?x . ?y :hasColor "white"}</p> </blockquote>
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