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POCalculating the distance between two resources of DBPedia in JENA
 

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  1. POCalculating the distance between two resources of DBPedia in JENA
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    <p>I'm trying to calculate the distance (number of the edges in the DBpedia'graph) between two resources that I receive after querying DBpedia. For example: </p> <pre><code> Query query = QueryFactory.create(sparqlQueryString); QueryExecution qexec =QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql",query); try{ ResultSet results = qexec.execSelect(); for(; results.hasNext();) { QuerySolution soln = results.nextSolution(); for(int i=0;i&lt;solutionConcept.length;i++){ System.out.print(solutionConcept[i]+":"+soln.get(solutionConcept[i]).toString() +"; "); } System.out.println("\n"); } } finally{ qexec.close(); </code></pre> <p>and this is the string query:</p> <pre><code>String s6= "PREFIX rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; "+ "PREFIX rdfs: &lt;http://www.w3.org/2000/01/rdf-schema#&gt; "+ "PREFIX dbpedia: &lt;http://dbpedia.org/resource/&gt; "+ "PREFIX o: &lt;http://dbpedia.org/ontology/&gt; "+ "PREFIX dbprop: &lt;http://dbpedia.org/property/&gt;"+ "PREFIX xsd: &lt;http://www.w3.org/2001/XMLSchema#&gt;" + "select ?Player ?nation ?club "+ "where {?Player rdf:type o:SoccerPlayer; dbprop:birthPlace ?nation; dbprop:currentclub ?club.} LIMIT 10"; </code></pre> <p>well, is there a way to calculate the number of the edges ( the path??) between two players, or two nation , or two club???? Thank you very much...</p>
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    1. CODo you mean a path of certain properties, or of any properties, or what? If you're looking for a path, all of whose edges are drawn from set of properties, you may be able to do this, but if you're just looking for arbitrary paths, I don't think you'll be able to do this. Can you given a (manually constructed) example of the kind of result that you're looking for, based on the data that you have (or can browse on DBpedia)?
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      1. USJoshua Taylor
    2. COEssentially I would like to calculate the similarity between two resource..For example, supposing that this is my result set PLAYER NATION CLUB Arturo Vidal Chile Juventus// Claudio pizarro Chile Fiorentina I want to calculate the similarity between Vidal-Pizarro Chile Chile Juventus-Fiorentina And then calculating the total similarity
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    3. COI gathered that that is your intent. However, you need to specify _how_ you want to compute this before anyone can tell you whether you _can_ compute this. In OWL, everything is an instance of `owl:Thing`, so there's always a path of length two between any two resources: `rdf:type/^rdf:type`. But there will be other paths two. And some relationships indicate dissimilarity rather than similarity. Will you attempt to exclude those relations? To answer this question, more information is needed about _what_ you're trying to compute.
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      1. USJoshua Taylor
 

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