Deriving a VoID Linkset view of an SPO Balance

What is first

• Vocabulary of Interlinked Data: http://www.w3.org/TR/void
• SPO Balance

What we will cover

This page describes how to compute a VoID Linkset description of the Named Graphs summarized by SPO Balance.

What is next

• VoID Linkset views can be arranged using Centrifuge graph layout algorithm.

VoIDLinksetsFromSPOBalance.java uses ResourcesInSPOBalanceNamedGraphs.java (which implements linksets-from-bal.rq)

         ResourcesInSPOBalanceNamedGraphs querylet = new ResourcesInSPOBalanceNamedGraphs(null, pmap);
         QueryletProcessor.processQuery(this.specimenRepository, querylet);
         
         for( Resource dataset : querylet.get().keySet() ) {
            conn.add(dataset, RDF.type, VoID.DATASET,                                       reportR);
            for( Resource dataset2 : querylet.get().keySet() ) {
               conn.add(dataset2, RDF.type, VoID.DATASET,                                   reportR);
               if( !dataset2.equals(dataset) ) {
                  Set<URI> intersection = new HashSet<URI>();
                  intersection.addAll(   querylet.get().get(dataset));
                  intersection.retainAll(querylet.get().get(dataset2));
                  
                  if( intersection.size() > 1 ) {
                     Resource linkset = vf.createBNode();
                     conn.add(dataset, VoID.subset,  linkset,                               reportR);
                     conn.add(linkset, RDF.type,     VoID.Linkset,                          reportR);
                     conn.add(linkset, VoID.target,  dataset,                               reportR);
                     conn.add(linkset, VoID.target,  dataset2,                              reportR);
                     conn.add(linkset, VoID.triples, vf.createLiteral(intersection.size()), reportR);
                  }
               }
            }
            conn.commit();
         }

produces:

<.../http_ieeevis_tw_rpi_edu_lam-2012-evaluations-2-categories/spo>
    void:subset [
        void:target <.../http_ieeevis_tw_rpi_edu_lam-2012-evaluations-2-categories/spo>,
          <.../http_ieeevis_tw_rpi_edu_source_ieeevis-tw-rpi-edu_dataset_vsr-semantic-graphic-search_version_2013-Apr-02_ac4615b3ef1eed5c66fe07f3b10d66f8/spo> ;
        void:triples "1152"^^xsd:int ;
        a void:Linkset
    ], [
        void:target <.../http_ieeevis_tw_rpi_edu_lam-2012-evaluations-2-categories/spo>, 
<.../http_ieeevis_tw_rpi_edu_source_datahub_io_dataset_vis-evaluation-methods-in-2005-2007-infovis-and-2006-2007-vast-papers_version_2013-Mar-22/spo> ;
        void:triples "114"^^xsd:int ;
        a void:Linkset
    ],

What is next

• VoID Linkset information can be Centrifuged to get a graph layout.