@prefix foaf: . @prefix ns1: . @prefix ns2: . ns1:axel-polleres foaf:made ns2:iswc-2018-poster_and_demo-366 . ns1:david-martin foaf:made ns2:iswc-2018-poster_and_demo-366 . ns1:peter-patel-schneider foaf:made ns2:iswc-2018-poster_and_demo-366 . @prefix ns3: . @prefix ns4: . ns4:proceedings ns3:hasPart ns2:iswc-2018-poster_and_demo-366 . @prefix rdf: . ns2:iswc-2018-poster_and_demo-366 rdf:type ns3:InProceedings . @prefix rdfs: . ns2:iswc-2018-poster_and_demo-366 rdfs:label "Fixing Comparative Preferences for SPARQL" . @prefix dc: . ns2:iswc-2018-poster_and_demo-366 dc:creator ns1:david-martin , ns1:peter-patel-schneider , ns1:axel-polleres ; ns3:abstract "Sometimes one does not want all the solutions to a query but instead only\nthose that are most desirable according to user-specified preferences. If a\nuser-specified preference relation is acyclic then its specification and\nmeaning are straightforward. In many settings, however, it is valuable to\nsupport preference relations that are not acyclic. We discuss a definition\nof desired solutions for arbitrary preference relations and show its\ndesirable properties. We modify a previous extension to SPARQL to correctly\nhandle any preference relation. We also propose an additional extension\nthat returns solutions at multiple levels of desirability.\n" . @prefix ns8: . ns2:iswc-2018-poster_and_demo-366 ns3:hasAuthorList ns8:iswc-2018-poster_and_demo-366 ; ns3:isPartOf ns4:proceedings . @prefix xsd: . ns2:iswc-2018-poster_and_demo-366 ns3:keyword "SPARQL"^^xsd:string , "Cyclic preferences"^^xsd:string , "Preferences"^^xsd:string ; ns3:title "Fixing Comparative Preferences for SPARQL" . @prefix ns10: . ns10:iswc2018-author-axel-polleres-iswc-2018-poster_and_demo-366 ns3:withDocument ns2:iswc-2018-poster_and_demo-366 . ns10:iswc2018-author-david-martin-iswc-2018-poster_and_demo-366 ns3:withDocument ns2:iswc-2018-poster_and_demo-366 . ns10:iswc2018-author-peter-patel-schneider-iswc-2018-poster_and_demo-366 ns3:withDocument ns2:iswc-2018-poster_and_demo-366 .