Hi All, I'm Dileepa, a software developer currently working in a project involving semantic web and linked data technologies. We are using Marmotta for linked data publishing and querying purposes in the project. In the client side, to query linked data we are using anno4j <https://github.com/anno4j/anno4j> a Java RDF library conforming to open annotation data model which supports LDPath to do data querying.
Following is a sample SPARQL query I'm trying to wrap with anno4j using LDPath. PREFIX skos: <http://www.w3.org/2004/02/skos/core#> PREFIX mico: <http://www.mico-project.eu/ns/platform/1.0/schema#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX oa: <http://www.w3.org/ns/oa#> PREFIX dc: <http://purl.org/dc/elements/1.1/> PREFIX dct: <http://purl.org/dc/terms/> PREFIX fam: <http://vocab.fusepool.info/fam#> PREFIX dbo: <http://dbpedia.org/ontology/> SELECT ?id ?body ?p ?o WHERE { <http://localhost:8080/43s5-3356-53fd-e338f4653aad> mico:hasContentPart ?cp . ?cp mico:hasContent ?annot . ?annot oa:hasBody ?body . ?body ?p ?o FILTER EXISTS {?body rdf:type fam:LinkedEntity} FILTER NOT EXISTS {?body fam:entity-type skos:Concept } I can map FILTER EXISTS using: oa:hasBody[is-a fam:LinkedEntity] or oa:hasBody[rdf:type is fam:LinkedEntity] But I'm having difficulty with the negation filter. Any tips on how to map with SPARQL negation using LDPath? Thanks, Dileepa
