semantic-web

问题 I want to store tuples {a implies c, not c,...} . How do I reference the operators? Is there a specific vocabulary I should use? edited after first comment 来源： https://stackoverflow.com/questions/38776523/referencing-logical-operators

问题 I'm wondering if we can know whether two resources have the same category or some subcategory (i.e., belong to categories of some common supercategory) in DBpedia? I tried this query in the DBpedia endpoint but it's wrong: select distinct ?s ?s2 where { ?s skos:subject <http :// dbpedia.org/resource/ Category ?c. ?s2 skos:subject <http :// dbpedia.org/resource/ Category ?c2. ?c=?c2. } 回答1: DBpedia doesn't use skos:subject for resources, but rather relates resources to their Wikipedia

问题 For a project I have to use Apache Jena as an API and Blazegraph as a triple store, I am trying to program a code that allows me to transform my dataset (N-Triples File) to a file that contains the NamedGraph of each statement. String APIUrl = "http://localhost:9999/bigdata/namespace/drugbank/sparql"; String req = "select * WHERE {?x ?y ?z}"; RDFConnection conn = RDFConnectionFactory.connect(APIUrl); FileManager.get().addLocatorClassLoader(Main.class.getClassLoader()); Model model =

问题 These settings were working with fuseki 2.0, now i am on fuseki 2.3, but these settings not working any more: [] rdf:type fuseki:Server ; fuseki:services ( <#serviceInMemoryWithReasoner> ) . <#serviceInMemoryWithReasoner> rdf:type fuseki:Service; rdfs:label "testdataset"; fuseki:name "testdataset"; fuseki:serviceQuery "query"; fuseki:serviceUpdate "update"; fuseki:dataset <#datasetServiceInMemoryWithReasoner> ; . <#datasetServiceInMemoryWithReasoner> rdf:type ja:RDFDataset; ja:defaultGraph <

问题 I have a specific instance and a SPARQL query that retrieves other instances similar to that one. By similar, I mean that the other instances have at least one common property and value in common with the specific instance, or have a class in common with the specific instance. Now, I'd like to extend the query such that if the specific instance has a value for a "critical" property, then the only instances that are considered similar are those that also have that critical property (as opposed

问题 To get movie detail from linkedmdb, I used sparql query : PREFIX mdb: <http://data.linkedmdb.org/resource/movie/film> SELECT DISTINCT ?Title ?Genre ?Actor ?Country ?Director ?Year WHERE { ?film mdb:id ?uri . ?film dc:title ?Title . ?film movie:genre ?filmgenre. ?filmgenre movie:film_genre_name ?Genre . ?film movie:actor ?cast . ?cast movie:actor_name ?Actor . ?film movie:country ?Ctr . ?Ctr movie:country_name ?Country . ?film dc:date ?Year . ?film movie:director ?Drc . ?Drc movie:director

问题 Given are Objects :A, :B and :C which have properties assigned, whereas these properties are not scalar themselves but are also objects with key and value properties. @prefix x: <http://example.com/example#> x:A x:hasProp x:Prop1 . x:Prop1 x:Key "1" . x:Prop1 x:Value "AA" . x:B x:hasProp x:Prop2 . x:Prop2 x:Key "1" . x:Prop2 x:Value "AA" . x:C x:hasProp x:Prop3 . x:C x:hasProp x:Prop4 . x:Prop3 x:Key "1" . x:Prop3 x:Value "AA" . x:Prop4 x:Key "2" . x:Prop4 x:Value "BB" . How can I assert that

问题 I have two ontologies which i join them together in one big ontology This is in the big ontology <!-- http://www.MusicSemanticOntology/mso#r1 --> <owl:NamedIndividual rdf:about="http://www.MusicSemanticOntology/mso#r1"> <rdf:type rdf:resource="http://semanticrecommender.com/rs#Rates"/> <rs:about rdf:resource="http://music.org/musicontology/mo#5th_Symphony"/> <rs:createdOn rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">1956-06-25T04:00:00-05:00</rs:createdOn> <rs:ratesBy rdf:datatype

问题 I have done a family tree. I also defined transitive property: childOf. Now I want to make SPARQL Query which give me all descendants of one of members of family. How can I do it? Thanks 回答1: If your triple store supports OWL reasoning and you've defined your childOf property to be transitive (shouldn't it be called descendantOf by the way!), then it should infer childOf properties directly between all related nodes. So, it should be enough to query it like this (prefixes omitted for brevity)

问题 In short, if someone instructs me, "Get a list of databases which include Oracle, Mysql, DB2, MSSQL, etc.," how can I actually establish which fields and information I need to create the query? I downloaded DBpedia and grepped the triples, e.g., $ `grep 'Oracle' * | grep 'Database' article_categories_en.nt:<http://dbpedia.org/resource/Oracle_Database> <http://purl.org/dc/terms/subject> <http://dbpedia.org/resource/Category:Relational_database_management_systems> .` How do I create a SPARQL