sparql

问题 I want to perform the following queries, to add a relation skos:related between node a and node b : PREFIX skos:<http://www.w3.org/2004/02/skos/core#> INSERT { GRAPH ?graph { ?a skos:related ?b } } WHERE{ GRAPH ?graph { { ?a skos:inScheme ?scheme } . { ?b skos:inScheme ?scheme } } }; INSERT { GRAPH ?graph { ?b skos:related ?a } } WHERE{ GRAPH ?graph { { ?a skos:inScheme ?scheme } . { ?b skos:inScheme ?scheme } } }; I would prefer to send a single query to the RDF store, but can't find a way

问题 I have simple ontology called "campus.owl".There is a class called"Lecturer" and which has two sub classes ,RegularLecturer and VisitingLecturer.There is a another class called "Student" which is a sibling class of Lecturer class. I have created individuals for all the classes. Student class is joind with Lecture class with "has" object property. problem I want to get some Lecturer/VisitingLecturer individuals for given student individual. Could you please help me to get this result! Thanks

问题 I'm using TopBraid as IDE and Jena in Java. For the same SPARQL query and same file, I'm getting two different result sets. The ontology can be found here, https://dl.dropboxusercontent.com/u/108022472/ontology.owl The SPARQL is: select ?individual ?type ?label where { ?individual rdf:type ?type . ?individual rdfs:label ?label filter (?type in (wo:Kingdom)) } My Java Code: public class ExeSparql { static String prefix = "PREFIX owl: <http://www.w3.org/2002/07/owl#> " + "PREFIX xsd: <http:/

问题 I am intrigued by Using Property Chains to get inferred Knowledge in an OWL Ontology(Protege) The accepted answer has two solutions: two OWL expressions, or a SWRL rule. I get the sense that the OP found the all-OWL (property chain) solution confusing but was satisfied with the SWRL answer. I am trying to implement the all-OWL solution. So far, I don't see an inference that Steven_Gerrard is employed by England when reasoning with Pellet . I do see the inference Steven_Gerrard R

问题 When I query the SPARQL endpoint for marklogic, I am trying to specify the optimize option: /v1/graphs/sparql?options=optimize%3D2 This results in a 400 error: REST-INVALIDPARAM: (err:FOER0000) Invalid parameter: No configured options: optimize=2" What is the correct syntax to specify this and other options? Related: How can I optimize a SPARQL query that returns optional properties? 回答1: See reference for GET /v1/graphs/sparql. There is an "optimize" parameter you can specify. For example:

问题 I am trying to query the skos:broader property for the DBPedia category "Diseases_of_oral_cavity,_salivary_glands_and_jaws". This category is available at the following URI: http://dbpedia.org/resource/Category:Diseases_of_oral_cavity,_salivary_glands_and_jaws The following query provides the desired output: PREFIX skos: <http://www.w3.org/2004/02/skos/core#> SELECT ?broaderCategory WHERE { <http://dbpedia.org/resource/Category:Diseases_of_oral_cavity,_salivary_glands_and_jaws> skos:broader

问题 I'm using SPARQL-DL with OWL-API in a Java application. The Maven dependency is the following: <dependency> <groupId>edu.stanford.protege</groupId> <artifactId>de-derivo-sparqldlapi</artifactId> <version>2.0.0</version> </dependency> I assume it downloads the right (compatible) version of OWL-API. I have a class Person with some individuals. Each individual has a data property called name which ranges over a string. By running this query: SELECT ?x WHERE { PropertyValue(?y, my:name, ?x) } I

问题 I'm trying to build a query that returns events that have two named participants. The names of these participants are specified using values for the first name and last name. So far, this is the only working solution I have been able to come up with: SELECT ?event WHERE { ?event con:hasParticipant ?personA . ?personA con:hasFirstName "Bob"^^xsd:string . ?personA con:hasLastName "Smith"^^xsd:string . ?event con:hasParticipant ?personB . ?personB con:hasFirstName "The"^^xsd:string . ?personB

问题 Is there a way to query both DBPedia and Wikidata at the same time? Like any way to query all the people in DBPedia and Wikidata at the same time? PREFIX wd: <http://www.wikidata.org/entity/> PREFIX wdt: <http://www.wikidata.org/prop/direct/> PREFIX dbo: <http://dbpedia.org/ontology/> { SELECT ?person WHERE { ?person wdt:P31 wd:Q5 } limit 100 } UNION { SELECT * { ?person a dbo:Person } } Try here 回答1: Thanks to @AKSW I got the answer to my question. The Federated SPARQL queries would do the

问题 PREFIX ex: <http://www.semanticweb.org/caeleanb/ontologies/twittermap#> PREFIX dbo: <http://dbpedia.org/ontology/> SELECT ?name (STR(?name) AS ?strip_name) ?name2 WHERE { ?p ex:displayName ?name2 . SERVICE <http://dbpedia.org/sparql> { { ?s rdfs:label ?name . ?s rdf:type foaf:Person . } UNION { ?x rdfs:label ?name . ?x dbo:wikiPageRedirects ?s . } } FILTER(STR(?name) = ?name2) . } This is the SPARQL query that I am sending to my Stardog SPARQL endpoint (hosted locally). I know a bunch of the