dbpedia

问题 I'm using Protege to develop an ontology that will include some things that are already described in DBpedia. Let's say I want to include a class 'Cities' and have 'Berlin' as an individual. My Berlin will have some properties the DBpedia Berlin doesn't but otherwise I'd like to 'reuse' DBpedia's Berlin. Do I need to define my own Berlin and then use rdf:seeAlso or can I somehow import DBpedia's Berlin and add some properties? 回答1: Just use the DBpedia IRI, If it's sufficient to simply talk

问题 I am having trouble executing SPARQL queries against dbpedia.org using Jena. The queries are of the form: PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX p: <http://dbpedia.org/property/> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?album ?name ?dateofrelease WHERE { ?album p:artist <http://dbpedia.org/resource/SomeArtist> . ?album rdf:type <http://dbpedia.org/ontology/Album> . ?album rdf:type <http://schema.org/MusicAlbum> . ?album p:name ?name . ?album <http:/

问题 I'm currently using the http://dbpedia.org/snorql website to launch some basic request like the one below: PREFIX dbpedia0: <http://dbpedia.org/ontology/> SELECT ?body ?value WHERE { ?body a dbpedia0:Person. ?body dbpedia0:birthDate ?value. } ORDER BY ?value I would like to find a way of filtering the results so that only people born on day X month Y are being selected (no matter the birth year). I have been trying to do so with many approaches like: 1) Basic filtering: FILTER(xsd:date(?value

问题 I want to get only the leaves a wikipedia category but not sure how. I can get all the leaves by SELECT ?subcat WHERE { ?subcat skos:broader* category:Buildings_and_structures_in_France_by_city . } This gives me all intermediate leaves (such as Category:Buildings_and_structures_in_Antibes) but I want to get just the last/bottom leaves of the tree. Leaves that can not be split anymore. How can I do this? 回答1: You should be able to simply filter out the values of ?subcat that are not terminal

问题 DBpedia offers a look up facility like http://lookup.dbpedia.org/api/search.asmx/KeywordSearch?QueryString=panda that returns a result set. Can the same result set be obtained by using SPARQL to query DBpedia 来源： https://stackoverflow.com/questions/15667133/dbpedia-sparql-search-similar-to-dbpedia-lookup-facility

问题 I get the following error. Virtuoso 22007 Error DT006: Cannot convert -0359 to datetime : Incorrect month field length SPARQL query: define sql:big-data-const 0 #output-format:text/html define sql:signal-void-variables 1 select ?item bif:year(xsd:dateTime( str(?dob))) as ?m{ ?item <h://f.cm/ns/common/topic/notable_types> <h://f.cm/ns/people/person> . ?item <h://f.cm/ns/people/person/date_of_birth> ?dob } limit 675 If I change the limit to 674 , it works. What I suspected was that some

问题 I have the SPARQL DBpedia Query below: PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX vrank:<http://purl.org/voc/vrank#> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> SELECT distinct ?Nom ?resource ?url (count( (?o) as ?nb)) WHERE{ ?resource rdfs:label ?Nom. ?resource foaf:isPrimaryTopicOf ?url. ?resource dbpedia-owl:wikiPageWikiLink ?o ?Nom <bif:contains> "Apple". FILTER ( langMatches( lang(?Nom), "EN" )). MINUS {?resource dbo

问题 I have the SPARQL DBpedia Query below: PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX vrank:<http://purl.org/voc/vrank#> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> SELECT distinct ?Nom ?resource ?url (count( (?o) as ?nb)) WHERE{ ?resource rdfs:label ?Nom. ?resource foaf:isPrimaryTopicOf ?url. ?resource dbpedia-owl:wikiPageWikiLink ?o ?Nom <bif:contains> "Apple". FILTER ( langMatches( lang(?Nom), "EN" )). MINUS {?resource dbo

问题 I created a SPARQL query that I'm running on the DBpedia SNORQL SPARQL endpoint. The purpose of the query is to get a list of universities or colleges in the United States, including their longitude, latitude, and endowment. The query seems to be working but seems to be missing some records and/or attributes. So, for example, Harvard University doesn't show up in the result, even though its DBpedia record exists and the attributes should match my query. I'm not sure why that record doesn't

问题 Does anyone know where to find a little how to on using dbpedia spotlight in java or scala? Or could anyone explain how it's done? I can't find any information on this... 回答1: The DBpedia Spotlight wiki pages would be a good place to start. And I believe the installation page has listed the most popular ways (using a jar, or set up a web service) to use the application. It includes instructions on using the Java/Scala API with your own installation, or calling the Web Service. There are some