rdf

问题 I'm new to SPARQL and RDF. Bascially I have to design federated SPARQL 1.1 query over Wikidata and Dbpedia. Here's my simple query. This will select the films starring Leonardo Di Caprio. PREFIX wd: <http://www.wikidata.org/entity/> PREFIX wdt: <http://www.wikidata.org/prop/direct/> PREFIX dbo: <http://dbpedia.org/ontology/> PREFIX dbr: <http://dbpedia.org/resource/> PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?film WHERE { { SELECT ?film WHERE { ?film wdt:P161 wd:Q38111.

问题 I am writing a SPARQL query that should delete all triples within in this resource. prefix oslc: <http://open-services.net/ns/core#> prefix example: <http://rdf.company.com/ns/something/net#> prefix xsd: <http://www.w3.org/2001/XMLSchema#> prefix dcterms: <http://purl.org/dc/terms/> prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> example:Resource2 a oslc:ResourceShape ; oslc:describes example:Resource2 ; oslc:property [ a oslc:Property ; oslc:isMemberProperty true ; oslc:name "pgn"

问题 Hi is there a more efficient way to create the following: .addProperty(RDF.type, locah+"/Repository") .addProperty(RDF.type, DCTerms.Agent) .addProperty(RDF.type, FOAF.Agent); What are the advantages of having a resource with multiple RDF.types? 回答1: Multiple RDF types In computational ontologies, an instance can have multiple classes (types). Classification This can be confusing at first, because for example in medical classification this is different. There you have to choose exactly one

问题 I want to be able to infer which ingredients go well together given...their properties and which properties complement each other. I have an ontology like, owl:Thing Ingredient Kale Pear Taste Bitter Sweet owl:topObjectProperty hasTaste tasteComplements goesWellWith Individuals: (*would rather work with just classes) kale a Kale pear a Pear bitter a Bitter sweet a Sweet I've asserted, Kale subClassOf hasTaste some Bitter Pear subClassOf hasTaste some Sweet Bitter subClassOf tasteComplements

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . My project is building a Java web application on top of the AllegroGraph RDF store. I would like to find a good solution to map between the triples that come out of the store and our domain objects. I have looked into Topaz, an Object/Triple mapping API being developed in the spirit of Hibernate. The trouble is

问题 I want to find instances of scientists who both were born and died in prime-numbered years. Building on a previous discussion at this URL, I devised the following query, which is unwieldy and times out: SELECT ?birthYear ?deathYear ?scientist ?scientistLabel WHERE { { select ?value1 { ?number wdt:P31 wd:Q49008. ?number wdt:P1181 ?value1 filter(?value1 < year(now())) } } { select ?value2 { ?number wdt:P31 wd:Q49008. ?number wdt:P1181 ?value2 filter(?value2 < ?value1) } } ?scientist wdt:P106 wd

问题 I created a little metro map with RDF/XML and wonder, how to query the distance between two stops. I'm very new to SPARQL and don't know how to start. "Distance" means, that I want to know, how many stations are between the two ones. Later, I want to calculate the duration, but that's another point. Thats my first approach: PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX ex: <http://example.com> SELECT (count(?mid) as

问题 I'm using Apache Jena to read a RDF file, which looks like this: <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dcat="http://www.w3.org/ns/dcat#" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:dct="http://purl.org/dc/terms/" xmlns:dctypes="http://purl.org/dc/dcmitype/" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"> <dcat:Catalog rdf:about="http://uri/"> <dcat:dataset> <dcat

问题 Suppose I'm defining an OWL ontology for family relationships, and I've already defined the relationships "sister-of" and "parent-of". I'd now like to define a relationship "aunt-of" and specify that this relationship is implied by a chain of the other two. In other words: if X "sister-of" Y, and Y "parent-of" Z, then X "aunt-of" Z. Is there a way to do this? It's similar to owl:TransitiveProperty but that obviously doesn't work. It's also in the same general vein as "owl:inverseOf" in terms

问题 I am trying to apply a range query on a property of the RDF which is of xsd:dateTime format. This is my query: PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT ?x WHERE { ?y <DATE:> ?x . FILTER(?x>"2014-06-05T10:10:10+0530"^^xsd:dateTime) } It gives warning and nothing as result: WARN [main] (Log.java:78) - Datatype format exception: "2014-06-11T12:44:22+0530"^^xsd:dateTime I don't understand what the problem is? I have stored the property in xsd:dateTime format only. 回答1: I have stored