sparql

问题 I'm getting an error with my SPARQL query but can't find it out: Query PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> PREFIX : <http://dbpedia.org/resource/> PREFIX dbpedia2: <http://dbpedia.org/property/> PREFIX dbpedia: <http://dbpedia.org/> SELECT DISTINCT ?lat, ?long { :Taj_Mahal

问题 This is the original question (This is the 2nd part). I'm using HyperGraphQL to query the EBI-RDF sparql endpoint based on this tutorial. When I execute this GraphQL query to retrieve the parents of GO_0044727 : { Class_GET_BY_ID(uris:[ "http://purl.obolibrary.org/obo/GO_0044727"]) { id label subClassOf { id label subClassOf { id label subClassOf { # <--- 4th sub level id label } } } } } I got no results: { "extensions": {}, "data": { "@context": { "_type": "@type", "_id": "@id", "label":

问题 I am writing a code to extract the following data with SPARQL: POSTCODE, LSOA, and IMD (Index of Multiple Deprivation). I managed to get close to this using two different calls but the approach isn't really what I am looking for because it requires additional matching in R. The first call is described in another stackoverflow question: SELECT * WHERE { ?postcodeUnit a <http://data.ordnancesurvey.co.uk/ontology/postcode/PostcodeUnit>; <http://opendatacommunities.org/def/geography#lsoa> ?lsoa .

问题 One of the standards from W3C for RDB2RDF is Direct Mapping. I heard that there is a problem when converting many-to-many relationship from a relational database and they say it loses semantic, I need more explanation about it. 回答1: ...there is a problem when converting many-to-many relationship from a relational database I'd say that direct mapping introduces additional "parasitic" semantics, treating normalization artefacts as first-class object. Let's consider the D011-M2MRelations

问题 We've installed Fuseki2 as a service at a Ubuntu-server and its works fine: sudo service fuseki status * Fuseki is running with pid: 915 I now can go to http://xyz:30303/manage.html (where xyz it the ip-address of the server) and it shows the Manage datasets screen, but nothing happens when I click add new dataset . Console browser (and also http://xyz:3030/$/server ) gives " Failed to load resource: the server responded with a status of 403 (Access denied : only localhost access allowed) "

问题 I dabbled with DBpedia a couple of years ago and find it fascinating, but now that I want to perform a query after not using it for ages, I find it totally impenetrable. What SPARQL query should I issue to retrieve the set of all Wikipedia pages that are members of both "Category ABC" and "Category XYZ"? All of the examples I can find seem to be quite a bit more involved than my seemingly basic question, making it difficult to distil something minimal. (As an example I'd like to find all

问题 I have a query to get all Capitals. (Capital Cities) SELECT DISTINCT ?Stadt ?label ?Staat ?StaatLabel ?geographische_Koordinaten ?StadtLabel WHERE { SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } ?Stadt wdt:P31 wd:Q5119. ?Stadt rdfs:label ?label. OPTIONAL { ?Stadt wdt:P17 ?Staat. } OPTIONAL { ?Stadt wdt:P625 ?geographische_Koordinaten. } } LIMIT 100 Try it here and the result is: wd:Q61 Washington D.C. wd:Q30 Vereinigte Staaten Point(-77.036666666 38.895)

问题 I'm making that SPARQL query: PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT ?label WHERE { <http://pt.dbpedia.org/resource/Brasil> rdfs:label ?label.} and I don't get any results for ?text . I checked that URI on my browser and found the rdfs:label property there. Is that problem caused by the URI form http://pt.dbpedia.org/ ? I've already used the same query with IRIs starting with http://dbpedia.org/resource/ , e.g.,

问题 i've build a TDB-Store with Apache Jena and now i want to use the data from my store to implement some nice visualizations. So after all it's necessary to access my TDB with JavaScript. I guess, there are two possibilities to archieve this: No. 1: Run a Fuseki Server and run sparql queries on it's endpoint (i.e. http://localhost:3030/dataset/sparql ). How can i query this endpoint with js? No. 2: Access the TDB directly from js. Is this possible? Thanks in advance, FFoDWindow 回答1: I was able

问题 Given an RDF graph like this: :Matrix [rdfs:label] :The Matrix . :Matrix [movie:id] :23 . :Matrix [movie:actor] :Keanu Reaves . :Matrix [movie:actor] :Laurence Fishburne . :Die Hard 3 [rdfs:label] :Die Hard 3 . :Die Hard 3 [movie:id] :42 . :Die Hard 3 [movie:actor] :Bruce Willis . :Die Hard 3 [movie:actor] :Samuel L. Jackson . and a query like this: SELECT ?id ?name ?actor WHERE { ?instance movie:id ?id . ?instance rdfs:label ?name . ?instance movie:actor ?actor . } I would expect a result