sparql

When I execute the following query on http://dbpedia.org/sparql using (dotnetRDF) VDS.RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet() everything works fine. SELECT ?film ?p ?o WHERE { ?film <http://purl.org/dc/terms/subject> <http://dbpedia.org/resource/Category:Japanese_films> . ?film ?p ?o } limit 500 But when I try this query using SparqlRemoteEndpoint.QueryWithResultGraph() CONSTRUCT { ?film ?p ?o} WHERE { ?film <http://purl.org/dc/terms/subject> <http://dbpedia.org/resource/Category:Japanese_films> . ?film ?p ?o } limit 500 I've got RdfParseException with message "[Line 456 Column 29]

I want to find the two nearest neighbors of each point dataset : :p1 :has_position 1 . :p2 :has_position 2 . :p3 :has_position 3 . :p4 :has_position 4 . expected results : ?POINT ?NEIGHBORS "p1" "p2; p3" "p2" "p1; p3" "p3" "p2; p4" "p4" "p2; p3" I try something like this : SELECT ?POINT ?POS (group_concat(?idPointN;separator='; ' )as ?NEIGHBORS) WHERE{ ?idPoint :has_position ?POS . ?idPointN :has_position ?POSN . FILTER (?idPoint != ?idPointN) } GROUP BY ?POINT ?POS this return all the neighbors of points. I want to do somthing like ORDER BY(?POS-?POSN) and limit 2 in the group_concat but i

I am trying to run this query on http://dbpedia.org/sparql but I get an error that my query is too expensive. When I run the query trough http://dbpedia.org/snorql/ I get: The estimated execution time 25012730 (sec) exceeds the limit of 1500 (sec) ... When running the query through my python script using SPARQLWrapper I simply get an HTTP 500. I figure I need to do something to optimize my SPARQL query. I need the data for iterating over educational institutions and importing it in to a local database, maybe I am using SPARQL wrong and should do this in a fundamentally different way. Hope

I have the following delete statement: delete {?s ?p ?o} {<http://www.example.org/test/unit213> ?p ?o. ?s ?p ?o} The URI http://www.example.org/test/unit213 is valid, since I get on select, among others, <http://www.example.org/test/unit213> rdf:type <http://www.example.org/test/unit> Still, I get the following result: No result Can anyone tell me why? That's probably correct, SPARQL Update operations aren't supposed to return any results. By the way, I would discourage that style of Update without the WHERE keyword, it's very easy to misread. - Steve 来源： https://stackoverflow.com/questions

Is it possible to CONSTRUCT an RDF sub-graph that contains nodes A, B, C, E, F (but no D, G, H) from the following graph (in notation subject-predicate-object for a total of 7 statements) using a single SPARQL query: A-p-B A-q-C A-r-D A-s-E E-t-F A-u-G G-v-H I know how to formulate a SPARQL query that returns { A-p-B, A-q-C } (i.e. two paths consisting of 1 statement each) and one that returns { A-s-E E-t-F } (i.e. one path consisting of 2 statements). But it it possible to fold both into as single SPARQL CONSTRUCT query and if so, how would that look? It's much easier to work with data if you

What is a good way to return SPARQL query results in JSON-LD , preferably staying close to the standardized JSON format ? Can JSON-LD be returned for every query or only for certain query types? An example of a SPARQL query result in JSON format (i.e., without JSON-LD enrichment): { "head": {"vars": ["s", "p", "o" ]}, "results": { "bindings": [ { "s": { "type":"uri", "value":"http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }, "p": { "type":"uri", "value":"http://www.w3.org/1999/02/22-rdf-syntax-ns#type" }, "o": { "type":"uri", "value":"http://www.w3.org/1999/02/22-rdf-syntax-ns#Property" } }

The SPARQL SELECT ?c0 ?l0 WHERE { ?c0 rdf:type <XXXX>. OPTIONAL { ?c0 rdfs:label ?l0. } } shows two columns c0 and l0 . Any way to show only one column c0 ,but with the content of the ?l0 as the title of the ?c0 ? The result would look like select ?co as ... If I understand you correctly, you can do this with coalesce , which returns its first non-error bound argument. First, here's some data where there's a class :dog with the label "Dog" , and a class :cat which has no label: @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix : <http://example.org/> . :dog a rdfs:Class ; rdfs