sparql

问题 I'm trying to convert a ResultSet to a Model in Apache Jena 3.0. Previously I used the ResultSetFormatter.toModel function, but this seems to have been removed. What's the best way currently to get a Model (for serialization to JSON-LD and RDF/XML) of the ResultSet? 回答1: RDFOutput.toModel ResultSetFormatter operations were deprecated in jena 2.13.0 with placeholders left behind and javadoc referring to RDFOutput . 来源： https://stackoverflow.com/questions/32157314/convert-a-jena-resultset-to

问题 i want to get data with sparql from Medical Subject Headings RDF i try to do this code : PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX meshv: <http://id.nlm.nih.gov/mesh/vocab#> PREFIX mesh: <http://id.nlm.nih.gov/mesh/> PREFIX mesh2015: <http://id.nlm.nih.gov/mesh/2015/> PREFIX mesh2016: <http://id.nlm.nih.gov/mesh/2016/> PREFIX mesh2017: <http://id.nlm.nih.gov/mesh/2017/> SELECT DISTINCT ?descriptor ?label FROM <http://id.nlm.nih.gov

问题 i want to get data with sparql from Medical Subject Headings RDF i try to do this code : PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX meshv: <http://id.nlm.nih.gov/mesh/vocab#> PREFIX mesh: <http://id.nlm.nih.gov/mesh/> PREFIX mesh2015: <http://id.nlm.nih.gov/mesh/2015/> PREFIX mesh2016: <http://id.nlm.nih.gov/mesh/2016/> PREFIX mesh2017: <http://id.nlm.nih.gov/mesh/2017/> SELECT DISTINCT ?descriptor ?label FROM <http://id.nlm.nih.gov

问题 I wanted to transform tabular data into linked data. I was trying to use SPARQL construct to achieve this in GraphDB 9.5 Free edition. From the tutorials in GraphDb website it says "You can press the button SPARQL from the right top corner to access SPARQL end point" . On the new version GraphDb 9.5 there is no SPARQL button after i loaded my tabular data. How do i access the SPARQL endpoint so that i can do my Construct queries? 回答1: With GraphDB 9.4 we introduced an entirely revamped

问题 I have a SPARQL query which is like this- SELECT ?informationPath ?businessEntitylabel ?path ?sourced ?mastered ?delivered WHERE { ?businessEntity dd:hasPropertyPath ?informationPath . ?businessEntity rdfs:label ?businessEntitylabel . ?informationPath dd:hasPath ?path . OPTIONAL { ?informationPath a dd:SourcedData . BIND("Yes" as ?sourced) } OPTIONAL { ?informationPath a dd:MasteredData . BIND("Yes" as ?mastered) } OPTIONAL { ?informationPath a dd:DeliveredData . BIND("Yes" as ?delivered) } }

问题 I have a SPARQL query which is like this- SELECT ?informationPath ?businessEntitylabel ?path ?sourced ?mastered ?delivered WHERE { ?businessEntity dd:hasPropertyPath ?informationPath . ?businessEntity rdfs:label ?businessEntitylabel . ?informationPath dd:hasPath ?path . OPTIONAL { ?informationPath a dd:SourcedData . BIND("Yes" as ?sourced) } OPTIONAL { ?informationPath a dd:MasteredData . BIND("Yes" as ?mastered) } OPTIONAL { ?informationPath a dd:DeliveredData . BIND("Yes" as ?delivered) } }

问题 In some tutorial I'm reading, I see that you can specify the dataset separately from your query, like this: Dataset field: http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf query: PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?name WHERE { ?person foaf:name ?name . } How do I specify the dataset from within the query? 回答1: Use the FROM keyword: PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?name FROM <http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf> WHERE { ?person foaf:name ?name

问题 In some tutorial I'm reading, I see that you can specify the dataset separately from your query, like this: Dataset field: http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf query: PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?name WHERE { ?person foaf:name ?name . } How do I specify the dataset from within the query? 回答1: Use the FROM keyword: PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?name FROM <http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf> WHERE { ?person foaf:name ?name

问题 I am working with an instance of Ontotext GraphDB and often want to clear a named graph with a large number of triples. Currently, my technique involves issuing a SPARQL command to the graph server, which searches and matches a triple pattern of every triple in the named graph: DELETE { GRAPH example:exampleGraph { ?s ?p ?o }} WHERE {?s ?p ?o .} When there are a lot of triples, this approach often takes quite some time to clear the named graph. I am wondering whether there is a more efficient

问题 I am working with an instance of Ontotext GraphDB and often want to clear a named graph with a large number of triples. Currently, my technique involves issuing a SPARQL command to the graph server, which searches and matches a triple pattern of every triple in the named graph: DELETE { GRAPH example:exampleGraph { ?s ?p ?o }} WHERE {?s ?p ?o .} When there are a lot of triples, this approach often takes quite some time to clear the named graph. I am wondering whether there is a more efficient