sparql

问题 The problem is how to calculate the distance between two nodes (concepts) in a Triple Store (RDF) using sparql queries without know the type of edges. Essencially, is to use Dijkstras_algorithm to find the shorter path between two concepts in a Triple Store. It is possible if we know the type of egde: Calculate length of path between nodes? One other solution is to use classes distances(do not work if concepts are not extended from the main classes): Measuring distances among classes in RDF

来源： https://stackoverflow.com/questions/54676317/graphdb-free-8-8-sparql-insert-returning-400-insert-not-supported

来源： https://stackoverflow.com/questions/56768463/wikidata-import-into-virtuoso

来源： https://stackoverflow.com/questions/64039293/sparql-paths-where-the-subject-and-object-are-not-of-the-same-class

来源： https://stackoverflow.com/questions/64039293/sparql-paths-where-the-subject-and-object-are-not-of-the-same-class

来源： https://stackoverflow.com/questions/33916754/comparison-of-linq-to-sparql

来源： https://stackoverflow.com/questions/63788703/query-works-on-wikidata-query-service-but-not-on-apache-jena-copy

来源： https://stackoverflow.com/questions/63788703/query-works-on-wikidata-query-service-but-not-on-apache-jena-copy

来源： https://stackoverflow.com/questions/63808939/applying-pagerank-to-a-topic-hierarchy-treeusing-sparql-query-extracted-from-db

问题 I'm trying to run SPARQL queries with Fuseki Server on Ubuntu 18.04. When I try to start the server in the terminal with ./fuseki-server --update --mem /ds , I get the following errors. I've seen some similar questions and I assume it has something to do with compatibility issues with Java 11. I've installed Java 8, and I still get the same errors. I'm not sure how to proceed from here. WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance. 2020-06-18