virtuoso

When I go to http://localhost:8890/sparql/ , there are two fields: Default Data Set Name (Graph IRI) and query . How can I list what all graphs (that go in the former field) are available in my DB? The field is not mandatory and I can just run a query against all namespaces. But I would like to know how to list the graphs available. The only non-empty graph I was able to run was http://localhost:8890/sparql For example, in a relational database environment, I believe this kind of info could be retrieved from system tables. As noted in comments, this query will get you a list of all Named

We are using OpenLink Virtuoso as the primary database manager for a NodeJS project. We query the database using SPARQL queries only, through the HTTP SPARQL endpoint. For this, we are using the request-promise library, with the following configuration: const queryRequest = rp({ method: "POST", uri: queryObject.fullUrl, form: { query: queryObject.query, maxrows: queryObject.maxRows, format: queryObject.resultsFormat }, headers: { 'content-type': 'application/x-www-form-urlencoded' }, json: true, forever : true, // Keep connections alive instead of creating new ones timeout : Config

I have the following Query PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT ?type WHERE { { SELECT * WHERE { ?x rdfs:subClassOf ?type . } } OPTION (TRANSITIVE, t_distinct, t_in (?x), t_out (?type) ) . FILTER (?x = <http://dbpedia.org/ontology/Hospital>) } It works fine when i send it to Virtuoso endpoint but does not work on my Jena instance. In specific i get the following error: INFO [1] 400 Parse error: PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT ?type WHERE { { SELECT * WHERE { ?x rdfs:subClassOf ?type . } } OPTION (TRANSITIVE, t_distinct, t_in (?x), t_out (?type

My goal is to graphically represent the S->P->O relations within a depth two edges from the specified resource, p:Person_1 . I want all relations within that path length to be returned from my query as ?s, ?p, ?o for further processing in my graphical application. I tried the first query below which gives me my first set of ?s ?p ?o with repeats, then ?p2, ?o2, ?p3, ?o3 as additional columns in the result. I want to bind ?p2 and ?p3 to ?p , ?o2 and ?o3 to ?o . SELECT * WHERE { p:Person_1 ?p ?o . BIND("p:Person_1" as ?s) OPTIONAL{ ?o ?p2 ?o2 . } OPTIONAL{ ?o2 ?p3 ?o3 . } } Then, based on How do

I'm trying to extract all parents of a each given GO Id (a node) using EBI-RDF sparql endpoint , I was based on this two similar questions to formulate the query, here're two examples illustrating the problem: Example 1 ( Link to the structure ): biological_process (GO:0008150) |__ metabolic process (GO:0008152) |__ methylation (GO:0032259) In this example, using the following query: PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX dc