Tagged Questions

5
votes
5answers
110 views

SPARQL 1.1 implementation

I am looking for a SPARQL 1.1 implementation. Any pointers? Thanks
-1
votes
1answer
41 views

clear all graphs in virtuoso

How can I delete all graphs from virtuoso sparql endpoint. Thanks. Sandeep
1
vote
2answers
85 views

Sort by date optimizations on large dataset

I'm trying to get the most recent articles on a subject out of http://pubmed.bio2rdf.org/sparql. I can get a list of articles on a subject but as soon as I try to order by date the …
2
votes
3answers
213 views

DBPedia SPARQL Endpoint xsd:date comparison weirdness

I'm trying to find persons (soccer players) in DBPedia by name and birthdate. This returns one result (expected): SELECT ?player ?birth { ?player a dbpedia-owl:SoccerPlayer . …
1
vote
1answer
106 views

How to set up a clustered Virtuoso on Debian/Ubuntu?

Cygri mentioned in reply to the question Distributed triple stores that Virtuoso can be set up in a clustered mode. How would one do this using the Virtuoso that comes with Debian …
2
votes
1answer
86 views

Strange query-time estimation on dbpedia sparql endpoint

Take these two queries: SELECT distinct ?name WHERE { optional { ?redirect dbpedia2:redirect <http://dbpedia.org/resource/Lionel_Messi>. ?redirect rdfs:l …
0
votes
2answers
155 views

How do I delete a named graph in Virtuoso?

Hello, This is a simple question but I couldn't find any information. Once I have loaded a graph using RDF_LOAD_XML_MT how do I go about delete it. Thanks Sandeep
1
vote
1answer
218 views

Comparisons of D2RQ and Virtuoso RDF Mapping?

Are there any detailed comparisons between the mapping capabilities of D2RQ vs. those of the wrapper system built into Virtuoso? It seems that the D2RQ package is fairly complete, …
0
votes
1answer
230 views

Virtuoso Reasoner Problem

I've run the following script against virtuoso CLI: sparql clear graph http://jenainftest/#; ttlp('@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>. @prefix rdfs: …
0
votes
1answer
79 views

How to get started with virtuoso universal server for rdf querying.

How to get started with virtuoso universal server for rdf querying using sparql?
2
votes
2answers
172 views

How to speed up rdf:type foo:Bar SPARQL queries by Virtuoso tuning?

I'm running SPARQL queries like: prefix ch: <http://pele.farmbio.uu.se/chembl/?> select count(?s) where { ?s a ch:Compound . } or any other 'a' query asking all Resourc …
1
vote
3answers
330 views

How do I see what named graphs are available on a Virtuoso SPARQL end point?

Is it possible to list the named graphs using a SPARQL query?
1
vote
1answer
131 views

Question about RDFizer Sponger in Virtuoso OpenLink Software

Did any one here use Sponger cartridge available in virtuoso openlink software? I had installed virtuoso opensource triple store and am currently trying to use the sponger cartridg …