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Questions tagged [openlink-virtuoso]

Official site

Technically, Virtuoso is a modern enterprise-grade solution for data access, virtualization, integration and multi-model relational database management (SQL Tables and RDF Graphs).

Conceptually, Virtuoso provides a “Data Junction Box” that drives enterprise and individual agility by deriving a Semantic Web of Linked Data from existing data silos.

Please use the tag instead.

41 questions
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Wikidata import into virtuoso

I would like to load wikidata into virtuoso. After days of searching I was unable to find any tutorial or at least somebody that uses virtuoso to sparql query wikidata. I would not like to spend money on a server to load 50G+ data for nothing. Why…
FranMercaes
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How to use simple vocabulary line with GeoSPARQL:sfWithin and polygon?

RDF: prefix ex: prefix geo: ex:b7 a sf:Line ; geo:asWKT " LINESTRING(55.3 -160.5,55.3 -160.5)^^geo:wktLiteral . SPARQL query: prefix…
There
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What flavors of reasoning are supported in VOS?

What kind of OWL profiles are supported in VOS DL, EL, QL ,RL? Is is possible to use or integrate standard reasoners? (Hermit, Pellets, etc.)
Ric
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Wikidata Virtuoso SPARQL Endpoint - How to get more than 100,000 results

I need to get Wikidata artifacts (instance-types, redirects and disambiguations) for a project. As the original Wikidata endpoint has time constraints when it comes to querying, I have come across Virtuoso Wikidata endpoint. The problem I have is…
user15519921
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Closing OpenLink Virtuoso HTTP Connections

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…
João Rocha da Silva
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SPARUL INSERT access denied even after granting update permission

I have a Virtuoso server running on a remote machine and can access the conductor UI by logging in as dba user. I have created a graph using Linked Data -> Quad Store Upload on which I am able to run select SPARQL queries from Linked Data -> SPARQL.…
walt3rwhite
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OpenLink Virtuoso vs Virtuoso Universal Server

At the risk of this question being closed, I'm going to ask it anyway since I'm quite lost, and I really need to make a decision. I'm inclined for OpenLink Virtuoso at the moment since it's open source. However, does Virtuoso Universal Server…
Joe DiNottra
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SPARQL property paths x/y+ yields different result than x UNION x/y+

The specification of SPARQL 1.1 property paths contains: elt1 / elt2 A sequence path of elt1, followed by elt2 elt* A path of zero or more occurrences of elt. elt+ A path of one or more occurrences of elt. My expectation from that is…
Konrad Höffner
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How to query implicit properties of owl:equivalentclass

I want to query an ontology which contains implicit properties hold by owl:equivalentclass objects. How can I achieve this? The ontology holds triples like this: rdf:type . The class…
Adrian
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How can I send SPARQL queries via curl (over HTTP) to Openlink Virtuoso and obtain the results in JSON

I am looking for extensive sparql-graph-crud documentation or other mechanism which details how to submit queries to Openlink Virtuoso SPARQL endpoint. In short, I would like to learn how to send SPARQL queries (with WHERE clauses) via curl (over…
Allan Kamau
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Reasoner in Virtuoso Jena program

I am using Virtuoso Jena Provider to query my graph which is uploaded on Virtuoso but I also want to add reasoning in my queries. I have tried this code but I get an error on the .execSelect(); line Exception in thread "main"…
Stelios Botonakis
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using sparql to find best match for a string in dbpedia?

I have a list of strings (contains name entities, names, verbs, etc.) and for each of them, I want to find out if there is any node equivalent to that string in DBpedia dataset. I am using SPARQL to query DBpedia on my machine. As far as I know,…
Nilou
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Null pointer exception error while using BIND in SPARQL query in JENA virtuoso

I am getting below error while running SPARQL query, ERROR [main] (RDFDefaultErrorHandler.java:40) - (line 7 column 7): {E201} The attributes on this property element, are not permitted with any content; expecting end element tag. ERROR [main]…
vimalDev
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How to make SPARQL queries faster on Virtuoso by controlling query execution order?

I have set up a Virtuoso server for hosting Freebase data (version 07.20.3217, built Jan 5 2017; I really appreciate if you can have a try). Let's consider this scenario: find the largest location (probably a county, denoted by ?var1) in Wisconsin…
Kangqi Luo
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Adjusting result set in SPARQL (extracting part from URI)

I am beginner in SPARQL, and I want to make query on DBpedia to use the result then in Java-Programm as a JSON file . I use this simple SPARQL query on http://dbpedia.org/snorql or https://dbpedia.org/sparql PREFIX owl:…
Eddi
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