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Questions tagged [virtuoso]

Virtuoso is a multi-model relational database management system for data represented as Relational Tables and/or RDF Property Graphs. It is also equipped with in-built middleware for conceptual data integration across heterogeneously shaped and disparately located data.

Virtuoso, (a/k/a OpenLink Virtuoso and the Virtuoso Universal Server) from OpenLink Software, is a high-performance and scalable native relational database management system (RDBMS) for data (relations) organized as tables and/or property graphs. In addition to its RDBMS functionality, it is also equipped with a middleware layer that enables conceptual data integration and web services deployment.

Virtuoso is the RDF DBMS behind live services such as DBpedia, Uniprot, Bio2RDF, the Linked Open Data Cloud Cache, and many other bubbles in the Linked Open Data Cloud.

Product-specific questions are often best raised to product-specific arenas. For Virtuoso, these include the OpenLink Community Forum, the Virtuoso Users mailing list, Open Source Edition GitHub-hosted project bug reports and other issues, confidential Support cases, etc.

Related tags :

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Merge two or more resultsets to a formatted JSON format

I am running a query that outputs some JSON results retrieved from RDF graphs. Results are printed as: { "head": { "vars": [ "uri" , "label" ] } , "results": { "bindings": [ { "uri": {…
callback
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How to load a n-triple file in virtuoso using Jena API

Jena has the read method that helps loading an ontology from file in the model. Is there something similar for virtuoso using the Jena API? That will greatly helps me test virtuoso on my already existing ontology store in n-triple format.
Fopa Léon Constantin
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Virtuoso and Jena: Large RDF graphs loading issue

I have a 200GB RDF file in .nt format. I want to load it in Virtuoso (using Virtuoso Open-Source Edition 6.1.6). I used Virtuoso bulk loader from command line but loading gets hang after couple of hours of running. Do you have any idea how I can…
Beautiful Mind
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apt-get unusable because of virtuoso-opensource-7.0-common

On our server we have Virtuoso 6.1 installed but somehow Ubuntu tries to install Virtuoso 7 as well (or maybe someone tried to install it). In any case, now apt-get is not usable at all and proposes to be fixed with apt-get -f install which fails…
Konrad Höffner
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Which dump is fastest to import in open source virtuoso - n3/nt/xml?

I am importing some RDF dumps into Virtuoso Open Source edition (6.x). I was wondering if there is a performance difference between importing different serializations of the same data (I have NT/N3/XML available). While I'm at it : has anyone seen…
Arthur Lutz
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sharepoint is throwing securityException on silverlight, even though clientaccesspolicy.xml is in place

after one day of thorough searching for solutions, I'm at a standstill over the following issue: I am adding a aspx-page with silverlight app as a feature to my sharepoint. The app accesses the sparql-endpoint from a virtuoso service and works fine…
chile
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Redland context in Virtuoso

I'm using the Redland Python bindings to add triples to Virtuoso RDF.Storage(storage_name='virtuoso') and am trying to understand how context is implemented. I am getting some surprising results. If I add triples…
heyitsbmo
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use more than 1 input inference in Virtuoso

I have one input inference in Virtuoso Open Source, that was defined from goodrelations site -- rdfs_rule_set('http://purl.org/goodrelations/v1', 'http://purl.org/goodrelations/v1'); -- that I used in query using -- define input:inference…
RedWhiteMiko
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Virtuoso SPARQL not retrieving values

I am uploading a RDF file to a Virtuoso Repository vía de graphic interface (ODS-Briefcase). The file is uploaded successfully. However, every time I make a SPARQL query, an empty result is returned. I have tried with many other files, and I did not…
User 23
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Create and insert informations (indivituals) into an OWL ontology or into RDF file

what is the best practice ? I have created an ontology using Protege in OWL-DL, and i want to, use Jena API for JAVA, to populate it with instances (individuals) by importing informations from a file. Do i have and is it possible to import the…
azedra
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Virtuoso DBpedia load - parsing errors

I have a lot of errors when I want to load DBpedia dataset. For example: 22007 XM003: XML parser detected an error: ERROR : Tag nesting error: name 'img' of end tag does not match the name 'p' of start tag at line 4 column 432 at line 4…
Roman
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Is it possible to add virtuoso as a storage provider in Jena-Fuseki?

I am trying to set up virtuoso as a storage provider service inside Jena-Fuseki config.ttl file is it possible to add this service as RDF database to Fuseki, is it a right way or I must have to add virtuoso.jena.driver Packege inside…
Zeeshan Haider
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querying rdf triples

How can I write sparql query where I can compare the variables (?a, ?b), if I have the following eg? (something's wrong with this eg?): …
DGT
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Error when I load RDF triples on Virtuoso TripleStore

I have a question. I'm following the sample8 on http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtJenaProvider. In particular, I have this code: package ExampleVirtuoso; import com.hp.hpl.jena.query.*; import…
Musich87
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How to avoid timeout, i.e., do time-unlimited query, on Virtuoso SPARQL endpoint?

Every time I do a query in http://dbpedia.org/sparql endpoint or my local Virtuoso store, I get a time out error after some considerably large time (like 30 mins through my own experience) . For querying DBpedia's online SPARQL endpoint, I use the…
Vini
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