Stack Overflow
Stack Overflow

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
0
votes
0 answers

How to create a table containing a LONG VARCHAR column using Pentaho Spoon?

I need to use a simple Pentaho Spoon transformation to copy a table from MySQL database to OpenLink Virtuoso RDB (Virtuoso Open Source). The table on MySQL database contains a column typed LONG VARCHAR. This data type exists in OpenLinkVirtuoso. The…
Luca Sinopoli
  • 1
  • 2
0
votes
0 answers

SPARQL query for "Tree of properties" ( inheritance predicates)

This question was edited to remove an wrong example. You can see a right way to store and query "subjects for inheritance predicates and inheritance objects" below. Based on UninformedUser advise. example.ttl @prefix rdf: …
Nikolay Mashkov
  • 1
  • 1
0
votes
1 answer

How add ontology to `virtuoso-sparql-endpoint-quickstart`?

I'm new to Docker's world. I want to query an ontology locally. I have already configured virtuoso-sparql-endpoint-quickstart. It works, and my endpoint is http://localhost:8890/sparql. Now I want to query my own ontology (not DBpedia). So can I…
bib
  • 944
  • 3
  • 15
  • 32
0
votes
1 answer

Is possible sponge vía proxy to a https address?

I'm working with a virtuoso-opensource cloned from github and compiled on last Friday. The software will be used in a course. The university proxy resolves any (HTTP or HTTPS) requirement ok. Any query including a reference to dbpedia (in example),…
Fernando Carpani
  • 121
  • 1
  • 6
0
votes
1 answer

How to build an N-hop SPARQL (virtuoso) query which returns all paths (1-N hops) starting from a provided topic entity?

I am trying to build a subgraph of freebase based on a given topic entity, as the time taken to query the full freebase is too time consuming. My first attempt at building a 3-hop subgraph was as follows: PREFIX…
user15276611
  • 15
  • 3
0
votes
1 answer

How to shrink virtuoso.db file size after deleting a large graph?

I deleted a large graph in the conductor of a Virtuoso SPARQL 7.20.3217 endpoint but the size of virtuoso.db is still 3.6 GB as it was before, even after restarting the server. Is there a command to clean the database and delete leftover parts like…
Konrad Höffner
  • 11,100
  • 16
  • 60
  • 118
0
votes
1 answer

Virtuoso installation stuck on "VAD Sticker vad_dav.xml creation" on 2nd attempt

I've been attempting to install virtuoso-opensource as per the README here: https://github.com/openlink/virtuoso-opensource The first time I ran make, it breezed passed "VAD Sticker vad_dav.xml creation" to "Starting Virtuoso Server" and then…
Navigateur
  • 1,852
  • 3
  • 23
  • 39
0
votes
0 answers

Bulk loading data into Virtuoso database

I am new to Virtuoso and I want to bulk load data (some .ttl files placed in a directory) into Virtuoso, so I can perform SPARQL queries on the graph. So far, I am confused with the process. Here's what I found: define the data directory in…
BlueBlue
  • 81
  • 1
  • 8
0
votes
0 answers

How to use rdflib to represent Geometrical points in RDF data?

I am using rdflib to convert text files into n3 files for the purpose of saving bus station locations (GTFS).For example if we had latitude=8.0, longitude=5.0, the literal would be: "POINT(5.0…
Looper
  • 106
  • 8
0
votes
0 answers

SPARQL query on sdmx-dimension:refPeriod

I'm trying to run a SPARQL query on sdmx-dimension:refPeriod in order to get the date. The triple that contains the date is in the format: exp:obs0 sdmx-dimension:refPeriod exp:2020-08-03 so when I go to extract the date with: SELECT ?date WHERE…
iacopo pacifici
  • 13
  • 1
  • 5
0
votes
1 answer

openlink virtuoso installation ./config throwing error

I'm trying to install virtuoso's stable/7 branch manually from https://github.com/openlink/virtuoso-opensource. However, when I run ./configure, I get this error message after about 30 seconds: checking OpenSSL version... configure: error: OpenSSL…
Ben
  • 5
  • 3
0
votes
1 answer

How can I automate CKAN data exportation to Virtuoso Open Source Edition?

I'm developing an open data portal with Drupal and CKAN. But now client wants to add Virtuoso Open Source service as a SPARQL endpoint and linked data tool. The system architecture is similar to the following image of datos.gob.es (Spanish…
managume
  • 3
  • 2
0
votes
0 answers

Sparql on Virtuoso

I go to Virtuoso Conductor (http://localhost:8890/conductor)>Linked Data>Quad Store Upload and then i upload a ttl file with 500 rows. However when i go to "http://localhost:8890/sparql" and i query: "SELECT * from …
Niccolo Corsani
  • 15
  • 3
0
votes
0 answers

How can I add the contents of a plain text (or HTML) file to a Virtuoso triplestore?

I have a virtuoso triplestore that contains values like "/path/to/my/plain-text-file.txt". I'd like to have Virtuoso read those files, and then index their contents, so that I could query it somehow with SPARQL. Is that possible? And if so, how can…
Jonathan
  • 10,571
  • 13
  • 67
  • 103
0
votes
0 answers

Maven virtuoso dependency not available

I've used the virtuoso in one of my projects before 1 year now the dependency won't work anymore I have tried to search on the maven repository but not able to find. As I used the Openlink virtuoso at that time but now the dependency not able to…
vimalDev
  • 412
  • 1
  • 4
  • 25
1
2
3