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Questions tagged [graphdb]

Ontotext GraphDB is a semantic triplestore: a database for RDF and OWL data. Use this tag for questions specifically about the Ontotext GraphDB product. For questions that are about graph databases in general (or about other graph database products), use the [graph-databases] tag instead.

In essence, GraphDB™ is a “semantic repository” using ontologies that allow the repository to automatically reason about the data. It works with a flexible and generic physical graph data model allowing for easy interpretation and adoption of new ontologies or metadata on-the-fly. GraphDB™ is packaged as a storage and inference layer (SAIL) for Sesame. Sesame is one of the most popular semantic repositories that supports RDF(S) and all the major syntaxes and query languages related to it. GraphDB is fully SPARQL 1.1 compliant. You can read more about GraphDB™ here. The full documentation can be found here.

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Using Transactions with GraphDB REST API to push a file into a repository

i have the following requirement: After selecting an ontology file i need to send it into my GraphDB-Repository. I´m programming with Angular 8. I looked at the REST API Documentation and tried my best to understand what i need to do (i have like 3…
Jannis Schulz
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Visual Graph showing blank nodes

Ontotext GraphDB 9.0.0, Free Edition, Ubuntu Workstation Linux 4.15.0-65-generic x86_64 I have a graph that contains blank nodes: @prefix : . :Dave :hasFather [ :name "John" ] . When I look at the Explore/Graphs Overview for the default…
Joel Bender
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Removing triples from imported rdf files in a GraphDB repository

I am new to GraphDB and RDF. Currently my repository consists of multiple .ttl files that I have imported separately. If I delete a previously imported file from the import window, the triples remain in the repository. The only way I can see to…
alkey
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Ontotext GraphDB SPARQL Query - No acceptable file format found

Ontotext GraphDB 9.0.0, Free Edition, Ubuntu Workstation Linux 4.15.0-65-generic x86_64 I have a simple SPARQL query that works fine in the Query & Update page and from the web service: select * where { ?s ?p ?o . } limit 5 and if I don't…
Joel Bender
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GraphDB Failed to create JVM after attempting to change java options

Running GraphDB on windows. I right clicked the icon, clicked settings. Tried to set Xmx512Mb, (so I mistyped, should have been Xmx512M). Now trying to run GraphDB says "Failed to create JVM", even after uninstalling and re installing. Where can I…
Flion
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Slow SparQL query when joining two sets of URIs

I am checking a SparQL query which is running too slow on my system. Very much simplified, the query goes like this: # The whole query takes ~20 seconds SELECT ?baseUri_s1 { # This takes ~1 second and returns 3000 results { SELECT…
elvaras
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How to convert xsd:dateTime literal into xsd:date in GraphDB?

I am trying to convert xsd:dateTime into xsd:date to be able to FILTER objects only by dates. But by doing following in GraphDB PREFIX xsd: SELECT ?s ?e { VALUES (?start ?end)…
SVS
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GraphDB Workbench fails to load .owl ontology file from Protégé

I created an ontology with Protege, which is saved as an .owl file. When I try to load it to GraphDB (8.9.0) through Workbench Import -> RDF -> Upload RDF files (The supported RDF formats are .ttl .rdf .rj .n3 .nt .nq .trig .trix .brf .owl .jsonld,…
Sergio Pelin
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GraphDB 8.10 Geosparql geof:nearby how to

I am quite new to sparql and geosparql and I am using GraphDB 8.10 and have already enabled geosparql plugin by executing this in SPARQL interface PREFIX : INSERT DATA { _:s :enabled "true" . } I have…
GGEv
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How to find missing triples after loading a graph to graphDB on Linux?

I have uploaded an SWDF instance of about 200k triples to a graphDB installed in Linux VM. When I count the triples (using SPARQL count) I found that about 300 triples are missing. I want to find out the problem of the missing triples. Is there a…
Abdelmonem Mahmoud Amer
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How compute lucene FuzzyQuery on top GraphDB lucene index?

GraphDB supports FTS Lucene plugin to build RDF 'molecule' to index texts efficiently. However, when there is a typo (missspell) in the word your are searching, Lucene would not retrieve a result. I wonder if it is possible to implement a FuzzyQuery…
Carlos E. Muniz Cuza
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How to execute a SPIN rule using RDF4J API on Ontotext GraphDB

I am using RDF4J to create a repository on Ontotext GraphDB, import an RDF/XML to it and execute a SPIN rule. We can create and configure the repository as shown here…
Zorz Bronze
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Ontodia library - RangeError: Maximum call stack size exceeded

I'm working with Ontodia javascript library to present my graphdb rdf data set. There's this error I couldnt find the cause of it, which happens onload: RangeError: Maximum call stack size exceeded. This function is exactly as the DOCS describes…
ueeieiie
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How to pass the options JSON in the "Create Project" Post Rquest of the OpenRefine ReST-API?

I am currently trying to upload Excel tables (as .xls) to the OpenRefine (or OntoRefine) module of Ontotexts GraphDB. Since I had problems uploading the xls, I decided to first convert the xls file to a csv file and then upload it. Unfortunately,…
Alex R.
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Setting default config for Visual Graph in GraphDB

Is it possible to set a custom advanced graph configuration as a default config to use upon clicking 'Visual Graph' button (e.g. from the 'Graph overview' sidebar) in GraphDB Free 8.4.1? I have declared advanced configurations that are suitable for…
Hanna
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