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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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How to get a simple inferencing example to work

I might have understood something wrong, so bear with me. I created a repository called 'reasoning' of type OWL2-RL (tried some other types already too). I created a rule as follows: prefix sys: INSERT DATA…
Johan Kumps
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Consistency checks for functional properties in GraphDB

I'm trying to import data to GraphDB, but have a problem (or more likely: a misunderstanding) regarding consistency validation on functional properties: I am using a repository with OWL2-RL ruleset and consistency checks enabled, and imported the…
Julius
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SPARQL query against the ontology in ontop-vkg

Is it possible, to query the ontology alongside a virtual graph? I built a test project (Data tables in PostgreSQL - Ontology and mappings in Protege/w Ontop Plugin), and while querying via the Ontop Sparql Tab works fine, the answers only include…
Attila Horvath
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OntoText Refine - UI Issues

I'm new to OntoText GraphDB v10 and was trying the new standalone OntoText Refine v1 to import data but the UI in the RDF Mapping extension seems to be broken, at least on Windows10 version (OSX version works fine). Any idea how I can fix this? Hope…
Geto
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Why do I get onto:explicit statements when querying onto:implicit statements in GraphDB?

On querying statements from onto:implicit in GraphDB 10.0.0 using SPARQL I also get onto:explicit results. Here is an example: select * from where { ?s ?p ?o . } Gives me all statements with context…
enigma
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Is there a way in GraphDB to store reasoning results in different contexts?

Is there a way in GraphDB 10.0.0 to safe the conclusions of different rules in different named graphs or contexts? For example, if I have two rules like this: id: rule1 x a <:Article> y a <:Author> -------------------- y…
enigma
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Submitting a SPARQL query with variable binding to GraphDB REST API

I am trying to submit a SPARQL query to a local repository on Ontotext GraphDB via its REST API. According to the documentation, one of the query params is also $ which specifies variable bindings. Suppose we have a repository called…
Stratos K
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Limit in SPARQL results

I run a SPARQL query in graphDB from an API REST and I get only the first 1000 rows back. I am not using a LIMIT clause at the end of my query. I found in the documentation that number is a default result set limit but how can it be overridden…
José Abad
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Encoding error in SPARQL result set when downloaded after Upgrade to GraphDB 10

since the Upgrade to 10.0 there is an encoding error when downloading a SPARQL result. The error occurs when I concat a hard coded string in the result set: becomes in a CSV (and any other format) result when downloaded. It is displayed correctly…
mr. parchman
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How to create an JDBC SQL view with graphdb REST API in python

I am working with GraphDB on a knowledge graph and would like to dynamically generate JDBC SQL views using the REST API…
SelG
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SPARQL - Extract Last part of a URI

I have a column of URIs from different domains. Example, http://comicmeta.org/cbo/category http://purl.org/dc/terms/hasVersion http://schema.org/contributor and so on. I want to extract the last part, i.e, the string after the last slash '/' on…
AnonymousMe
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Distributed graph DB: Performance measure

I wish to change DB to a graph database. I am looking for a good way to examine engines by performance. What I’m looking for: I will have a small number of queries and a large database, so I will prefer a faster engine rather than an engine that…
Asaf Itach
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Accessing GraphDB with RDF4J with an specific user

I'm using RDF4J to add RDF triples to a completely open (Security off) GraphDB instance. I use the RemoteRepositoryManager and it works fine: RepositoryManager repositoryManager = new RemoteRepositoryManager(GraphDBInstanceURL); Repository…
Mikel Egaña Aranguren
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skos:related vs skos:relatedMatch

Can someone explain to me the difference between skos:related and skos:relatedMatch predicates? My current understanding is that skos:related applies to concepts that are related "within" a scheme, whereas skos:relatedMatch is to concepts across…
AnonymousMe
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Cannot launch GraphDB on Windows10

The installation of GraphDB was completed successfully on Windows 10 but i cannot launch the app. No error pops, instead it doesnt do anything nor running at localhost:7200. Any ideas what might go wrong?
christinaMaria
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