I have a org.apache.jena.riot.RiotException: Bad character in IRI (space) exception when reading an OWL/RDL model in Jena. I know that it's because I ...

I've set up some namespaces in virtuoso, but when I used jena to do sparql queries in virtuoso, some namespaces were not abbreviated: @prefix sio: ...

I have an Ontology which have some SWRL rules (created using Protege). I am using OWL API to manipulate the ontology and using JENA API for SPARQL Que ...

I know Jena SDB has been end of life since Dec 2020. Nevertheless, I wonder what SDB stands for. Is is Statement Data Base or Semantic Data Base? Even ...

I saved and generated these RDFs using the Jena API, and it came out as follows. Used Jena API and result I understand that rdf:resource can be ...

I'm looking to incorporate Fuseki into a project where I need to update a graph, but so far I have not been able to get it to work. To demonstrate thi ...

I set up SPARQL endpoints on several linux servers(RDF database: fuseki 4.4.0, Number of triples: 6000000), and then queried several SPARQL endpoints ...

I know I can select default and/or named graphs for queries, but my question is: Can I hide any named graphs in Apache Jena from being listed or quer ...

I am trying to send a large file(1GB) to virtuoso local server using jena and its taking a lot of time according to my current implementation Is th ...

I have an OWL model that has the data property hasToken that has range xsd:boolean, so it can have values either true or false. Let's say the the doma ...

Let's say I have the following shapes graph This shapes file is stored with appropriate prefixes (not shown) and I read it using the Jena API the f ...

I have a datatset and I create a ttl file after any changement of my dataset. The output of my file after using is something like : RDFDataMgr.write( ...

I am trying to give a set of bash instruction to my docker container when it launch. but when I try to launch this docker file everything works great ...

How to register JS Function to apache jena fuseki? Is it the same as registering a JS Function to GraphDB.ontotext? ...

I am using apache-jena-4.5.0 and fuseki pretty much out-of-the-box. I had created a TDB2 dataset using fuseki, but now shut it off and using command-l ...

How can I use Jena to run SPARQL update queries to a remote endpoint? (assuming I am allowed to). So far, what I have is the following UpdateRequest ...

When I run the example from the docs(https://jena.apache.org/documentation/ontology/): I get following error: SLF4J: Failed to load class "org.slf4j. ...

I'm creating a web app (spring + react) that will query an endpoint (selected by the user) with a certain query. For the purposes of this app I'm usin ...

I'm trying to get Jena ARQ as suggested in O'Reilly SPARQL 1.1 book so I can follow along with the query examples in the book. I've downloaded apache- ...

Summary: I am trying to use the documentation on JavaScript SPARQL Functions to get a minimal working example of calling a custom javascript function, ...