Top "Jena" questions

Triple Stores vs Relational Databases

I was wondering what are the advantages of using Triple Stores over a relational database?

relational-database sparql semantic-web jena

Filter by date range in SPARQL

I am using Jena's SPARQL engine and trying to write a query to filter on a date range as I …

datetime rdf sparql jena

Using GROUP BY, COUNT and SAMPLE in apache jena SPARQL

So I have an RDF schema that contains many "groups", and each of these groups has a "name", and contains …

rdf sparql semantic-web jena owl

Querying DBpedia with SPARQL and Jena

I cannot understand how can I query DBpedia using Jena. In the tutorials like here(Listing 4) model is initialized as …

sparql semantic-web jena dbpedia

How to write SPARQL query that efficiently matches string literals while ignoring case

I am using Jena ARQ to write a SPARQL query against a large ontology being read from Jena TDB in …

rdf sparql jena arq tdb

OWL API, Jena API, Protege API, which one to use

I am trying to implement an eclipse based application working with ontologies. (My topic is semantic annotation). I will need …

jena owl protege owl-api

SPARQL Type Conversion?

I have the following SPARQL query: PREFIX ssn: <http://purl.oclc.org/NET/ssnx/ssn#> PREFIX dtp: <…

java types rdf sparql jena

Using Jena to create a SPARQL query on DBpedia

Im trying to create a SPARQL query using Jena to query DBpedia. The query is working when I use it …

java semantic-web sparql jena

How to create an ontology in Java?

I've some data triplets that I want to write in some sort of basic OWL ontology. I've triplets like: Delhi …

java jena ontology

Jena read from turtle fails

I have just imported jena libraries to eclipse to work on rdf-s and it is my first try, but I …

java rdf jena turtle-rdf