jena Questions
2
Solved
This is an extension of Get all nodes in a transitive relation
Is it possible to get all transitive nodes between two transitive nodes using SPARQL? I tried to dig it out from this site and answer...
2
Solved
I am attempting to use a SPARQL Construct query to create a new named graph from an existing one. The database I am querying contains http://graph.com/old as an existing named graph. I am using Jen...
Amusing asked 20/8, 2013 at 22:21
3
Solved
I'm querying an OWL ontology using SPARQL, but the results show links as well as data. I only want the data. How can I remove the link and show on the data? The output I'm getting is:
------------...
Burdett asked 13/5, 2014 at 8:27
3
Solved
it's my first time writing here but i'm really struck with a problem:
is it possible to use the Jena reasoner on a No-SQL database, like Neo4J, already filled with data?
I've a Neo4J's graph rappr...
0
total database and Java noob here. Need to start learning how to use Jena (I will probably spend a long time reading the official documentation since It looks decent) but I don't know how to actual...
2
Solved
Suppose I have some jena query object :
String query = "SELECT * WHERE{ ?s <some_uri> ?o ...etc. }";
Query q = QueryFactory.create(query, Syntax.syntaxARQ);
What would be the best way to g...
Clef asked 4/3, 2013 at 14:28
1
I have been working on various relationship extraction models in python and all the relationships are currently saved in dataframes or csv files. Eventually I would like to create an RDF graph. Sin...
1
Solved
I am working with org.apache.jena with karaf. While trying to query my model I get a NullPointerException I printed all variables I use for creating the query and all(queryString, inferedModel) are...
Moses asked 27/2, 2019 at 12:10
3
Solved
I'm using Jena TDB for loading an RDF dataset and making SPARQL queries against it. I'm using the following maven dependency:
<dependency>
<groupId>org.apache.jena</groupId>
&l...
Bracteole asked 20/4, 2016 at 21:49
1
Solved
I'm doing a small exercise on sparql. Using Dbpedia Endpoint, I need to count number of triples.
This is my query
// Get the number of triples //
SELECT (COUNT(*) as ?Triples) WHERE { ?s ?p ?...
Tav asked 11/7, 2018 at 14:29
1
Solved
I am trying to find all the release notes of each of the versions released so far for Apache Jena. Where can I find it?
0
We are running Apache Jena Fuseki.
If we upload graphA and graphB
SELECT (COUNT(*) as ?count)
FROM <graphA>
FROM <graphB>
WHERE { ?s ?p ?o . }
gives 100
If we upload triples in...
3
Solved
My goal is to implement a semantic search for my data. My data domain contains proffession skills. I need additional relations for my data structure like 'sameAs' and 'broader'. So, for example if ...
Ceporah asked 13/7, 2012 at 8:8
2
Solved
What's the difference between Apache Jena and Apache Marmotta?
According to my readings both can be used for semantic web purposes. Both supports RDF,Triple store and so on. Both are based on Jav...
Octodecimo asked 6/3, 2015 at 11:15
2
Using the pizza ontology, I want to be able to look up all the toppings for American pizza.
If I open the ontology in Protégé, I can see that American pizza has the following restrictions:
hasTopp...
1
I have installed fuseki and start the server with
#!/bin/sh
cd /home/frank/localInstall/jena/apache-jena-fuseki-2.5.0
exec /home/frank/localInstall/jena/apache-jena-fuseki-2.5.0/fuseki-server -v...
2
I'm serving a dataset containing 10-20 named graphs from a TDB dataset in Fuseki 2.
I'd like to use a reasoner to do inference on my data. The behaviour I'd like to see is that triples inferred wit...
Quijano asked 16/2, 2016 at 9:4
1
Solved
I've got one (maybe) simple question: Can I assign more than one ObjectResource to a fixed Subject-Property Statement?
I want my RDF-Triples look like that:
[http://somewhere/Angela_Merkel, http:...
2
Solved
I got Jena 2.12.1 (2014-10-02) from the Apache Jena Releases page.
It's supposed to have JSON-LD support, according to Reading and Writing RDF in Apache Jena.
But when I try to use riot with an ou...
2
Basically I have a query (shown below) which works efficiently. However, I want my search to be more precise where the label is the actual string 'yago' rather than containing the string 'yago'. I ...
2
Solved
I have just imported jena libraries to eclipse to work on rdf-s and it is my first try, but I cannot read a turtle (.ttl) file.
I tried it in the following way:
import java.io.*;
import java.util...
Willis asked 2/2, 2014 at 17:5
0
1
I am working on querying from a RDF dataset of 2.37 GB with approx 17 million triples in it and lucence index of the dataset is also maintained. I tried text queries of jena-text module which searc...
1
I know the question is asked already but somehow I can't find any convincing solution after googling for about an hour.
I am using apache-jena to load RDF model from a url. And I am getting Incom...
Smaze asked 25/9, 2015 at 11:56
1
Consider the following extract from the GeoNames database :
@prefix gn: <http://www.geonames.org/ontology#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
<http://sws.ge...
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