jena Questions
4
Solved
Imagine the following Taxonomy (acyclic & directed graph):
<my:Eukaryota> <rdfs:subClassOf> <my:Organism>.
<my:Mammal> <rdfs:subClassOf> <my:Eukaryota>.
<...
Century asked 22/9, 2009 at 7:47
3
I want to generate RDF data from tabular data, in particular: CSV, TSV, spreadsheets (either Excel or OpenOffice) and, eventually, tables in RDBMS.
I am aware of the "RDB to RDF Mapping Language" ...
2
I'm trying to build a small semantic web application using Jena framework, JSP and JAVA. I have a remote SPARQL endpoint and I've already written a simple query which works fine but now I need to u...
Orthographize asked 15/3, 2012 at 23:21
2
Solved
I want to get results from sparql query and the results contain no namespace.
ex: there is result in triple format like:
"http://www.xyz.com#Raxit" "http://www.w3.org/1999/02/22-rdf-syntax-ns#type...
Jackson asked 27/6, 2012 at 20:29
1
I am working with a simple Jena dataset, which only has a single ~30 MB RDF file imported. As a part of the application, I am trying to let users query the default graph (or a named graph) and inse...
1
I cannot describe my problem formally due to my bad English; let me tell it using an example.
The table below is actually grouped by 'subject','predicate'.
We define a set on rows, if they the sam...
2
Solved
I am using Jena ARQ to write a SPARQL query against a large ontology being read from Jena TDB in order to find the types associated with concepts based on rdfs label:
SELECT DISTINCT ?type WHERE {...
2
Solved
1
Solved
Basically I have the following query, and it works in all the online SPARQL testers without a problem, but when using Java and Jena 2.6.4, I never get any results. I've written the values into the ...
1
Solved
So I got this webapp running on a tomcat 7.0.27 which manages a large RDF/Ontology model with Jena, and what I want to do is provide a SPARQL endpoint to enable clients to query this model. Curren...
Broucek asked 14/5, 2012 at 12:3
2
Semantic Web: Best Practices
I am new to Semantic Web, in my application, I'm using Protege,RDF,SPARQL,Jena,Virtuaso. My concern is, in popular Java Frameworks (like Hibernate), we have POJO layer...
Sharpfreeze asked 5/10, 2011 at 4:50
1
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I have a question about SPARQL. I have an ontology of animals:
Animals (is a superclass with object property <hasColor>)
------ Mammals (subclass of Animals)
------------- Dog (subclass of M...
1
Solved
Is it possible to query data from a Model without writing sqarql-queries? Adding properties to resources or resources to models can be done easily, but I haven't found out yet, if there is a more e...
4
Solved
Is it possible to find out whether two instances are of the same class, programmatically (Using api such as JENA)
Quirites asked 29/1, 2012 at 18:40
2
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Say if I want to return the result "having fun" of the triple. I don't know how to account for the space in between the words. Below is a query I tried but it didn't work. Let me know if anyone can...
Antiphrasis asked 29/1, 2012 at 17:28
1
Solved
I have a RDF File like the one shown below. But I am finding it hard to do queries on it. For example could anyone tell me a simple query where I could extract the about (http://websitename.com/url...
1
How to read an ontology (owl file) using jena and populate this ontology (ontModel) from a CSV file then write the populated OntModel into OWL file
2
Solved
I'm starting to work with the Jena Engine and I think I got a grasp of what semantics are.
However I'm having a hard time understanding the different ways to represent a bunch of triples in Jena an...
1
In this level of my work, I need to extract a class synonyms from MeSH ontology.
I am searching for the right syntax for the SPARQL query: how synonyms are they stored in MeSH? and how can I extrac...
Chenille asked 18/5, 2011 at 14:1
1
Solved
I am trying to extract RDF triples from XML files by using an existing ontology. I am using Java, and can use XPath to extract data from XML and Jena to read and write RDF documents and ontologies....
Mathematical asked 14/4, 2011 at 20:42
2
Solved
4
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I have an ontology file (in RDF) which expresses the entities in the app that I am writing. I am using Jena, and can access the Concepts and create/access the resources by directly manipulating tri...
Tarantella asked 4/8, 2010 at 14:40
1
Solved
InfModel infmodel = ModelFactory.createInfModel(reasoner, m);
Resource vegetarian = infmodel.getResource(source + "Vegetarian");
Resource margherita = infmodel.getResource(source + "Example-Margher...
1
Solved
Im trying to create a SPARQL query using Jena to query DBpedia.
The query is working when I use it with standalone tools (Twinkle) but when I plug it in this Java code it returns an empty set.
S...
Sweetie asked 15/2, 2010 at 16:29
3
Solved
we are designing a project that would listen to dialog between airport controllers and pilots to prevent runway incursions (eg. one airplane is taking off while other is crossing the runway). Our p...
Sarad asked 7/11, 2009 at 4:14
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