jena Questions
1
Solved
I am developing an application, which is using triple store (Jena TDB). It is clealy mentioned that TDB Supports SPARQL update and Query. Also, I understood that Fuseki is SPARQL server, that suppo...
Neelon asked 25/5, 2015 at 5:41
1
Solved
Using the following query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#...
5
Solved
what is the most common tool used for Reading & Writing RDF and Querying with Sparql with different end points .
so far i've found
Jena (jena.net) : it's developed for Java but some people m...
Wofford asked 1/2, 2012 at 3:14
1
Solved
I'm trying to query dpbedia to get the categories of some wikipedia articles using Jena and ARQ
For example:
select ?category { dbpedia:ARTICLE_NAME dcterms:subject ?category }
Here is an exam...
1
Solved
I'm struggling with the execution of a SPARQL query in Jena, with a resulting behaviour that I don't understand...
I'm trying to query the Esco ontology (https://ec.europa.eu/esco/download), and I...
1
Solved
I have been given what I thought would be a simple task - take an existing SPARQL query and adapt the WHERE clause to restrict results to entities where a specific text field contains a specific se...
2
Solved
I have computed the indegree and outdegree of each node in the directed graph in two separate queries:
SELECT ?s (COUNT(*) AS ?outdegree)
{ ?s ?p ?o }
GROUP BY ?s
ORDER BY DESC(?outdegree)
SELE...
1
Solved
I am using Jena's SPARQL engine and trying to write a query to filter on a date range as I need to find the value of a property after a fixed date.
My date property is in the following format:
F...
1
I'm writing a code generator that generate entities (POJO's in Java language) from the schema defined here http://schema.rdfs.org/all.ttl. I'm using Jena to parse the ttl file and retrieve the meta...
Nathan asked 1/4, 2014 at 21:40
1
Solved
If I have classes ABC and CDE defined as intersections of classes A,B,C,D,E as follows:
<Class rdf:about="&blah;ABC">
<equivalentClass>
<Class>
<intersectionOf rdf:pars...
2
Solved
I am new to both Jena-TDB and SPARQL, so it might be a silly question. I am using tdb-0.9.0, on Windows XP.
I am creating the TDB model for my trail_1.rdf file. My understanding here(correct me if...
5
Solved
I've some data triplets that I want to write in some sort of basic OWL ontology. I've triplets like:
Delhi is part of India
or
India is an Asian country
Note that I've relations like "is-a"...
2
Solved
I'm trying to import LinkedMDB (6.1m triples) into my local version of jena-fuseki at startup:
/path/to/fuseki-server --file=/path/to/linkedmdb.nt /ds
and that runs for a minute, then dies with ...
2
Solved
I am working on a project for my studies right now and I need some help.
Basically, I need to convert the following RDF to representations of a Java class. I read the RDF to a model and from ther...
Pagurian asked 8/12, 2013 at 11:53
1
Solved
I need to perform a query against DBpedia:
SELECT DISTINCT ?poi ?lat ?long ?photos ?template ?type ?label WHERE {
?poi <http://www.w3.org/2000/01/rdf-schema#label> ?label .
?poi <http:/...
Isologous asked 30/5, 2013 at 9:46
2
Solved
How can I retrieve the length of a path between two nodes? For instance, given an organizational hierarchy, how can I determine how far separated are a parent and an descendant organization? Consid...
1
Solved
There is a strange behaviour in the connection of the commandline tools of ARQ, TDB and Named Graphs. If importing data via tdbloader in a named graph it can not be queried via GRAPH clause in a SP...
Herd asked 19/9, 2013 at 10:0
1
Solved
Add just this one quad to an empty store:
<http://x.com/s> <http://x.com/p> 2 <http://x.com/g> .
Then execute this SPARQL query (taken from per Bob DuCharme's book 'Learning SP...
Labial asked 21/8, 2013 at 19:43
1
Solved
I am trying to extract labels from DBpedia for some persons. I am partially successful now, but I got stuck in the following problem. The following code works.
public class DbPediaQueryExtractor ...
4
Solved
I was wondering what are the advantages of using Triple Stores over a relational database?
Dornick asked 6/2, 2012 at 11:3
1
I am trying to implement an eclipse based application working with ontologies. (My topic is semantic annotation). I will need to display the ontology to the user (as a tree) and to establish ...
2
Solved
I want to download two or more datasets on my machine and be able to start a SPARQL endpoint for each. I tried Fuseki which is part of the Jena project. However, it loads the whole dataset in memor...
Contempt asked 9/6, 2013 at 2:18
1
Solved
So I have an RDF schema that contains many "groups", and each of these groups has a "name", and contains a number of "elements". I need to select the name of every group, along with the number of e...
Bannerol asked 1/5, 2013 at 1:56
2
Solved
I am trying to discover whether I had a specific resource in the model. For that I am using:
model.getResource("example")
Checking the doc, this method behaves exactly as createResource. Then, e...
2
Solved
I am a beginner with Semantic Web technologies, My question might be a very basic one but I am really stuck figuring it out.
I have a RDF file I created from an XML and have validated it using w3....
© 2022 - 2024 — McMap. All rights reserved.