Questions tagged [openrdf]
38 questions
12
votes
3 answers
Performance comparison of RDF storage vs traditional database
Has someone experiment RDF storage solution like Sesame? I'm looking for performance review of this kind of solution compared to the traditional database solution.
Nicolas
- 24,509
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3
votes
1 answer
Solutions for BNode in Sesame
Is there any solution for processing BNODE in Sesame?
for example:
if(! (statement.getObject() instanceof BNode))
tempModel.remove(statement);
if we have an RDF like { s p1 _:a, _:a p2 "value"), therefore even after removing the…
jd466
- 547
- 1
- 6
- 20
3
votes
1 answer
Loading big RDF file into Sesame
I'm trying to create a SPARQL endpoint based on Sesame. I installed Tomcat, PostgreSQL, and deployed a Sesame's web application. I created a repository based on PostgreSQL RDF store. Now i need to load a big ttl file (540M triples, file size is…
Dilshod
- 65
- 3
3
votes
1 answer
OpenRDF Sesame: how to handle locking?
On my Apache Tomcat server I have an OpenRDF Sesame triplestore to handle RDF triples related to users and documents and bidirectional links between such entities:
http://local/id/doc/123456 myvocabulary:title "EU Economy"
http://local/id/doc/456789…
user3764926
- 33
- 2
3
votes
1 answer
Unable to Parse a SPARQL Result Set since a element has too many Attributes
I'm working with dotNetRDF and was trying to execute a SPARQL query
PREFIX rdfh:
SELECT * WHERE{ ?lo_orderdate ?d_year .
FILTER(?d_year = 1993) }
but got this error when trying to…
Dilshod
- 65
- 3
3
votes
1 answer
ORDER BY solution modifier in CONSTRUCT pattern of SPARQL
I followed SPARQL 1.1 section 10.2 CONSTRUCT and have the following SPARQL query which returns all triples whose subject has type Homework and which also have an event date.
CONSTRUCT { ?s ?p ?o } WHERE
{
GRAPH ?g { ?s ?p ?o } .
{ ?s…
Margi
- 455
- 1
- 9
- 20
3
votes
2 answers
Convert Remote sparql endpoint json results into JSON-LD
I have a Sparql Endpoint(openrdf sesame) on my local machine. I am able to get the results of the queries(6) in json (using sparql-client node module). Now, I need to convert this json into json-ld so that I can easily display it in the jade file.…
Margi
- 455
- 1
- 9
- 20
3
votes
1 answer
Use of typed URI in sesame sail openrdf
My question is simple but maybe non-sense. (in that case , sorry to people who gonna spend time to explain me why )
I'd like to create a resource like (i dont show all the resource declaration here ) :
roky76
- 41
- 3
2
votes
0 answers
How can I bind variables for Blazegraph SELECT SPARQL query for remote repository?
I can't find how to bind SELECT variables for Blazegraph SPARQL query for remote Repository.
Examples exist only for a local repository and with different classes.
IPreparedTupleQuery does not have a bindParameters method.
Doing Prepare every time…
GML-VS
- 1,101
- 1
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2
votes
2 answers
How can I "nest" objects with OpenRDF Alibaba with assigned resource IRIs?
I am trying out OpenRDF Alibaba (associated with Sesame) as a tool to map Java objects to RDF triples and back again. Currently, I'm looking at how it handles object graphs.
I have two objects, Inner and Outer. Outer has a reference to Inner. …
Kaypro II
- 3,210
- 8
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- 41
2
votes
1 answer
All SPARQL queries to my Sesame data store fail (returning nothing). What do I have configured incorrectly?
I've installed openrdf-sesame and openrdf-workbench (2.8.6) under tomcat7 on ubuntu Linux. I loaded the following data:
@prefix mur: .
@prefix branda: .
@prefix brandb:…
Michael Richey
- 85
- 1
- 7
2
votes
1 answer
How to describe classes and properties using RDFS in Java
I am quite new to Java Sesame. I am following this tutorial: http://openrdf.callimachus.net/sesame/2.7/docs/users.docbook?view . I know how to create statements and add them into the Sesame repository. At the moment, I am trying to describe classes…
Mod
- 5,091
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1
vote
1 answer
RDF4J SAIL API implementation
I am trying to build a federated RDF application based on rdf4j and FedX. What I need is to be able to:
Optimize the querying plan and joining strategies.
To expose different and heterogeneous databases (A timeseries or a relational DB for example)…
M.Taki_Eddine
- 160
- 2
- 11
1
vote
1 answer
Cannot import RDF url content into GraphDB
I have on a Web server an URL which serializes a RDF triplestore with Python module rdflib. I want to import this content into GraphDB.
The rdflib.serialize output format is "xml". The MIME type of the HTTP header is "xml/rdf" but the result is the…
remi.chateauneu
- 109
- 2
- 9
1
vote
1 answer
Can openrdf-sesame recover the unseen data in openrdf-workbench?
Somehow I found some of the repositories(physics_base for example) in workbench are missing, but when I searched into the data path /.aduna/openrdf-sesame/repositories/physics_base, I found the data still exist.
So does this mean that there is a…
YJ. Yang
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