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Questions tagged [openrdf]

38 questions
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org.eclipse.rdf4j vs org.openrdf

I am learning on RDF and framework to implement them from RDF4J. While exploring I came across two APIs that seem to be very similar. This is the one that RDF4J uses in its examples. These start with org.eclipse.rdf4j.... There is a very similar API…
whitehat
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Connect to RDF4J server with Sesame library?

I am working on a project that primarily uses Blazegraph as a back-end, and from what I understand, that locks me into a relatively old Sesame (2.7.12). The project has another component that can use an embedded Sesame, or a free-standing Sesame OR…
Mark Miller
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Use of namespace prefixes in import statements for Turtle documents causes failures when using OWLAPI

If an ontology being saved (using OWLAPI) in Turtle format uses a set of prefixes, the import statements for the imported ontologies, use the declared prefixes. The ontology thus saved using the prefixes cannot be read back by the OWLAPI Turtle…
Nilesh
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RDF4J rdf lucene configuration

I have been trying for some time to configure my sesame RDF repository (at the moment is called RDF4j) in order to use full text queries. I did not find much documentation about this configuration, I think that I need to create a template file so…
Hibernator
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Check if a predicate is of standard type in Sesame

Is there any possibility in Sesame to check if a Predicate (URI), is w3c standard predicate(RDFS predicates for example) like RDF.TYPE or is included in RDF vocabulary?
jd466
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Handling Blank nodes in Sesame

In Model.filter(), I would like to store the objects. But if the object is a blank node, I would like to retrieve the corresponding triple and store the real object. The problem in Model.filter() is that If the blank node(object) is _:a , the…
jd466
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First call to openrdf-sesame update endpoint it very slow. Is there a way to optimize it?

We have some python scripts to execute both sparql queries and "updates" (an insert/delete). Here is most of the relevant code (I think): server = "localhost" repo = "test" query_endpoint = "http://%s:8080/openrdf-sesame/repositories/%s" %…
Michael Richey
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Cloudbees Tomcat Application IOException

I'm using Cloudbees as my Java PaaS, I have created to Tomcat 8 Applications and uploaded two WAR files: OpenRDF Workbench OpenRDF Sesame [source: http://www.openrdf.org ] I uploaded Workbench and after the supposed waiting period, my instance of…
Paulo Oliveira
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Importing Triples with Tinkerpop/bluebrints into OrientDB

Im trying to import RDF-Triples into OrientDB with help of tinkerpop/blueprints. I found the basic usage here. Im now that far: import info.aduna.iteration.CloseableIteration; import org.openrdf.model.Statement; import…
user1882812
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How make org.openrdf.rio parser supports Turtle documents?

I have a java project on Eclipse that read R2RML (.ttl) file. I am using R2RMLReader from it.unibz.inf.ontop.r2rml.R2RMLReader which uses Open RDF Rio org.openrdf.rio.Rio, here is the method code: public static ArrayList readR2RMLFile()…
نظام الارشاد الطلابي
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Possible causes for an intermittent IOException error?

I am attempting to write to a Blazegraph database file multiple times using the OpenRDF Java API. Here is some pseudocode that mimics what I'm trying to do: //create Connection to the database Repository repo = new…
hayfreed
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Sesame And RDF4J Custom Server Data Location

I have a Tomcat instance running an openrdf-sesame environment. By default the location of my openrdf-sesame database configuration and data is at %APPDATA%\aduna. I am trying to change where this data saves to something custom like C:\aduna. I have…
MrJman006
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how to insert a list in rdf

I have a graph, and in this graph I have a list like this: :Michelangelo :representativeFor :Italy; rdfs:label "Michelangelo di Ludovico Buonarroti Simoni"; :birthInfo [:date "1475-03-10"^^xsd:date; :place …
Anca Ioana
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UNRESOLVED DEPENDENCIES org.openrdf#sesame;2.3.1: not found

I'm trying to use spark with C-SPARQL in a sbt project, I am getting unresolved dependencies errors when trying to build the project [info] Resolving org.openrdf#sesame;2.3.1 ... [warn] module not found: org.openrdf#sesame;2.3.1 [warn] ==== local:…
testing
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What are possible causes of Multiple ID-statement Exception in Sesame?

I would like to know what are possible causes that can rise the following Exception ? org.openrdf.repository.config.RepositoryConfigException: Multiple ID-statements for repository ID test_3 It rises when i try to query the test_3 repository.…
Fopa Léon Constantin
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