Using Jena to convert an owl file to N-Triples from terminal returns an empty file

Question

I have generated an owl file using this generator http://swat.cse.lehigh.edu/projects/lubm/

I want to transform the file in N-triples and have done it before using

$ riot -out N-TRIPLE ~/lubm20/*.owl > lubm20.nt

for some reason now I get an empty file (lubm20.nt)

and when I use

$ rdfcat -out N-TRIPLE ~/lubm20/*.owl > lubm20.nt

I get this error

Exception in thread "main" org.apache.jena.riot.RiotException: <file:///root/lubm20/classes\University0_0.owl> Code: 4/UNWISE_CHARACTER in PATH: The character matches no grammar rules of URIs/IRIs. These characters are permitted in RDF URI References, XML system identifiers, and XML Schema anyURIs.
at org.apache.jena.riot.s5ystem.IRIResolver.exceptions(IRIResolver.java:371)
at org.apache.jena.riot.system.IRIResolver.resolve(IRIResolver.java:328)
at org.apache.jena.riot.system.IRIResolver$IRIResolverSync.resolve(IRIResolver.java:489)
at org.apache.jena.riot.system.IRIResolver.resolveIRI(IRIResolver.java:254)
at org.apache.jena.riot.system.IRIResolver.resolveString(IRIResolver.java:233)
at org.apache.jena.riot.SysRIOT.chooseBaseIRI(SysRIOT.java:109)
at org.apache.jena.riot.adapters.AdapterFileManager.readModelWorker(AdapterFileManager.java:286)
at org.apache.jena.util.FileManager.readModel(FileManager.java:341)
at jena.rdfcat.readInput(rdfcat.java:328)
at jena.rdfcat$ReadAction.run(rdfcat.java:473)
at jena.rdfcat.go(rdfcat.java:231)
at jena.rdfcat.main(rdfcat.java:206)

The generator would generate a well known semantic web benchmark dataset so how can it have

UNWISE_CHARACTER s?

edit: for the question asked I used this line to generate the *.owl files

java edu.lehigh.swat.bench.uba.Generator -onto http://swat.cse.lehigh.edu/onto/univ-bench.owl univ 20

then moved the *.owl files to lubm20 folder

Answer 1

I used rdf2rdf instead of jena

java -jar rdf2rdf-1.0.1-2.3.1.jar /lubmData/lubm100/*.owl lubm100.nt

worked like a charm

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