Chris Mungall created JENA-2099:
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Summary: Converting rdfstar to plain rdf formats do not work
Key: JENA-2099
URL: https://issues.apache.org/jira/browse/JENA-2099
Project: Apache Jena
Issue Type: Bug
Components: RIOT
Affects Versions: Jena 3.17.0
Reporter: Chris Mungall
Given a file ex1.ttl
{code:java}
@prefix : <http://www.example.org/> .
:employee38 :familyName "Smith" .
<< :employee38 :jobTitle "Assistant Designer" >> :accordingTo :employee22 .
{code}
my expectation is that I should be able to use riot to serialize as plain rdf,
ttl, ntriples, rdf-xml, and json-ld, with reification used (I cannot find a
normative statement in the spec to support this but I hold it's a reasonably
user expectation given what has been written about rdfstar by the authors of
the spec).
This doesn't work however:
{code:java}
$ riot --out=jsonld ex1.ttl
org.apache.jena.riot.RiotException: Subject node is not a URI or a blank node
at
org.apache.jena.riot.writer.JenaRDF2JSONLD.parse(JenaRDF2JSONLD.java:64)
at
org.apache.jena.riot.writer.JsonLDWriter.toJsonLDJavaAPI(JsonLDWriter.java:200)
at
org.apache.jena.riot.writer.JsonLDWriter.serialize(JsonLDWriter.java:174)
at org.apache.jena.riot.writer.JsonLDWriter.write(JsonLDWriter.java:135)
at org.apache.jena.riot.writer.JsonLDWriter.write(JsonLDWriter.java:141)
at org.apache.jena.riot.RDFWriter.write$(RDFWriter.java:208)
at org.apache.jena.riot.RDFWriter.output(RDFWriter.java:166)
at org.apache.jena.riot.RDFWriter.output(RDFWriter.java:113)
at
org.apache.jena.riot.RDFWriterBuilder.output(RDFWriterBuilder.java:204)
at
riotcmd.CmdLangParse.lambda$createAccumulateSink$0(CmdLangParse.java:348)
at riotcmd.CmdLangParse.exec$(CmdLangParse.java:172)
at riotcmd.CmdLangParse.exec(CmdLangParse.java:130)
at jena.cmd.CmdMain.mainMethod(CmdMain.java:92)
at jena.cmd.CmdMain.mainRun(CmdMain.java:58)
at jena.cmd.CmdMain.mainRun(CmdMain.java:45)
at riotcmd.riot.main(riot.java:29)
{code}
similarly for export to rdfxml
When I convert to turtle, the syntax remains turtlestar:
{code:java}
$ riot --out=ttl ex1.ttl
@prefix : <http://www.example.org/> .
:employee38 :familyName "Smith" .
<< :employee38 :jobTitle "Assistant Designer" >>
:accordingTo :employee22 .{code}
I'm not totally sure if this is what should happen. I'm not totally sure of
what the different file format options are, and if there is a distinct
"turtlestar" and "ntriplesstar" (as an aside, it would be useful to have more
command line help on permissible values for input and output formats in riot).
My expectation is that parsing should be lenient as should accept *star
syntaxes, but allow fine-grained control in output as to whether plain rdf
syntax or *star syntaxes are used (with expansion to reification happening in
the latter), but I may be using riot incorrectly.
FWIW, explicitly using reification doesn't syntactically convert to rdfstar,
e.g. with ex1r.ttl:
{code:java}
@prefix : <http://www.example.org/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
:employee38 :jobTitle "Assistant Designer" .
[a rdf:Statement ;
rdf:subject :employee38 ;
rdf:predicate :jobTitle ;
rdf:object "Assistant Designer" ;
:accordingTo :employee22
] .
{code}
I can't seem to convert this into rdfstar syntax using riot
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