I figured out the problem, it was two-fold: 1 - We weren't passing the options correctly to the JsonLDReader so namespaces weren't extracted 2 - JsonLDWriter passed the default namespaces in such a way that it wouldn't round trip
Should now be fixed in trunk and the tests are updated to include checking namespace round tripping Rob On 22/05/2014 14:06, "Rob Vesse" <[email protected]> wrote: >Huh that is strange, certainly when I applied the equivalent fix to their >code on GitHub I did get prefixes back out > >I will take a look at what's going on > > >Rob > >On 22/05/2014 13:29, "Andy Seaborne" <[email protected]> wrote: > >>Rob, >> >>The fix looks exactly right but when I tried it I didn't get an prefixes. >> >>Putting a breakpoint in JsonLDReader, I don't see the dataset (from >>jsonld-java) having any namespaces set (the entrySet exists and is >>empty). >> >>The @context is making the URIs come out right, but nothing in the given >>com.github.jsonldjava.core.RDFDataset object. (using v0.4 of >>jsonld-java). >> >>Did you have a working example? >> >> Andy >> >> public static void main(String... argv) throws Exception { >> // From TR/json-ld spec, example 19. >> String x = StrUtils.strjoinNL >> ("{ \"@context\":" >> ," { \"foaf\": \"http://xmlns.com/foaf/0.1/\"; } ," >> ," \"@type\": \"foaf:Person\" ," >> ," \"foaf:name\": \"Rob\"" >> ,"}" >> ) ; >> >> System.out.println(x) ; >> >> Model m = ModelFactory.createDefaultModel() ; >> RDFDataMgr.read(m, new StringReader(x), null, Lang.JSONLD) ; >> System.out.println("Prefix map:"+ m.getNsPrefixMap()) ; >> System.out.println() ; >> RDFDataMgr.write(System.out, m, Lang.TTL) ; >>} >> > > > >
