JSON-LD reader not reading namespace prefixes

[Andy Seaborne]

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) ;
}