get a fresh blank node notes: couldn‘t see how to have Node.getResource() work

Get a Node given its URI, recycling where available

constructor (make this private? use get* instead) N-Triples parser seems to still be using this. @@todo

wrap literals in quotes, data in <> blanks in ??? for NTriples/N3 export

catch missing method calls, assume they‘re rdf property queries todo: think about error handling; what would be sane here?

a stringified node doesn‘t include ’"’ around literals (genids? @@ISSUE)

unicode encoding for XML output