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Predicate read_ntriple/2
 read_ntriple(+Stream, -Triple) is det
Read the next triple from Stream as Triple. Stream must have UTF-8 encoding.
Triple- is a term triple(Subject,Predicate,Object). Arguments follow the normal conventions of the RDF libraries. NodeID elements are mapped to node(Id). If end-of-file is reached, Triple is unified with end_of_file.
- syntax_error(Message) on syntax errors