Availability:
:- use_module(library(semweb/rdf_ntriples)).
[det]read_nquad(+Stream, 
-Quad)| Quad | is a term quad(Subject,Predicate,Object,Graph). 
Arguments follow the normal conventions of the RDF libraries. NodeID 
elements are mapped to node(Id). If end-of-file is reached, Quad 
is unified with
end_of_file.  | 
- Errors
 syntax_error(Message)on syntax errors