[semidet,multifile]event_to_json(+Event,
-JSONTerm, +Lang)Hook that translates a Pengine event structure into a term suitable for reply_json/1,
according to the language specification Lang. This can be
used to massage general Prolog terms, notably associated with
success(ID, Bindings, Projection, Time, More)
and output(ID, Term)
into a format suitable for processing at the client side.