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Predicate rdf_process_turtle/3
Availability::- use_module(library(semweb/turtle)).
Source[det]rdf_process_turtle(+Input, :OnObject, +Options)
Streaming Turtle parser. The predicate rdf_process_turtle/3 processes Turtle data from Input, calling OnObject with a list of triples for every Turtle statement found in Input. OnObject is called as below, where ListOfTriples is a list of rdf(S,P,O) terms for a normal Turtle file or rdf(S,P,O,G) terms if the GRAPH keyword is used to associate a set of triples in the document with a particular graph. The Graph argument provides the default graph for storing the triples and Line is the line number where the statement started. 
call(OnObject, ListOfTriples, Graph:Line)

This predicate supports the same Options as rdf_load_turtle/3.

Errors encountered are sent to print_message/2, after which the parser tries to recover and parse the remainder of the data.

See also
This predicate is normally used by load_rdf/2 for processing RDF data.
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Anne Ogborn said (2014-09-14T07:06:59):0 upvotes 0 0 downvotes
Picture of user Anne Ogborn.

OnObject will be passed a list of triples something like this

on_object(TripleList, Graph:LineNo) :-

TripleList would be a list of terms like rdf(S,P,O) (or possibly rdf(S,P,O,G) , apparently)

This from reading code, YMMV.