dajobe/raptor — pull request #16 by rhmccullough (2014-10-19 17:25:13+00:00)
Title: do not change "( )" to "rdf:nil"

In tests/turtle:
rapper -i turtle -o turtle test-08.ttl
changes "( )" to "rdf:nil".
This change to src/raptor_serialize_turtle.c will produce "( )" in the
output file.