raptor_serializer_start_to_filename()
raptor_serializer_start_to_string()
raptor_serializer_start_to_file_handle()
raptor_serializer_start_to_iostream()
The typical sequence of operations to serialize is to create a serializer object, set various callback and features, start the serializing, send some RDF triples to the serializer object, finish the serializing and destroy the serializer object.