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Raptor can use namespace prefix/URIs to abbreviate syntax
in some syntaxes such as Turtle or any XML syntax including RDF/XML,
RSS1.0 and Atom 1.0.  These are declared 
with raptor_serializer_set_namespace()
using a prefix and URI argument pair like this:
const unsigned char* prefix = "ex"; raptor_uri* uri = raptor_new_uri(world, "http://example.org"); raptor_serializer_set_namespace(rdf_serializer, prefix, uri);
or
raptor_serializer_set_namespace_from_namespace()
from an existing namespace.  This can be useful when connected up the
the namespace declarations that are generated from a parser via a
namespace handler set with
raptor_parser_set_namespace_handler()
  static void
  relay_namespaces(void* user_data, raptor_namespace *nspace)
  {
    raptor_serializer_set_namespace_from_namespace(rdf_serializer, nspace);
  }
  ...
  rdf_parser = raptor_new_parser(world, syntax_name);
  raptor_parser_set_namespace_handler(rdf_parser, rdf_serializer, relay_namespaces);