old_contents: #
  from rdflib.plugin import register
  from rdflib.serializer import Serializer
  from rdflib.parser import Parser
  import re
  
  # Fix rdflib's ntriples parser
  from rdflib.plugins.parsers import ntriples
  ntriples.litinfo = r'(?:@([a-z]+(?:-[a-zA-Z0-9]+)*)|\^\^' + ntriples.uriref + r')?'
  ntriples.r_literal = re.compile(ntriples.literal + ntriples.litinfo)
  
  register('nt', Serializer, 'pymantic.serializers', 'NTSerializer')
  register('nq', Serializer, 'pymantic.serializers', 'NQSerializer')
  register('nq', Parser, 'pymantic.parsers', 'NQParser')
  
  content_type_to_rdflib_format = {
      'text/plain': 'nt',
      'text/x-nquads': 'nq',
      'application/rdf+xml': 'xml',
      'text/turtle': 'turtle',
  }
  
  rdflib_format_to_content_type = dict((value, key) for key, value in\
                                       content_type_to_rdflib_format.iteritems())
  
new_contents: #
  from rdflib.plugin import register
  from rdflib.serializer import Serializer
  from rdflib.parser import Parser
  import re
  
  # Fix rdflib's ntriples parser
  from rdflib.plugins.parsers import ntriples
  ntriples.litinfo = r'(?:@([a-z]+(?:-[a-zA-Z0-9]+)*)|\^\^' + ntriples.uriref + r')?'
  ntriples.r_literal = re.compile(ntriples.literal + ntriples.litinfo)
  
  register('nt', Serializer, 'pymantic.serializers', 'NTSerializer')
  register('nq', Serializer, 'pymantic.serializers', 'NQSerializer')
  register('nq', Parser, 'pymantic.parsers', 'NQParser')
  
  content_type_to_rdflib_format = {
      'text/plain': 'nt',
      'text/x-nquads': 'nq',
      'application/rdf+xml': 'xml',
      'text/turtle': 'turtle',
      'text/rdf+n3': 'n3',
  }
  
  rdflib_format_to_content_type = dict((value, key) for key, value in\
                                       content_type_to_rdflib_format.iteritems())
  
subject: Expand rdflib to content-type mapping.