old_contents: from sys import version_info
  if version_info[0:2] > (2, 2):
      from unicodedata import normalize
  else:
      normalize = None
  
  from rdflib.Identifier import Identifier
  from rdflib.exceptions import Error
  
  import rdflib
  
  class Literal(Identifier):
      """
  
      http://www.w3.org/TR/rdf-concepts/#section-Graph-Literal
      """
      
      def __new__(cls, value, lang='', datatype=''):
          value = unicode(value)        
          return Identifier.__new__(cls, value)        
  
      def __init__(self, value, lang='', datatype=''):
          if normalize and value:
              if not isinstance(value, unicode):
                  value = unicode(value)
              if value != normalize("NFC", value):
                  raise Error("value must be in NFC normalized form.")
          
          if datatype:
              lang = ''
          self.language = lang
          self.datatype = datatype
          
      def __add__(self, val):
          s = super(Literal, self).__add__(val)
          return Literal(s, self.language, self.datatype)
      
      def n3(self):
          language = self.language
          datatype = self.datatype
          if language:
              if datatype:
                  return '"%s"@%s^^<%s>' % (self, language, datatype)
              else:
                  return '"%s"@%s' % (self, language)
          else:
              if datatype:
                  return '"%s"^^<%s>' % (self, datatype)
              else:
                  return '"%s"' % self
  
  
      def __eq__(self, other):
          if other==None:
              return 0
          elif isinstance(other, Literal):
              result = self.__cmp__(other)==0
              if result==1:
                  if self.language==other.language:
                      return 1
                  else:
                      return 0
              else:
                  return result
          elif isinstance(other, Identifier):
              return 0
          else:
              return unicode(self)==other
  
  
new_contents: from sys import version_info
  if version_info[0:2] > (2, 2):
      from unicodedata import normalize
  else:
      normalize = None
  
  from rdflib.Identifier import Identifier
  from rdflib.exceptions import Error
  
  
  class Literal(Identifier):
      """
  
      http://www.w3.org/TR/rdf-concepts/#section-Graph-Literal
      """
      
      def __new__(cls, value, lang='', datatype=''):
          value = unicode(value)        
          return Identifier.__new__(cls, value)        
  
      def __init__(self, value, lang='', datatype=''):
          if normalize and value:
              if not isinstance(value, unicode):
                  value = unicode(value)
              if value != normalize("NFC", value):
                  raise Error("value must be in NFC normalized form.")
          
          if datatype:
              lang = ''
          self.language = lang
          self.datatype = datatype
          
      def __add__(self, val):
          s = super(Literal, self).__add__(val)
          return Literal(s, self.language, self.datatype)
      
      def n3(self):
          language = self.language
          datatype = self.datatype
          if language:
              if datatype:
                  return '"%s"@%s^^<%s>' % (self, language, datatype)
              else:
                  return '"%s"@%s' % (self, language)
          else:
              if datatype:
                  return '"%s"^^<%s>' % (self, datatype)
              else:
                  return '"%s"' % self
  
  
      def __eq__(self, other):
          if other==None:
              return 0
          elif isinstance(other, Literal):
              result = self.__cmp__(other)==0
              if result==1:
                  if self.language==other.language:
                      return 1
                  else:
                      return 0
              else:
                  return result
          elif isinstance(other, Identifier):
              return 0
          else:
              return unicode(self)==other
  
  
subject: remove unused import