old_contents: from .helpers.popolo_fields import simple_fields
  
  SIMPLE_POPOLO_FIELDS = simple_fields
  
new_contents: from enum import Enum, unique
  
  from .helpers.popolo_fields import simple_fields
  
  SIMPLE_POPOLO_FIELDS = simple_fields
  
  
  @unique
  class PersonIdentifierFields(Enum):
      email = "Email"
      facebook_page_url = "Facebook Page"
      facebook_personal_url = "Facebook Personal"
      homepage_url = "Homepage"
      linkedin_url = "Linkedin"
      party_ppc_page_url = "Party PPC Page"
      twitter_username = "Twitter"
      wikipedia_url = "Wikipedia"
      # party_candidate_page = "Party Candidate Page"
      # other = "Other"
  
subject: Add Enum for PersonIdentifier Fields