docs: def getContactTypes(self):
          """
          Return an iterator of L{IContactType} providers available to this
          organizer's store.
          """
          yield VIPPersonContactType()
          yield EmailContactType(self.store)
          yield PostalContactType()
          yield PhoneNumberContactType()
          yield NotesContactType()
          for getContactTypes in self._gatherPluginMethods('getContactTypes'):
              for contactType in getContactTypes():
                  self._checkContactType(contactType)
                  yield contactType