code: def getRoles(self):
          
  
          # no need to retrieve all the entries from _get_paged_resources
          # role raw data is very simple that contains no other links
  
          self.log.info("Get all the roles in <ProjectArea %s>",
                        self)
          roles_url = "/".join([self.rtc_obj.url,
                                "process/project-areas/%s/roles" % self.id])
          resp = self.get(roles_url,
                          verify=False,
                          proxies=self.rtc_obj.proxies,
                          headers=self.rtc_obj.headers)
  
          roles_list = list()
          raw_data = xmltodict.parse(resp.content)
          roles_raw = raw_data['jp06:roles']['jp06:role']
          if not roles_raw:
              self.log.warning("There are no roles in <ProjectArea %s>",
                               self)
              return None
  
          for role_raw in roles_raw:
              role = Role(role_raw.get("jp06:url"),
                          self.rtc_obj,
                          raw_data=role_raw)
              roles_list.append(role)
          return roles_list
docs: Get all :class:`rtcclient.models.Role` objects in this project
          area
  
          If no :class:`Roles` are retrieved, `None` is returned.
  
          :return: a :class:`list` that contains all
              :class:`rtcclient.models.Role` objects
          :rtype: list