docs: def import_users(self, users):
          """ Import users, returns import result (http://confluence.jetbrains.net/display/YTD2/Import+Users)
              Example: importUsers([{'login':'vadim', 'fullName':'vadim', 'email':'eee@ss.com', 'jabber':'fff@fff.com'},
                                    {'login':'maxim', 'fullName':'maxim', 'email':'aaa@ss.com', 'jabber':'www@fff.com'}])
          """
          if len(users) <= 0:
              return
  
          known_attrs = ('login', 'fullName', 'email', 'jabber')
  
          xml = '<list>\n'
          for u in users:
              xml += '  <user ' + "".join(k + '=' + quoteattr(u[k]) + ' ' for k in u if k in known_attrs) + '/>\n'
          xml += '</list>'
          # TODO: convert response xml into python objects
          if isinstance(xml, str):
              xml = xml.encode('utf-8')
          return self._req_xml('PUT', '/import/users', xml, 400).toxml()