text: from yowsup.structs import ProtocolEntity, ProtocolTreeNode
  from .iq_group import GroupsIqProtocolEntity
  class ParticipantsGroupsIqProtocolEntity(GroupsIqProtocolEntity):
      '''
      <iq type="get" id="{{id}}" xmlns="w:g", to={{group_jid}}">
          <list></list>
      </iq>
      '''
      def __init__(self, jid, _id = None):
          super(ParticipantsGroupIqProtocolEntity, self).__init__(_to = jid, _id = _id, _type = "get")
  
      def toProtocolTreeNode(self):
          node = super(ParticipantsGroupsIqProtocolEntity, self).toProtocolTreeNode()
          node.addChild(ProtocolTreeNode("list",{}))
  
      @staticmethod
      def fromProtocolTreeNode(node):
          entity = GroupsIqProtocolEntity.fromProtocolTreeNode(node)
          entity.__class__ = ParticipantsGroupsIqProtocolEntity
  