列车票务系统的主要任务是:售票员根据旅客的信息查询现有的列车资源,之后人工的选择系统列出的可能选择最后完成售票.而现实世界是复杂的,仅有这一点功能的系统是不能满足要求的.-Train ticketing system is the main task: the conductor of the passenger information in accordance with the existing resources of the train, followed by artificial s