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 selection system may choose to set out to finalize the booking. The real world is complex, only this element of the system is can not meet the requirements.