1。主要功能用svg画出北京的部分地铁线路，xml存放数据，用xsl生成svg图。

2。可实现对两站之间最短路径的查询，主要用Javascr ipt编写。-1. Main function of the part with the svg drawing Beijing subway line, xml store data generated using xsl svg map. 2. Can realize the shortest path between two stations inquiries, primarily written with Javascr ipt.