将XML文件模拟成一个数据库，通过程序可以首先建立一个XML文件（相当于建立了一个数据库），之后可以实现查找，删除，添加，修改等功能。-XML documents will be simulated into a database, through the process could begin to build a XML document (equivalent to the establishment of a database), can be achieved after the search, delete, add, modify functions.