linux下xml文件的读写操作封装，简洁明了。-xml files under linux to read and write operations package, simple and concise.

ezxml移植到stm32f103, fatfs文件系统打开文件，动态内存缓存文件，然后解析数据(Ezxml is transplanted to stm32f103, FatFs file system opens files, dynamic memory caches files, and parses data)