The core mechanism of MSDP is map symbol render components and draw components, functions of which are getting point, line and region symbols from CMSL, and then drawing on various GIS maps.

• 当在不同的GIS环境里进行地图符号化时，分别调用相应的渲染组件和绘制组件，实现通用地图符号库在不同GIS地图上的显示和地图符号信息的共享。