MicroStation开发语言（MDL）应用教程，MDL是MicroStation的“应用引擎”，可以直接在MicroStation中运行，并且表现为MicroStation本身的一部分。-MicroStation Development Language (MDL) application tutorial, MDL is MicroStation' s " application" engine, can run in MicroStation and MicroS

Microstation二次开发非常难得的学习材料，希望对学习图形开发的人员有所帮助。-Microstation secondary development of learning materials is very rare, and I hope to learn a graphical development staff helpful