系统功能: (1)设计组件重用(Reuse of design components)
(2)简易的设计修改和版本控制功能(Ease of design modification and versioning)
(3)设计的标准组件的自动产生(Automatic generation of standard components of the design)
(4)设计是否满足要求和实际规则的检验(Validation/verification of designs against specifications and design rules) ......