SDL语言中的面向对象概念

Object Oriented Characteristic in SDL

介绍ＳＤＬ语言最新版本中的面向对象语言机制，探讨与此相关的概念及其使用方法。在分析类型与实例在系统规范中的区别和联系的基础上，举例说明类型的定义和使用方法，介绍了在面向对象框架下类型的一般化和专门化概念，最后指出ＳＤＬ语言中面向对象概念的不足之处并提出了相关的改进思想。

This paper provides an overview of the objectorientation feature in SDL92,probes into related concepts and the method to use themWe analyze the difference and relationship between Type and Instance,illustrate how to define and use Type,introduce the concepts of Generalization and Specialization under the concept of Type in SDLSome deficiencies of the objectorientation concept in the current version of SDL are discussed along with some improvement ideas