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文中介绍了一个面向对象知识库系统ＣＡＯＢＳ／Ｖ１．２．该系统是在一个面向对象数据库管理系统基础上进行开发的．我们重点研究了面向对象的知识表示、可视查询、问题的推理求解与知识的获取机制．在ＣＡＯＢＳ／Ｖ１．２系统中，问题推理求解采用基于事例的推理，辅之以基于规则的推理模式．我们还开发了一种新型的可视知识查询语言——ＶＫＱＬ，其查询的直观性和方便性均要强于传统的文本查询语言．文中论述了ＣＡＯＢＳ／Ｖ１．２系统的设计思想和各个主要模块的功能，并重点介绍了事例推理器的设计与实现．在最后一节，我们将其与国际上的类似系统进行了比较．
This paper introduces an object - oriented knowledge base system CAOBS / V1.2. The system is based on an object-oriented database management system developed. We focus on the object-oriented knowledge representation, visual query, the problem of reasoning and knowledge acquisition mechanisms. In CAOBS / V1.2 system, problem-based reasoning uses case-based reasoning, supplemented by rule-based reasoning. We also developed a new visual knowledge query language - VKQL, whose query is more intuitive and convenient than the traditional text query language. This paper discusses the design idea of CAOBS / V1.2 system and the function of each main module, and emphatically introduces the design and implementation of case reasoning device. In the last section, we compared it to similar systems in the world.