【摘要】 本文从一个实例着手说明了对象库中对象的次序关系对迭代消息传递的重要性，从而论证了对象集合不能作为对象库的基本聚集结构．文中以对象序列取代对象集合，并用代数规范定义了ＯＯＤＢ状态、聚集、类和迭代消息传递等概念更多还原

【Abstract】 This paper demonstrates the importance of orders in object bases to iterative message passing with a case study, and comes to the conclusion that collections in OODBs can not be simply treated as sets It is proposed that collections should be sequences of objects The concepts of OODB state, collection, class and iteration are defined in terms of algebraic specifications更多还原