In This paper, we suggest a new term IODB (Intensional object oriented database) to represent a certain kind of class in object oriented databases.

为提高对象数据库的表达能力，该文提出了一种新的对象概念——内涵对象(IODB)。

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Although object databases can seem somewhat exotic, they are a useful tool for users of dynamic, object-oriented languages.

尽管对象数据库似乎有点新奇，但它们对于面向对象的动态语言的用户非常有用。

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For all these reasons, schema evolution is a very important topic that has been researched in the context of relational, object-oriented, and XML databases.

由于上述这些原因，模式演化作为一项重要课题需要在关系、面向对象和XML数据库环境中加以研究。

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