Then, the theories of DDM is fully explained in the paper, including the description of DDM, the denotation and operation of domain relation, and the access control method based on DDM.

接着，介绍了域数据模型的一般概念，包括域数据模型的描述、域关系的表示和运算、基于域数据模型的访问控制方法等。

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Professor Hu Guoding proposed a method of measuring information based on the philosophy that connotation and denotation of a concept satisfies inverse ratio rule.

胡国定教授基于“概念的内涵与外延的反比例关系律”这种思想，给出了一种信息度量方法。

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