系统设计采用面向对象数据模型，数据库结构采用面向对象关系数据库系统。

The Object-Orient Data Model and the Object-Relative Database System(ORDBS) are adapted in the system structure for design and development.

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NHMDB是基于扩充关系数据模型的多媒介数据库系统，它以扩充关系为基础支持面向对象的主要特性。

NHMDB is a multimedia database system based on the extended relational data model and has the characteristics of object-oriented databases.

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NHMDB是基于扩充关系数据模型的多媒介数据库系统，它以扩充关系为基础支持面向对象的主要特性。

NHMDB is a multimedia database system based on the extended relational data model and has the characteristics of object-oriented databases.

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