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

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。

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Existing multimedia data models such as the of multimedia data model based on the of Non First Normal Form (NF2), object oriented data models and hyper media data models do not meet the needs of MGIS.

但现有的几种多媒体数据模型(NF 2模型、面向对象模型和超媒体模型等)尚不能满足MGIS数据管理的要求。

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Based on the Characteristics of multimedia database, the basic framework of user view applicable to multimedia database is advanced in the light of object oriented method.

根据多媒体数据库的特点，结合面向对象方法，提出一个适用于多媒体数据库用户视图的基本框架。

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