从广义角度来说，数据库管理系统(DBMS)在历史上划分成三种类型：层次、关系和面向对象。

In broad themes, database management systems (DBMSs) have historically been of three types: hierarchical, relational, and object-oriented.

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一个数据源可以四像关系型数据库管理体统这样的数据库,可以是面向对象型的数据库管理系统,可以是XML文档,也可以是简单文件等等.

A data source could be a database such as an RDBMS, OODBMS, XML repository, flat file system, and so forth.

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ZODB是一个健壮的、多用户的和面向对象的数据库系统，它能够存储和管理任意复杂的Python对象，并支持事务操作和并发控制。

ZODB is a robust, multi-user, object-oriented database system capable of storing and managing arbitrarily complex Python objects with transaction support and concurrency control.

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