什么是对象？
. 文档，文件柜，文件夹，用户，组等在docbase中存储的一切都是对象。
. 每个对象都拥有属性(properties) 和方法(methods)
- 属性被用来描述一个对象
- 方法被用来描述可以在对象上执行的动作
例子 ： dm_document 对象
什么是对象类型？
. 对象类型是一种预定义的模板，用来描述具有相同属性和方法的一类对象
. 每个对象都是一种对象类型的实例
. 所有对象都属于某种对象类型
. 对象类型具有集成关系，子类型集成父类型的所有属性.
documentum 对象类型
Persistent Object Properties
持久对象类型有3个属性传递给它的子类型
. r_object_id 表示一个对象的标示，由服务器在对象生成的时候创建，它是唯一的，也不可以被修改。
. i_is_replica 指示对象是否是远程仓库的一个本地拷贝
. i_vstamp 用作锁定和版本控制
r_object_id组成
类型存储
Content Server把对象类型的属性存储在下面2张表中
- name_of_type_s 存储对象的single_valued 属性
- name_of_type_r 存储对象的repeating_valued 属性
- 大小: 21.3 KB
- 大小: 57.8 KB
- 大小: 40.8 KB
- 大小: 39.9 KB
- 大小: 19.8 KB
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