在CMv8中并不要求必须定义用户组，但是通过定义用户组可以简化管理，尤其是在定义访问控制列表(Access Control List,ACL)的时候。
It is not necessary to define user groups in CM V8, but it simplifies administration, especially when you define Access Control Lists (ACLs).
提取的元数据包括一些数据模型对象，例如项目类和它们的属性，还有一些管理对象，例如用户定义和访问控制列表。
The extracted metadata includes data model objects, such as item types and their attributes, and administration objects, such as user definitions and access control lists.
管理员配置分配给每个过程的访问控制列表，这样就存在定义该过程中谁能够做什么的业务控制。
The administrator configures an access control list that is assigned to each process, so that there is a business control to define who can do what in which process.
访问控制列表为用户和用户组定义了对特定CM实体的访问级别。
Access Control Lists define the level of access on a particular CM entity for users and user groups.
访问控制列表为用户和用户组定义了对特定CM实体的访问级别。
Access Control Lists define the level of access on a particular CM entity for users and user groups.
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