如果一个特定于用户的映像组合没有以映像的形式出现，那么经过授权的用户则可以灵活地从vcl库组件中构建自己的映像。
If a user specific image combination is not already available as an image, an authorized user can have the flexibility to construct their own image from the VCL library components.
有能力完成端到端的认证和授权是进行真正的分布式、跨组织组合应用的关键所在。
The ability to do end-to-end authentication and authorization is key to doing real distributed, multi-org composite apps.
用户的授权一般是用户名和密码的组合。
The key used by users is usually a combination of username and password.
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