Both the author and contributor elements are fully extensible, allowing content producers to provide as much detail about the author or contributor as they deem appropriate.
author和contributor元素都是可扩展的，只要自己认为合适，内容的生产者可以提供关于作者或者参与者更详细的信息。
Appropriate access permissions can be defined to a place according to predefined roles such as Manager, Editor, Contributor, and Reader.
依据预定义的角色，比如Manager、Editor、Contributor和Reader，一些适当的访问权限可被定义到一个位置。
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