一旦开始创建文档，将需要一个写入器向文档中写入内容。

Once the document is created, we would require a writer to write into it.

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这样可以更加灵活地向归档添加文件，可以通过引用现有文件或动态构建文件实现。

This provides a bit of flexibility on how to add a file to an archive, by either referencing an existing file or building a file on the fly.

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图4显示了一个文件夹acl，它向rpc主体提供创建文件和删除文件权限，还提供一个附加权限：读取文件夹中的文件的能力。

Figure 4 shows a folder ACL that gives the RPC principal the create file and delete file permissions, plus one additional permission: the ability to read files in the folder.

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