本文提供了定制数据库过程的一步步的细节内容，并且包括一些如何对某些字段控制访问权限的钩子函数。

It provides step-by-step details on the procedure for customizing your database, and includes some hooks on how to control access rights to certain fields.

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文档访问由一个或多个Readers字段控制，在创建和修改文档时，这些Readers字段是作为文档的一部分保存的。

Document access is controlled by one or more Readers fields that are saved as part of a document when it is created or modified.

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表 1 显示了 Boolean 字段，该字段控制哪种类型的节点能够调用访问程序的 visit() 方法。

Table 1 shows the Boolean fields that control which types of nodes are allowed to call the visitor's visit() method.

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