通过节点数据类型以及它所支持的函数，可以在关系数据库中表示分层数据。

The node data type, with its supporting functions, gives you the ability to represent hierarchical data within the relational database.

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用分层的方法协调函数。

Orchestrating functions with the layered approach.

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对于分层配置，AppConfig需要安装有定制函数，以解释不止一层深的散列。

For layered configurations, AppConfig needs to have custom functions installed to interpret hashes deeper than one level.

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