约束facet是一种构造，可以在派生期间使用它们控制简单类型的值空间。

A constraining facet is a construct that you can use to control the value space of simple type during derivation.

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派生表的构造方法如下。

The derived table is constructed as follows.

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构造 InitialContext 后，它可以从环境（系统特性或 applet 参数）派生 JNDI 参数值或查找特定 jndi.properties 文件。

When the InitialContext is constructed, it may derive the JNDI parameter values from the environment (system properties or applet parameters) or it may look for a specific jndi.properties file.

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