The lesson can be generalized as follows: a method for associating the attributes of elements with external reference points might have value.

这一经验可以推广为：用外部引用指针关联元素的属性可能是有用的。

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Each Reference element includes the digest method and resulting digest value calculated over the identified data object.

每个Reference元素都包括摘要方法和对已识别资料资料物件计算得出的摘要值。

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The get() method of AppConfig can be used to get the value of an individual parameter; because the parameters of interest are always array references, I automatically de-reference them.

AppConfig 的 get() 方法可以用来得到各个参数的值；由于感兴趣的参数总是数组引用，我自动地对它们进行解引用。

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