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。
2
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。
3
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.