The SOAP mustUnderstand attribute is used to indicate whether a header entry is mandatory or optional.
SOAP mustUnderstand 属性用于指出一个头条目是必选的还是可选的。
You can specify whether prime words, class words, and modifiers are mandatory or optional, and the order in which these elements should occur.
可以指定基本单词、类单词和修饰词是必需的还是可选的，以及这些元素出现的次序。
The type of phase calls out which workflows are mandatory or optional and a weight that indicates the amount of effort expended on that workflow relative to the others.
阶段的类型决定哪些工作流是强制性的，哪些是可选的，并使用权重来指示该工作流相对于其他工作流所需的工作量。
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