WPF编程元素彼此之间通常以某种形式的树关系存在。
WPF programming elements often exist in some form of tree relationship to each other.
如果错误元素是存在的，那它肯定以主体元素的子元素形式出现。错误元素只能在SOAP元素中出现一次。
If a Fault element is present, it must appear as a child element of the Body element. A Fault element can only appear once in a SOAP message.
如果错误元素是存在的，那它肯定以主体元素的子元素形式出现。错误元素只能在SOAP元素中出现一次。
If a Fault element is present, it must appear as a child element of the Body element. A Fault element can only appear once in a SOAP message.
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