choice 数据类型描述了这样一个结构，其中只有一个子元素可以是活动的或者可供选择。
The xsd:choice data type describes a structure in which only one of its child elements can be active or selected.
这类框架的起点是描述文档数据类型的XML方案。
The starting point for any of these frameworks is an XML schema that describes the data types of your documents.
WSDL文件只是描述数据类型，包括数据类型的名字、操作和功能等，但并没有描述数据类型的意义。
A WSDL file only describes the data types, as well as the name of data types and the operations or functions and so on, but does not describe the meaning of the data type.
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