端口类型就是命名了的一组抽象操作和涉及到的消息集合。
A port type is a named set of the abstract operations and messages involved.
binding：将抽象的端口类型与其消息和操作绑定到传输协议和消息格式。
Binding: Binds the abstract port type, along with its messages and operations, to a transport protocol and message format.
随着上述两种端口类型之间的一些引用的增加，到目前为止，WSDL文档已经从具体和实际形式(数据类型)转变为抽象和逻辑形式(消息和端口类型)。
The WSDL document so far has moved from the concrete and physical (data typing) to the abstract and logical (messages and port types), with some reference between the two.
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