如果不使用WSIT特性，则WSDL是可选的；在这种情况下，WSDL将在运行时自动生成。
This WSDL is optional if you're not using WSIT features, in which case a WSDL will be generated automatically at run time.
声明部分也是可选的；如果没有使用- t选项调用gperf，则完全可以忽略声明部分。
The declarations section is also optional; you can omit it entirely if you don't invoke gperf with the -t option.
TCPMon（可选）——如果能实际看到消息，则更容易理解 Web 服务应用程序内的运行情况。
TCPMon (optional) -- It's always easier to understand what's going on in a web service application when you can actually see the messages.
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