SOAP messages typically travel over an HTTP transport, the standard network protocol for Web applications, which is what you'll use in this book.
SOAP消息通常通过HTTP传输协议传递，HTTP是用于网络应用程序的标准网络协议，您在本文中就将使用这一协议。
Protocol buffers supports optional, required and repeated fields. An example of an address book message definition using protocol buffers would look like this.
Protocol buffers支持可选的，必需的和重复的字段。
But the difference of book Circulation Protocol brings great difficulties to the integration of book management systems and self-service equipments in libraries.
不同的图书流通交换协议之间的差异给图书流通管理系统以及自助借还设备之间的集成带来了难度。
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