This enables primitives (custom or pre-built) to access the message in a uniform way, regardless of the protocol that was used to send it.

这样，原语(自定义或预置)就能够以统一的方式访问消息，而不受用于发送消息的协议的影响。

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The pre-process logic includes the message security, followed by formatting the input based on protocol and performing the task.

预处理逻辑包括消息安全性，以及基于协议对输入进行格式化和执行任务。

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All too often, that's something predetermined either by the server-side developers or, in most cases, by hooking into a pre-existing Web service that only supports a specific protocol.

很多情况下，这是由服务器端开发人员预先确定好的，也可能挂钩预先存在的web服务，而该服务只支持某种特定的协议。

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"One need only see what transpired with the iPod and its impact on CD purchases as well as other historical transformations such as digitizing records, Internet sales, online media, et cetera, for pre-existing protocol, " says Matt Lloyd, chief investment strategist of Advisors Asset Management.

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