通过结合身份验证和传输中的数据保护，XMPP可以应用在不同的层次，而且可以作为一个理想的中间件协议。
Along with authentication and in-transit data protection, XMPP can be applied at a variety of levels and is ideal as a middleware protocol.
一个性能需求指定了性能可接受的限值，并帮助您确认服务层次的协议。
A performance requirement specifies acceptable thresholds of performance and helps validate service level agreements.
我们经常期望esb能够对各个层次的协议进行转换，以方便提供者和使用者之间的通信。
More often than not, an ESB is expected to convert the protocols at various layers to ease communication between the provider and the consumer.
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