我们以前曾解释过，XMPP是随着即时消息兴起的一种实时通讯协议(link)。

As we've explained in the past, XMPP is a real-time communication protocol popularized by Instant Messaging.

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对于那些使用XML作为消息传递协议而非表示文档内容的那些应用程序尤其重要，比如Web服务或即时消息应用程序。

This is of particular importance to a class of applications that use XML as a messaging protocol rather than to represent document content, such as Web Services or Instant messaging applications.

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Lotus Instant Messaging(即时消息，原来的Sametime)现在也支持Session Initiation Protocol(会话发起协议，SIP)，在已有的通信方法上增加了一种传输机制。

Lotus Instant Messaging (formerly Sametime) now supports Session Initiation Protocol (SIP) as a transport mechanism in addition to its proprietary communication method.

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