XMPP协议（Extensible Messaging and PresenceProtocol，Extensible Message Processing Protocol）是一种基于XML的协议，是为了解决实时通信标准而提出的，最早是在Jabber上实现的。它继承了在 XML 环境中开发的灵活性。因此，基于 XMPP 的应用程序具有高度可扩展性。而且 XML 可以轻松通过防火墙，因此使用 XMPP 构建的应用程序不太可能被防火墙阻止。使用 XMPP 作为通用传输机制，不同组织中的不同应用程序可以进行有效的通信。
(XMPP protocol (extensible messaging and presenceprotocol, extensible message processing protocol) is a protocol based on XML. It was proposed to solve the real-time communication standard and was first implemented on jabber. It inherits the flexibility of developing in an XML environment. Therefore, XMPP based applications are highly scalable. And XML can easily pass through the firewall, so applications built with XMPP are unlikely to be blocked by the firewall. Using XMPP as a common transport mechanism, different applications in different organizations can communicate effectively.)
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