XMPP core specification: See the complete definition of XMPP.
XMPP核心规范：查看完整的XMPP定义。
There is currently no defined extension mechanism in the core Blueprint specification.
目前在核心blueprint规范中没有定义好的扩展名机制。
There is currently no defined extension mechanism in the core Blueprint specification.
目前在核心blueprint规范中没有定义好的扩展名机制。
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