update 2.21 Protocols
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# 协议
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# 协议
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-----------------
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本页包含内容:
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本页包含内容:
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- [协议的语法(Protocol Syntax)](#protocol_syntax)
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- [协议的语法(Protocol Syntax)](#protocol_syntax)
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- [对属性的规定(Property Requirements)](#property_requirements)
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- [对属性的规定(Property Requirements)](#property_requirements)
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