2. 约定
本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY" 和 "OPTIONAL" 应按 RFC 2119 [RFC2119] 中的说明解释.
本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY" 和 "OPTIONAL" 应按 RFC 2119 [RFC2119] 中的说明解释.