2. 约定和定义 (Conventions and Definitions)
本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY" 和 "OPTIONAL" 在且仅在以这里所示的全大写形式出现时, 应按 BCP 14 [RFC2119] [RFC8174] 中的描述解释.
本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY" 和 "OPTIONAL" 在且仅在以这里所示的全大写形式出现时, 应按 BCP 14 [RFC2119] [RFC8174] 中的描述解释.