1.1. Requirements Notation and Conventions (需求表示法和约定)

本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY" 和 "OPTIONAL" 应按照BCP 14 [RFC2119] [RFC8174] 中的描述进行解释, 当且仅当它们以全大写形式出现时, 如此处所示。