1.1. Requirements Language (规范性用语)

本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", "OPTIONAL" 按 BCP 14 [RFC2119] [RFC8174] 所述解释, 且仅当它们以全大写形式出现时适用.