1.1. Notational Conventions

本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", 和 "OPTIONAL" 只有在如本文所示以全大写形式出现时, 才应按照 BCP 14 [RFC2119] [RFC8174] 中的描述解释.

本规范使用 [STRUCTURED-FIELDS] 中的以下术语: List, String, 和 Parameter.