2. Terminology

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

术语 "UTF-8 string" 或 "UTF-8 character" 用于指代以 UTF-8 [RFC3629] (一种标准 Unicode Encoding Form) 表示的 Unicode 字符, 这些字符可能属于或不属于 ASCII 子集.