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2. Notational conventions

RFC 2119 Key Words​

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

UCS Character Notation​

UCS characters are designated by the U+HHHH notation, where HHHH is a string of from 4 to 6 hexadecimal digits representing the character number in ISO/IEC 10646.

Examples​

  • U+0041 - Latin Capital Letter A
  • U+1F600 - Emoji (😀)