1.1. Requirements Language (要件言語)

本ドキュメント中のキーワード "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", "OPTIONAL" は, ここに示すとおりすべて大文字で現れる場合に限り, BCP 14 [RFC2119] [RFC8174] に記載されるとおりに解釈される.