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RFC 2119 Requirement Level Keywords
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=== 摘要 === 在許多標準追蹤文件中，會使用若干詞彙來表明規範中的需求。這些詞彙通常以大寫表示。本文件定義了這些詞彙在 IETF 文件中應如何被解讀。遵循這些準則的作者應在其文件開頭附近加入以下語句： 本文件中的關鍵字「MUST」、「MUST NOT」、「REQUIRED」、「SHALL」、「SHALL NOT」、「SHOULD」、「SHOULD NOT」、「RECOMMENDED」、「MAY」和「OPTIONAL」應按照 RFC 2119 中的描述進行解讀。 請注意，這些詞彙的強制力會因其所在文件的需求層級而有所調整。
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