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RFC 2119 Requirement Level Keywords
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=== 5. MAY === 此詞，或形容詞「OPTIONAL」，意指某項目確實是可選的。某個供應商可能因為特定市場需求而選擇包含該項目，或因為供應商認為它能增強產品而包含；而另一個供應商則可能省略相同項目。不包含特定選項的實作 MUST 準備好與包含該選項的另一實作進行互通，儘管功能可能會有所減少。同樣地，包含特定選項的實作 MUST 準備好與不包含該選項的另一實作進行互通（當然，除了該選項所提供的功能之外）。
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