MAY or the adjective "OPTIONAL" (RFC 2119), which are Case-sensitive (RFC 8174) mean that an item is truly optional.

One vendor may choose to include the item because a particular marketplace requires it or because the vendor feels that it enhances the product while another vendor may omit the same item.

We may use MAY in other contexts but we are implying the same interpretation as a Best Current Practice


MAY (also seen as OPTIONAL) indicates the Attributes that MAY contain values on an ObjectClass.

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