MAY or the adjective "OPTIONAL", mean that an item is truly optional. RFC 2119

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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