This definition doesn’t work, since the Standard, in defining compliance in Section 2, says that "compliance is purely syntactic". So no behaviors are required. Therefore, by this definition, all behaviors are unspecified Surely this is not what is meant.

Clarify this definition. Perhaps it is meant to say, "Behavior for which this Standard does not make a recommendation"

behavior, unspecified Part 1, Section 4 "Definitions"

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Proposed Disposition of DIS 29500 Comment FR-0006 (Modified: 2008-01-04) Agreed; we will update Part 1 Definitions as follows: behavior, unspecified –Behavior where this Standard imposes no requirements makes no recommendations . [Note: To add an extension, an implementer must use the extensibility mechanisms described by this Standard rather than trying to do so by giving meaning to otherwise unspecified behavior. end note] Similar Comments: DK-0069 , GB-0031 , JP-0025 , KE-0076 , PT-0024 , US-0259