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TermMeaningComment
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MandatoryISA Extension is required for Profile compliance
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OptionalLocalized, Development, Expansion and Transitory are all sub-categories of Optional.
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LocalizedAn ISA Extension that is only relevant to a specific market, region, or domain.Some industries (e.g., automotive, aerospace, IoT, AI accelerators) may need localised extensions.
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DevelopmentAn experimental or provisional ISA Extension that is not yet ratified.Included in the profile definition, but only for early adopters who want to test and provide feedback.
Optional and does not affect profile compliance.
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ExpansionOptional standard extension that is not required for profile compliance
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TransitoryExpected to be phased out or replaced by a different, more stable feature in a future version of the profile.
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