The version number in which this entity was deprecated (but is still available).
The version number in which this entity was introduced.
An optional message to provide to a user of this API, e.g., to suggest replacement APIs.
The version number in which this entity was obsoleted, and therefore is no longer available.
A string that describes the platform for which this structure provides availability information.
Whether the entity is unconditionally unavailable on this platform.
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Describes the availability of a given entity on a particular platform, e.g., a particular class might only be available on Mac OS 10.7 or newer.