Presence of a type at a version, distinguishing change boundaries from continuing states.
| Enumeration Member | Value | Description |
|---|
Added | "Added" | Becomes available at this version, including a re-addition after removal. |
Available | "Available" | Remains available after an earlier addition. |
Removed | "Removed" | Becomes unavailable at this version; removal takes effect immediately. |
Unavailable | "Unavailable" | Absent at this version, without a removal occurring at this version. |