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3 changes: 3 additions & 0 deletions aip/general/0203.md
Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,9 @@ A field **may** be described as optional if it is a field on a request message
(a message that is an argument to an RPC, usually ending in `Request`), or a
field on a submessage.

**Note:** The field presence label `optional` and the field behavior
`OPTIONAL` are not mutually exclusive. See AIP-149 for more details.

### Output only

The use of `OUTPUT_ONLY` indicates that the field is provided in responses, but
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