pub const IDENTIFIER: FieldBehavior;Expand description
Denotes that the field in a resource (a message annotated with
google.api.resource) is used in the resource name to uniquely identify the
resource. For AIP-compliant APIs, this should only be applied to the
name field on the resource.
This behavior should not be applied to references to other resources within the message.
The identifier field of resources often have different field behavior
depending on the request it is embedded in (e.g. for Create methods name
is optional and unused, while for Update methods it is required). Instead
of method-specific annotations, only IDENTIFIER is required.