Conventional default for enums.

Denotes a field as immutable.

Denotes a field as input only.

Specifically denotes a field as optional.

Denotes a field as output only.

Denotes a field as required.

The resource has one pattern, but the API owner expects to add more later.

The "unset" value.

The resource originally had one pattern and launched as such, and additional patterns were added later.

A custom pattern is used for defining custom HTTP verb.

Defines the HTTP configuration for an API service.

# gRPC Transcoding gRPC Transcoding is a feature for mapping between a gRPC method and one or more HTTP REST endpoints.

A simple descriptor of a resource type.

Defines a proto annotation that describes a string field that refers to an API resource.

An indicator of the behavior of a given field (for example, that a field is required in requests, or given as output but ignored as input).

A description of the historical or future-looking state of the resource pattern.