type property

The resource type that the annotated field references.

Example:

message Subscription {
  string topic = 2 [(google.api.resource_reference) = {
    type: "pubsub.googleapis.com/Topic"
  }];
}

Occasionally, a field may reference an arbitrary resource. In this case, APIs use the special value * in their resource reference.

Example:

message GetIamPolicyRequest {
  string resource = 2 [(google.api.resource_reference) = {
    type: "*"
  }];
}