import "google/protobuf/descriptor.proto"; extend .google.protobuf.FieldOptions { optional string description = 50000; } extend .google.protobuf.ServiceOptions { optional string service_description = 50000; } extend .google.protobuf.MethodOptions { optional string method_description = 50000; } extend .google.protobuf.EnumOptions { optional string enum_description = 50000; } extend .google.protobuf.EnumValueOptions { optional string enum_value_description = 50000; } message NoResponse { } message NotImplemented { }