diff --git a/google/api/resource.proto b/google/api/resource.proto
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+// Copyright 2019 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+syntax = "proto3";
+
+package google.api;
+
+import "google/protobuf/descriptor.proto";
+
+option cc_enable_arenas = true;
+option go_package = "google.golang.org/genproto/googleapis/api/annotations;annotations";
+option java_multiple_files = true;
+option java_outer_classname = "ResourceProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+extend google.protobuf.FieldOptions {
+  // An annotation that describes a resource reference, see
+  // [ResourceReference][].
+  google.api.ResourceReference resource_reference = 1055;
+}
+
+extend google.protobuf.FileOptions {
+  // An annotation that describes a resource definition without a corresponding
+  // message; see [ResourceDescriptor][].
+  repeated google.api.ResourceDescriptor resource_definition = 1053;
+}
+
+extend google.protobuf.MessageOptions {
+  // An annotation that describes a resource definition, see
+  // [ResourceDescriptor][].
+  google.api.ResourceDescriptor resource = 1053;
+}
+
+// A simple descriptor of a resource type.
+//
+// ResourceDescriptor annotates a resource message (either by means of a
+// protobuf annotation or use in the service config), and associates the
+// resource's schema, the resource type, and the pattern of the resource name.
+//
+// Example:
+//
+//     message Topic {
+//       // Indicates this message defines a resource schema.
+//       // Declares the resource type in the format of {service}/{kind}.
+//       // For Kubernetes resources, the format is {api group}/{kind}.
+//       option (google.api.resource) = {
+//         type: "pubsub.googleapis.com/Topic"
+//         name_descriptor: {
+//           pattern: "projects/{project}/topics/{topic}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Project"
+//           parent_name_extractor: "projects/{project}"
+//         }
+//       };
+//     }
+//
+// The ResourceDescriptor Yaml config will look like:
+//
+//    resources:
+//    - type: "pubsub.googleapis.com/Topic"
+//      name_descriptor:
+//        - pattern: "projects/{project}/topics/{topic}"
+//          parent_type: "cloudresourcemanager.googleapis.com/Project"
+//          parent_name_extractor: "projects/{project}"
+//
+// Sometimes, resources have multiple patterns, typically because they can
+// live under multiple parents.
+//
+// Example:
+//
+//     message LogEntry {
+//       option (google.api.resource) = {
+//         type: "logging.googleapis.com/LogEntry"
+//         name_descriptor: {
+//           pattern: "projects/{project}/logs/{log}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Project"
+//           parent_name_extractor: "projects/{project}"
+//         }
+//         name_descriptor: {
+//           pattern: "folders/{folder}/logs/{log}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Folder"
+//           parent_name_extractor: "folders/{folder}"
+//         }
+//         name_descriptor: {
+//           pattern: "organizations/{organization}/logs/{log}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Organization"
+//           parent_name_extractor: "organizations/{organization}"
+//         }
+//         name_descriptor: {
+//           pattern: "billingAccounts/{billing_account}/logs/{log}"
+//           parent_type: "billing.googleapis.com/BillingAccount"
+//           parent_name_extractor: "billingAccounts/{billing_account}"
+//         }
+//       };
+//     }
+//
+// The ResourceDescriptor Yaml config will look like:
+//
+//     resources:
+//     - type: 'logging.googleapis.com/LogEntry'
+//       name_descriptor:
+//         - pattern: "projects/{project}/logs/{log}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Project"
+//           parent_name_extractor: "projects/{project}"
+//         - pattern: "folders/{folder}/logs/{log}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Folder"
+//           parent_name_extractor: "folders/{folder}"
+//         - pattern: "organizations/{organization}/logs/{log}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Organization"
+//           parent_name_extractor: "organizations/{organization}"
+//         - pattern: "billingAccounts/{billing_account}/logs/{log}"
+//           parent_type: "billing.googleapis.com/BillingAccount"
+//           parent_name_extractor: "billingAccounts/{billing_account}"
+//
+// For flexible resources, the resource name doesn't contain parent names, but
+// the resource itself has parents for policy evaluation.
+//
+// Example:
+//
+//     message Shelf {
+//       option (google.api.resource) = {
+//         type: "library.googleapis.com/Shelf"
+//         name_descriptor: {
+//           pattern: "shelves/{shelf}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Project"
+//         }
+//         name_descriptor: {
+//           pattern: "shelves/{shelf}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Folder"
+//         }
+//       };
+//     }
+//
+// The ResourceDescriptor Yaml config will look like:
+//
+//     resources:
+//     - type: 'library.googleapis.com/Shelf'
+//       name_descriptor:
+//         - pattern: "shelves/{shelf}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Project"
+//         - pattern: "shelves/{shelf}"
+//           parent_type: "cloudresourcemanager.googleapis.com/Folder"
+message ResourceDescriptor {
+  // A description of the historical or future-looking state of the
+  // resource pattern.
+  enum History {
+    // The "unset" value.
+    HISTORY_UNSPECIFIED = 0;
+
+    // The resource originally had one pattern and launched as such, and
+    // additional patterns were added later.
+    ORIGINALLY_SINGLE_PATTERN = 1;
+
+    // The resource has one pattern, but the API owner expects to add more
+    // later. (This is the inverse of ORIGINALLY_SINGLE_PATTERN, and prevents
+    // that from being necessary once there are multiple patterns.)
+    FUTURE_MULTI_PATTERN = 2;
+  }
+
+  // The resource type. It must be in the format of
+  // {service_name}/{resource_type_kind}. The `resource_type_kind` must be
+  // singular and must not include version numbers.
+  //
+  // Example: `storage.googleapis.com/Bucket`
+  //
+  // The value of the resource_type_kind must follow the regular expression
+  // /[A-Za-z][a-zA-Z0-9]+/. It should start with an upper case character and
+  // should use PascalCase (UpperCamelCase). The maximum number of
+  // characters allowed for the `resource_type_kind` is 100.
+  string type = 1;
+
+  // Optional. The relative resource name pattern associated with this resource
+  // type. The DNS prefix of the full resource name shouldn't be specified here.
+  //
+  // The path pattern must follow the syntax, which aligns with HTTP binding
+  // syntax:
+  //
+  //     Template = Segment { "/" Segment } ;
+  //     Segment = LITERAL | Variable ;
+  //     Variable = "{" LITERAL "}" ;
+  //
+  // Examples:
+  //
+  //     - "projects/{project}/topics/{topic}"
+  //     - "projects/{project}/knowledgeBases/{knowledge_base}"
+  //
+  // The components in braces correspond to the IDs for each resource in the
+  // hierarchy. It is expected that, if multiple patterns are provided,
+  // the same component name (e.g. "project") refers to IDs of the same
+  // type of resource.
+  repeated string pattern = 2;
+
+  // Optional. The field on the resource that designates the resource name
+  // field. If omitted, this is assumed to be "name".
+  string name_field = 3;
+
+  // Optional. The historical or future-looking state of the resource pattern.
+  //
+  // Example:
+  //
+  //     // The InspectTemplate message originally only supported resource
+  //     // names with organization, and project was added later.
+  //     message InspectTemplate {
+  //       option (google.api.resource) = {
+  //         type: "dlp.googleapis.com/InspectTemplate"
+  //         pattern:
+  //         "organizations/{organization}/inspectTemplates/{inspect_template}"
+  //         pattern: "projects/{project}/inspectTemplates/{inspect_template}"
+  //         history: ORIGINALLY_SINGLE_PATTERN
+  //       };
+  //     }
+  History history = 4;
+
+  // The plural name used in the resource name, such as 'projects' for
+  // the name of 'projects/{project}'. It is the same concept of the `plural`
+  // field in k8s CRD spec
+  // https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/
+  string plural = 5;
+
+  // The same concept of the `singular` field in k8s CRD spec
+  // https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/
+  // Such as "project" for the `resourcemanager.googleapis.com/Project` type.
+  string singular = 6;
+}
+
+// Defines a proto annotation that describes a string field that refers to
+// an API resource.
+message ResourceReference {
+  // The resource type that the annotated field references.
+  //
+  // Example:
+  //
+  //     message Subscription {
+  //       string topic = 2 [(google.api.resource_reference) = {
+  //         type: "pubsub.googleapis.com/Topic"
+  //       }];
+  //     }
+  string type = 1;
+
+  // The resource type of a child collection that the annotated field
+  // references. This is useful for annotating the `parent` field that
+  // doesn't have a fixed resource type.
+  //
+  // Example:
+  //
+  //   message ListLogEntriesRequest {
+  //     string parent = 1 [(google.api.resource_reference) = {
+  //       child_type: "logging.googleapis.com/LogEntry"
+  //     };
+  //   }
+  string child_type = 2;
+}
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