diff --git a/google/cloud/documentai/v1beta3/BUILD.bazel b/google/cloud/documentai/v1beta3/BUILD.bazel
index 3c3962541..491e43de2 100644
--- a/google/cloud/documentai/v1beta3/BUILD.bazel
+++ b/google/cloud/documentai/v1beta3/BUILD.bazel
@@ -22,10 +22,12 @@ proto_library(
     name = "documentai_proto",
     srcs = [
         "barcode.proto",
+        "dataset.proto",
         "document.proto",
         "document_io.proto",
         "document_processor_service.proto",
         "document_schema.proto",
+        "document_service.proto",
         "evaluation.proto",
         "geometry.proto",
         "operation_metadata.proto",
@@ -91,8 +93,8 @@ java_gapic_library(
     rest_numeric_enums = True,
     service_yaml = "documentai_v1beta3.yaml",
     test_deps = [
-        ":documentai_java_grpc",
         "//google/cloud/location:location_java_grpc",
+        ":documentai_java_grpc",
     ],
     transport = "grpc+rest",
     deps = [
@@ -107,6 +109,8 @@ java_gapic_test(
     test_classes = [
         "com.google.cloud.documentai.v1beta3.DocumentProcessorServiceClientHttpJsonTest",
         "com.google.cloud.documentai.v1beta3.DocumentProcessorServiceClientTest",
+        "com.google.cloud.documentai.v1beta3.DocumentServiceClientHttpJsonTest",
+        "com.google.cloud.documentai.v1beta3.DocumentServiceClientTest",
     ],
     runtime_deps = [":documentai_java_gapic_test"],
 )
@@ -242,10 +246,13 @@ php_gapic_library(
     name = "documentai_php_gapic",
     srcs = [":documentai_proto_with_info"],
     grpc_service_config = "documentai_v1beta3_grpc_service_config.json",
+    migration_mode = "PRE_MIGRATION_SURFACE_ONLY",
     rest_numeric_enums = True,
     service_yaml = "documentai_v1beta3.yaml",
     transport = "grpc+rest",
-    deps = [":documentai_php_proto"],
+    deps = [
+        ":documentai_php_proto",
+    ],
 )
 
 # Open Source Packages
@@ -355,6 +362,7 @@ load(
 
 csharp_proto_library(
     name = "documentai_csharp_proto",
+    extra_opts = [""],
     deps = [":documentai_proto"],
 )
 
diff --git a/google/cloud/documentai/v1beta3/barcode.proto b/google/cloud/documentai/v1beta3/barcode.proto
index a5148172b..f0580e69a 100644
--- a/google/cloud/documentai/v1beta3/barcode.proto
+++ b/google/cloud/documentai/v1beta3/barcode.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/google/cloud/documentai/v1beta3/dataset.proto b/google/cloud/documentai/v1beta3/dataset.proto
new file mode 100644
index 000000000..fa50183bb
--- /dev/null
+++ b/google/cloud/documentai/v1beta3/dataset.proto
@@ -0,0 +1,138 @@
+// Copyright 2023 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.cloud.documentai.v1beta3;
+
+import "google/api/field_behavior.proto";
+import "google/api/resource.proto";
+import "google/cloud/documentai/v1beta3/document_io.proto";
+import "google/cloud/documentai/v1beta3/document_schema.proto";
+
+option csharp_namespace = "Google.Cloud.DocumentAI.V1Beta3";
+option go_package = "cloud.google.com/go/documentai/apiv1beta3/documentaipb;documentaipb";
+option java_multiple_files = true;
+option java_outer_classname = "DatasetProto";
+option java_package = "com.google.cloud.documentai.v1beta3";
+option php_namespace = "Google\\Cloud\\DocumentAI\\V1beta3";
+option ruby_package = "Google::Cloud::DocumentAI::V1beta3";
+option (google.api.resource_definition) = {
+  type: "contentwarehouse.googleapis.com/Schema"
+  pattern: "projects/{project}/locations/{location}/schemas/{schema}"
+};
+
+// A singleton resource under a
+// [Processor][google.cloud.documentai.v1beta3.Processor] which configures a
+// collection of documents.
+message Dataset {
+  option (google.api.resource) = {
+    type: "documentai.googleapis.com/Dataset"
+    pattern: "projects/{project}/locations/{location}/processors/{processor}/dataset"
+  };
+
+  // Configuration specific to the Cloud Storage-based implementation.
+  message GCSManagedConfig {
+    // Required. The Cloud Storage URI (a directory) where the documents
+    // belonging to the dataset must be stored.
+    GcsPrefix gcs_prefix = 1 [(google.api.field_behavior) = REQUIRED];
+  }
+
+  // Configuration specific to the Document AI Warehouse-based implementation.
+  message DocumentWarehouseConfig {
+    // Output only. The collection in Document AI Warehouse associated with the
+    // dataset.
+    string collection = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+    // Output only. The schema in Document AI Warehouse associated with the
+    // dataset.
+    string schema = 2 [
+      (google.api.field_behavior) = OUTPUT_ONLY,
+      (google.api.resource_reference) = {
+        type: "contentwarehouse.googleapis.com/Schema"
+      }
+    ];
+  }
+
+  // Configuration specific to an unmanaged dataset.
+  message UnmanagedDatasetConfig {}
+
+  // Configuration specific to spanner-based indexing.
+  message SpannerIndexingConfig {}
+
+  // Different states of a dataset.
+  enum State {
+    // Default unspecified enum, should not be used.
+    STATE_UNSPECIFIED = 0;
+
+    // Dataset has not been initialized.
+    UNINITIALIZED = 1;
+
+    // Dataset is being initialized.
+    INITIALIZING = 2;
+
+    // Dataset has been initialized.
+    INITIALIZED = 3;
+  }
+
+  oneof storage_source {
+    // Optional. User-managed Cloud Storage dataset configuration. Use this
+    // configuration if the dataset documents are stored under a user-managed
+    // Cloud Storage location.
+    GCSManagedConfig gcs_managed_config = 3
+        [(google.api.field_behavior) = OPTIONAL];
+
+    // Optional. Document AI Warehouse-based dataset configuration.
+    DocumentWarehouseConfig document_warehouse_config = 5
+        [(google.api.field_behavior) = OPTIONAL];
+
+    // Optional. Unmanaged dataset configuration. Use this configuration if the
+    // dataset documents are managed by the document service internally (not
+    // user-managed).
+    UnmanagedDatasetConfig unmanaged_dataset_config = 6
+        [(google.api.field_behavior) = OPTIONAL];
+  }
+
+  oneof indexing_source {
+    // Optional. A lightweight indexing source with low latency and high
+    // reliability, but lacking advanced features like CMEK and content-based
+    // search.
+    SpannerIndexingConfig spanner_indexing_config = 4
+        [(google.api.field_behavior) = OPTIONAL];
+  }
+
+  // Dataset resource name.
+  // Format:
+  // `projects/{project}/locations/{location}/processors/{processor}/dataset`
+  string name = 1;
+
+  // Required. State of the dataset. Ignored when updating dataset.
+  State state = 2 [(google.api.field_behavior) = REQUIRED];
+}
+
+// Dataset Schema.
+message DatasetSchema {
+  option (google.api.resource) = {
+    type: "documentai.googleapis.com/DatasetSchema"
+    pattern: "projects/{project}/locations/{location}/processors/{processor}/dataset/datasetSchema"
+  };
+
+  // Dataset schema resource name.
+  // Format:
+  // `projects/{project}/locations/{location}/processors/{processor}/dataset/datasetSchema`
+  string name = 1;
+
+  // Optional. Schema of the dataset.
+  DocumentSchema document_schema = 3 [(google.api.field_behavior) = OPTIONAL];
+}
diff --git a/google/cloud/documentai/v1beta3/document.proto b/google/cloud/documentai/v1beta3/document.proto
index 193f7700d..8250d4d66 100644
--- a/google/cloud/documentai/v1beta3/document.proto
+++ b/google/cloud/documentai/v1beta3/document.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -64,7 +64,8 @@ message Document {
       // Font size for the text.
       float size = 1;
 
-      // Unit for the font size. Follows CSS naming (in, px, pt, etc.).
+      // Unit for the font size. Follows CSS naming (such as `in`, `px`, and
+      // `pt`).
       string unit = 2;
     }
 
@@ -78,17 +79,18 @@ message Document {
     // Text background color.
     google.type.Color background_color = 3;
 
-    // Font weight. Possible values are normal, bold, bolder, and lighter.
-    // https://www.w3schools.com/cssref/pr_font_weight.asp
+    // [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
+    // Possible values are `normal`, `bold`, `bolder`, and `lighter`.
     string font_weight = 4;
 
-    // Text style. Possible values are normal, italic, and oblique.
-    // https://www.w3schools.com/cssref/pr_font_font-style.asp
+    // [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
+    // Possible values are `normal`, `italic`, and `oblique`.
     string text_style = 5;
 
-    // Text decoration. Follows CSS standard.
-    // <text-decoration-line> <text-decoration-color> <text-decoration-style>
-    // https://www.w3schools.com/cssref/pr_text_text-decoration.asp
+    // [Text
+    // decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
+    // Follows CSS standard. <text-decoration-line> <text-decoration-color>
+    // <text-decoration-style>
     string text_decoration = 6;
 
     // Font size.
@@ -118,7 +120,9 @@ message Document {
       // Raw byte content of the image.
       bytes content = 1;
 
-      // Encoding mime type for the image.
+      // Encoding [media type (MIME
+      // type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
+      // for the image.
       string mime_type = 2;
 
       // Width of the image in pixels.
@@ -255,6 +259,59 @@ message Document {
         Type type = 1;
       }
 
+      // Font and other text style attributes.
+      message StyleInfo {
+        // Font size in points (`1` point is `¹⁄₇₂` inches).
+        int32 font_size = 1;
+
+        // Font size in pixels, equal to _unrounded
+        // [font_size][google.cloud.documentai.v1beta3.Document.Page.Token.StyleInfo.font_size]_
+        // * _resolution_ ÷ `72.0`.
+        double pixel_font_size = 2;
+
+        // Letter spacing in points.
+        double letter_spacing = 3;
+
+        // Name or style of the font.
+        string font_type = 4;
+
+        // Whether the text is bold (equivalent to
+        // [font_weight][google.cloud.documentai.v1beta3.Document.Page.Token.StyleInfo.font_weight]
+        // is at least `700`).
+        bool bold = 5;
+
+        // Whether the text is italic.
+        bool italic = 6;
+
+        // Whether the text is underlined.
+        bool underlined = 7;
+
+        // Whether the text is strikethrough.
+        bool strikeout = 8;
+
+        // Whether the text is a subscript.
+        bool subscript = 9;
+
+        // Whether the text is a superscript.
+        bool superscript = 10;
+
+        // Whether the text is in small caps.
+        bool smallcaps = 11;
+
+        // TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
+        // Normal is `400`, bold is `700`.
+        int32 font_weight = 12;
+
+        // Whether the text is handwritten.
+        bool handwritten = 13;
+
+        // Color of the text.
+        google.type.Color text_color = 14;
+
+        // Color of the background.
+        google.type.Color background_color = 15;
+      }
+
       // [Layout][google.cloud.documentai.v1beta3.Document.Page.Layout] for
       // [Token][google.cloud.documentai.v1beta3.Document.Page.Token].
       Layout layout = 1;
@@ -268,6 +325,9 @@ message Document {
 
       // The history of this annotation.
       Provenance provenance = 4 [deprecated = true];
+
+      // Text style attributes.
+      StyleInfo style_info = 5;
     }
 
     // A detected symbol.
@@ -333,7 +393,7 @@ message Document {
       repeated DetectedLanguage detected_languages = 4;
 
       // The history of this table.
-      Provenance provenance = 5;
+      Provenance provenance = 5 [deprecated = true];
     }
 
     // A form field detected on the page.
@@ -389,16 +449,16 @@ message Document {
 
     // Detected language for a structural component.
     message DetectedLanguage {
-      // The BCP-47 language code, such as `en-US` or `sr-Latn`. For more
-      // information, see
-      // https://www.unicode.org/reports/tr35/#Unicode_locale_identifier.
+      // The [BCP-47 language
+      // code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
+      // such as `en-US` or `sr-Latn`.
       string language_code = 1;
 
       // Confidence of detected language. Range `[0, 1]`.
       float confidence = 2;
     }
 
-    // Image Quality Scores for the page image
+    // Image quality scores for the page image.
     message ImageQualityScores {
       // Image Quality Defects
       message DetectedDefect {
@@ -414,12 +474,12 @@ message Document {
         // - `quality/defect_glare`
         string type = 1;
 
-        // Confidence of detected defect. Range `[0, 1]` where 1 indicates
-        // strong confidence of that the defect exists.
+        // Confidence of detected defect. Range `[0, 1]` where `1` indicates
+        // strong confidence that the defect exists.
         float confidence = 2;
       }
 
-      // The overall quality score. Range `[0, 1]` where 1 is perfect quality.
+      // The overall quality score. Range `[0, 1]` where `1` is perfect quality.
       float quality_score = 1;
 
       // A list of detected defects.
@@ -485,7 +545,7 @@ message Document {
     // A list of detected barcodes.
     repeated DetectedBarcode detected_barcodes = 15;
 
-    // Image Quality Scores.
+    // Image quality scores.
     ImageQualityScores image_quality_scores = 17;
 
     // The history of this page.
@@ -740,13 +800,13 @@ message Document {
       REMOVE = 2;
 
       // Updates any fields within the given provenance scope of the message. It
-      // 'overwrites'  the fields rather than replacing them.  This is
-      // especially relevant when we just want to update a field value of an
-      // entity without also affecting all the child properties.
+      // overwrites the fields rather than replacing them.  Use this when you
+      // want to update a field value of an entity without also updating all the
+      // child properties.
       UPDATE = 7;
 
       // Currently unused. Replace an element identified by `parent`.
-      REPLACE = 3 [deprecated = true];
+      REPLACE = 3;
 
       // Deprecated. Request human review for the element identified by
       // `parent`.
@@ -839,10 +899,9 @@ message Document {
   // Original source document from the user.
   oneof source {
     // Optional. Currently supports Google Cloud Storage URI of the form
-    //    `gs://bucket_name/object_name`. Object versioning is not supported.
-    //    See [Google Cloud Storage Request
-    //    URIs](https://cloud.google.com/storage/docs/reference-uris) for more
-    //    info.
+    // `gs://bucket_name/object_name`. Object versioning is not supported.
+    // For more information, refer to [Google Cloud Storage Request
+    // URIs](https://cloud.google.com/storage/docs/reference-uris).
     string uri = 1 [(google.api.field_behavior) = OPTIONAL];
 
     // Optional. Inline document content, represented as a stream of bytes.
@@ -851,9 +910,8 @@ message Document {
     bytes content = 2 [(google.api.field_behavior) = OPTIONAL];
   }
 
-  // An IANA published MIME type (also referred to as media type). For more
-  // information, see
-  // https://www.iana.org/assignments/media-types/media-types.xhtml.
+  // An IANA published [media type (MIME
+  // type)](https://www.iana.org/assignments/media-types/media-types.xhtml).
   string mime_type = 3;
 
   // Optional. UTF-8 encoded text in reading order from the document.
diff --git a/google/cloud/documentai/v1beta3/document_io.proto b/google/cloud/documentai/v1beta3/document_io.proto
index 9de0733f4..1b7e7ce2f 100644
--- a/google/cloud/documentai/v1beta3/document_io.proto
+++ b/google/cloud/documentai/v1beta3/document_io.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -127,9 +127,18 @@ message OcrConfig {
   // Adds additional latency comparable to regular OCR to the process call.
   bool enable_image_quality_scores = 4;
 
-  // A list of advanced OCR options to further fine-tune OCR behavior.
+  // A list of advanced OCR options to further fine-tune OCR behavior. Current
+  // valid values are:
+  //
+  // - `legacy_layout`: a heuristics layout detection algorithm, which serves as
+  // an alternative to the current ML-based layout detection algorithm.
+  // Customers can choose the best suitable layout algorithm based on their
+  // situation.
   repeated string advanced_ocr_options = 5;
 
   // Includes symbol level OCR information if set to true.
   bool enable_symbol = 6;
+
+  // Turn on font id model and returns font style information.
+  bool compute_style_info = 8;
 }
diff --git a/google/cloud/documentai/v1beta3/document_processor_service.proto b/google/cloud/documentai/v1beta3/document_processor_service.proto
index 885bdffd8..b2a873625 100644
--- a/google/cloud/documentai/v1beta3/document_processor_service.proto
+++ b/google/cloud/documentai/v1beta3/document_processor_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@ import "google/cloud/documentai/v1beta3/operation_metadata.proto";
 import "google/cloud/documentai/v1beta3/processor.proto";
 import "google/cloud/documentai/v1beta3/processor_type.proto";
 import "google/longrunning/operations.proto";
+import "google/protobuf/empty.proto";
 import "google/protobuf/field_mask.proto";
 import "google/protobuf/timestamp.proto";
 import "google/rpc/status.proto";
@@ -48,7 +49,7 @@ option (google.api.resource_definition) = {
   pattern: "projects/{project}/locations/{location}"
 };
 
-// Service to call Cloud DocumentAI to process documents according to the
+// Service to call Document AI to process documents according to the
 // processor's definition. Processors are built using state-of-the-art Google
 // AI such as natural language, computer vision, and translation to extract
 // structured information from unstructured or semi-structured documents.
@@ -89,8 +90,9 @@ service DocumentProcessorService {
     };
   }
 
-  // Fetches processor types. Note that we do not use ListProcessorTypes here
-  // because it is not paginated.
+  // Fetches processor types. Note that we don't use
+  // [ListProcessorTypes][google.cloud.documentai.v1beta3.DocumentProcessorService.ListProcessorTypes]
+  // here, because it isn't paginated.
   rpc FetchProcessorTypes(FetchProcessorTypesRequest)
       returns (FetchProcessorTypesResponse) {
     option (google.api.http) = {
@@ -134,7 +136,7 @@ service DocumentProcessorService {
 
   // Trains a new processor version.
   // Operation metadata is returned as
-  // cloud_documentai_core.TrainProcessorVersionMetadata.
+  // [TrainProcessorVersionMetadata][google.cloud.documentai.v1beta3.TrainProcessorVersionMetadata].
   rpc TrainProcessorVersion(TrainProcessorVersionRequest)
       returns (google.longrunning.Operation) {
     option (google.api.http) = {
@@ -208,8 +210,9 @@ service DocumentProcessorService {
     };
   }
 
-  // Creates a processor from the type processor that the user chose.
-  // The processor will be at "ENABLED" state by default after its creation.
+  // Creates a processor from the
+  // [ProcessorType][google.cloud.documentai.v1beta3.ProcessorType] provided.
+  // The processor will be at `ENABLED` state by default after its creation.
   rpc CreateProcessor(CreateProcessorRequest) returns (Processor) {
     option (google.api.http) = {
       post: "/v1beta3/{parent=projects/*/locations/*}/processors"
@@ -339,12 +342,14 @@ service DocumentProcessorService {
 
 // Options for Process API
 message ProcessOptions {
-  // Only applicable to "Document OCR Processor". Returns error if set on other
+  // Only applicable to `OCR_PROCESSOR`. Returns error if set on other
   // processor types.
   OcrConfig ocr_config = 1;
 }
 
-// Request message for the process document method.
+// Request message for the
+// [ProcessDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ProcessDocument]
+// method.
 message ProcessRequest {
   // The document payload.
   oneof source {
@@ -370,16 +375,20 @@ message ProcessRequest {
     (google.api.resource_reference) = { type: "*" }
   ];
 
-  // The document payload, the [content] and [mime_type] fields must be set.
+  // The document payload, the
+  // [content][google.cloud.documentai.v1beta3.Document.content] and
+  // [mime_type][google.cloud.documentai.v1beta3.Document.mime_type] fields must
+  // be set.
   Document document = 2 [deprecated = true];
 
-  // Whether Human Review feature should be skipped for this request. Default to
-  // false.
+  // Whether human review should be skipped for this request. Default to
+  // `false`.
   bool skip_human_review = 3;
 
-  // Specifies which fields to include in ProcessResponse's document.
-  // Only supports top level document and pages field so it must be in the form
-  // of `{document_field_name}` or `pages.{page_field_name}`.
+  // Specifies which fields to include in the
+  // [ProcessResponse.document][google.cloud.documentai.v1beta3.ProcessResponse.document]
+  // output. Only supports top-level document and pages field, so it must be in
+  // the form of `{document_field_name}` or `pages.{page_field_name}`.
   google.protobuf.FieldMask field_mask = 6;
 
   // Inference-time options for the process API
@@ -394,7 +403,7 @@ message HumanReviewStatus {
     STATE_UNSPECIFIED = 0;
 
     // Human review is skipped for the document. This can happen because human
-    // review is not enabled on the processor or the processing request has
+    // review isn't enabled on the processor or the processing request has
     // been set to skip this document.
     SKIPPED = 1;
 
@@ -405,7 +414,8 @@ message HumanReviewStatus {
     IN_PROGRESS = 3;
 
     // Some error happened during triggering human review, see the
-    // [state_message] for details.
+    // [state_message][google.cloud.documentai.v1beta3.HumanReviewStatus.state_message]
+    // for details.
     ERROR = 4;
   }
 
@@ -416,29 +426,34 @@ message HumanReviewStatus {
   string state_message = 2;
 
   // The name of the operation triggered by the processed document. This field
-  // is populated only when the [state] is [HUMAN_REVIEW_IN_PROGRESS]. It has
-  // the same response type and metadata as the long running operation returned
-  // by [ReviewDocument] method.
+  // is populated only when the
+  // [state][google.cloud.documentai.v1beta3.HumanReviewStatus.state] is
+  // `HUMAN_REVIEW_IN_PROGRESS`. It has the same response type and metadata as
+  // the long-running operation returned by
+  // [ReviewDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ReviewDocument].
   string human_review_operation = 3;
 }
 
-// Response message for the process document method.
+// Response message for the
+// [ProcessDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ProcessDocument]
+// method.
 message ProcessResponse {
   // The document payload, will populate fields based on the processor's
   // behavior.
   Document document = 1;
 
   // The name of the operation triggered by the processed document. If the human
-  // review process is not triggered, this field will be empty. It has the same
-  // response type and metadata as the long running operation returned by
-  // ReviewDocument method.
+  // review process isn't triggered, this field is empty. It has the same
+  // response type and metadata as the long-running operation returned by
+  // [ReviewDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ReviewDocument].
   string human_review_operation = 2 [deprecated = true];
 
   // The status of human review on the processed document.
   HumanReviewStatus human_review_status = 3;
 }
 
-// Request message for batch process document method.
+// Request message for
+// [BatchProcessDocuments][google.cloud.documentai.v1beta3.DocumentProcessorService.BatchProcessDocuments].
 message BatchProcessRequest {
   // The message for input config in batch process.
   message BatchInputConfig {
@@ -447,13 +462,19 @@ message BatchProcessRequest {
     // The Cloud Storage location as the source of the document.
     string gcs_source = 1;
 
-    // Mimetype of the input. If the input is a raw document, the supported
-    // mimetypes are application/pdf, image/tiff, and image/gif.
-    // If the input is a [Document] proto, the type should be application/json.
+    // An IANA published [media type (MIME
+    // type)](https://www.iana.org/assignments/media-types/media-types.xhtml) of
+    // the input. If the input is a raw document, refer to [supported file
+    // types](https://cloud.google.com/document-ai/docs/file-types) for the list
+    // of media types. If the input is a
+    // [Document][google.cloud.documentai.v1beta3.Document], the type should be
+    // `application/json`.
     string mime_type = 2;
   }
 
-  // The message for output config in batch process.
+  // The output configuration in the
+  // [BatchProcessDocuments][google.cloud.documentai.v1beta3.DocumentProcessorService.BatchProcessDocuments]
+  // method.
   message BatchOutputConfig {
     option deprecated = true;
 
@@ -478,44 +499,52 @@ message BatchProcessRequest {
   // The overall output config for batch process.
   BatchOutputConfig output_config = 3 [deprecated = true];
 
-  // The input documents for batch process.
+  // The input documents for the
+  // [BatchProcessDocuments][google.cloud.documentai.v1beta3.DocumentProcessorService.BatchProcessDocuments]
+  // method.
   BatchDocumentsInputConfig input_documents = 5;
 
-  // The overall output config for batch process.
+  // The output configuration for the
+  // [BatchProcessDocuments][google.cloud.documentai.v1beta3.DocumentProcessorService.BatchProcessDocuments]
+  // method.
   DocumentOutputConfig document_output_config = 6;
 
-  // Whether Human Review feature should be skipped for this request. Default to
-  // false.
+  // Whether human review should be skipped for this request. Default to
+  // `false`.
   bool skip_human_review = 4;
 
   // Inference-time options for the process API
   ProcessOptions process_options = 7;
 }
 
-// Response message for batch process document method.
+// Response message for
+// [BatchProcessDocuments][google.cloud.documentai.v1beta3.DocumentProcessorService.BatchProcessDocuments].
 message BatchProcessResponse {}
 
-// The long running operation metadata for batch process method.
+// The long-running operation metadata for
+// [BatchProcessDocuments][google.cloud.documentai.v1beta3.DocumentProcessorService.BatchProcessDocuments].
 message BatchProcessMetadata {
   // The status of a each individual document in the batch process.
   message IndividualProcessStatus {
-    // The source of the document, same as the [input_gcs_source] field in the
-    // request when the batch process started. The batch process is started by
-    // take snapshot of that document, since a user can move or change that
-    // document during the process.
+    // The source of the document, same as the
+    // [input_gcs_source][google.cloud.documentai.v1beta3.BatchProcessMetadata.IndividualProcessStatus.input_gcs_source]
+    // field in the request when the batch process started.
     string input_gcs_source = 1;
 
     // The status processing the document.
     google.rpc.Status status = 2;
 
-    // The output_gcs_destination (in the request as `output_gcs_destination`)
+    // The Cloud Storage output destination (in the request as
+    // [DocumentOutputConfig.GcsOutputConfig.gcs_uri][google.cloud.documentai.v1beta3.DocumentOutputConfig.GcsOutputConfig.gcs_uri])
     // of the processed document if it was successful, otherwise empty.
     string output_gcs_destination = 3;
 
     // The name of the operation triggered by the processed document. If the
-    // human review process is not triggered, this field will be empty. It has
-    // the same response type and metadata as the long running operation
-    // returned by ReviewDocument method.
+    // human review process isn't triggered, this field will be empty. It has
+    // the same response type and metadata as the long-running operation
+    // returned by the
+    // [ReviewDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ReviewDocument]
+    // method.
     string human_review_operation = 4 [deprecated = true];
 
     // The status of human review on the processed document.
@@ -563,11 +592,13 @@ message BatchProcessMetadata {
   repeated IndividualProcessStatus individual_process_statuses = 5;
 }
 
-// Request message for fetch processor types.
+// Request message for the
+// [FetchProcessorTypes][google.cloud.documentai.v1beta3.DocumentProcessorService.FetchProcessorTypes]
+// method. Some processor types may require the project be added to an
+// allowlist.
 message FetchProcessorTypesRequest {
-  // Required. The project of processor type to list.
-  // The available processor types may depend on the allow-listing on projects.
-  // Format: `projects/{project}/locations/{location}`
+  // Required. The location of processor types to list.
+  // Format: `projects/{project}/locations/{location}`.
   string parent = 1 [
     (google.api.field_behavior) = REQUIRED,
     (google.api.resource_reference) = {
@@ -576,17 +607,21 @@ message FetchProcessorTypesRequest {
   ];
 }
 
-// Response message for fetch processor types.
+// Response message for the
+// [FetchProcessorTypes][google.cloud.documentai.v1beta3.DocumentProcessorService.FetchProcessorTypes]
+// method.
 message FetchProcessorTypesResponse {
   // The list of processor types.
   repeated ProcessorType processor_types = 1;
 }
 
-// Request message for list processor types.
+// Request message for the
+// [ListProcessorTypes][google.cloud.documentai.v1beta3.DocumentProcessorService.ListProcessorTypes]
+// method. Some processor types may require the project be added to an
+// allowlist.
 message ListProcessorTypesRequest {
-  // Required. The location of processor type to list.
-  // The available processor types may depend on the allow-listing on projects.
-  // Format: `projects/{project}/locations/{location}`
+  // Required. The location of processor types to list.
+  // Format: `projects/{project}/locations/{location}`.
   string parent = 1 [
     (google.api.field_behavior) = REQUIRED,
     (google.api.resource_reference) = {
@@ -595,15 +630,17 @@ message ListProcessorTypesRequest {
   ];
 
   // The maximum number of processor types to return.
-  // If unspecified, at most 100 processor types will be returned.
-  // The maximum value is 500; values above 500 will be coerced to 500.
+  // If unspecified, at most `100` processor types will be returned.
+  // The maximum value is `500`. Values above `500` will be coerced to `500`.
   int32 page_size = 2;
 
   // Used to retrieve the next page of results, empty if at the end of the list.
   string page_token = 3;
 }
 
-// Response message for list processor types.
+// Response message for the
+// [ListProcessorTypes][google.cloud.documentai.v1beta3.DocumentProcessorService.ListProcessorTypes]
+// method.
 message ListProcessorTypesResponse {
   // The processor types.
   repeated ProcessorType processor_types = 1;
@@ -624,8 +661,8 @@ message ListProcessorsRequest {
   ];
 
   // The maximum number of processors to return.
-  // If unspecified, at most 50 processors will be returned.
-  // The maximum value is 100; values above 100 will be coerced to 100.
+  // If unspecified, at most `50` processors will be returned.
+  // The maximum value is `100`. Values above `100` will be coerced to `100`.
   int32 page_size = 2;
 
   // We will return the processors sorted by creation time. The page token
@@ -633,7 +670,9 @@ message ListProcessorsRequest {
   string page_token = 3;
 }
 
-// Response message for list processors.
+// Response message for the
+// [ListProcessors][google.cloud.documentai.v1beta3.DocumentProcessorService.ListProcessors]
+// method.
 message ListProcessorsResponse {
   // The list of processors.
   repeated Processor processors = 1;
@@ -642,7 +681,9 @@ message ListProcessorsResponse {
   string next_page_token = 2;
 }
 
-// Request message for get processor.
+// Request message for the
+// [GetProcessorType][google.cloud.documentai.v1beta3.DocumentProcessorService.GetProcessorType]
+// method.
 message GetProcessorTypeRequest {
   // Required. The processor type resource name.
   string name = 1 [
@@ -653,7 +694,9 @@ message GetProcessorTypeRequest {
   ];
 }
 
-// Request message for get processor.
+// Request message for the
+// [GetProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.GetProcessor]
+// method.
 message GetProcessorRequest {
   // Required. The processor resource name.
   string name = 1 [
@@ -664,7 +707,9 @@ message GetProcessorRequest {
   ];
 }
 
-// Request message for get processor version.
+// Request message for the
+// [GetProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.GetProcessorVersion]
+// method.
 message GetProcessorVersionRequest {
   // Required. The processor resource name.
   string name = 1 [
@@ -688,8 +733,8 @@ message ListProcessorVersionsRequest {
   ];
 
   // The maximum number of processor versions to return.
-  // If unspecified, at most 10 processor versions will be returned.
-  // The maximum value is 20; values above 20 will be coerced to 20.
+  // If unspecified, at most `10` processor versions will be returned.
+  // The maximum value is `20`. Values above `20` will be coerced to `20`.
   int32 page_size = 2;
 
   // We will return the processor versions sorted by creation time. The page
@@ -697,7 +742,9 @@ message ListProcessorVersionsRequest {
   string page_token = 3;
 }
 
-// Response message for list processors.
+// Response message for the
+// [ListProcessorVersions][google.cloud.documentai.v1beta3.DocumentProcessorService.ListProcessorVersions]
+// method.
 message ListProcessorVersionsResponse {
   // The list of processors.
   repeated ProcessorVersion processor_versions = 1;
@@ -706,7 +753,9 @@ message ListProcessorVersionsResponse {
   string next_page_token = 2;
 }
 
-// Request message for the delete processor version method.
+// Request message for the
+// [DeleteProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.DeleteProcessorVersion]
+// method.
 message DeleteProcessorVersionRequest {
   // Required. The processor version resource name to be deleted.
   string name = 1 [
@@ -717,13 +766,17 @@ message DeleteProcessorVersionRequest {
   ];
 }
 
-// The long running operation metadata for delete processor version method.
+// The long-running operation metadata for the
+// [DeleteProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.DeleteProcessorVersion]
+// method.
 message DeleteProcessorVersionMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 1;
 }
 
-// Request message for the deploy processor version method.
+// Request message for the
+// [DeployProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.DeployProcessorVersion]
+// method.
 message DeployProcessorVersionRequest {
   // Required. The processor version resource name to be deployed.
   string name = 1 [
@@ -734,16 +787,22 @@ message DeployProcessorVersionRequest {
   ];
 }
 
-// Response message for the deploy processor version method.
+// Response message for the
+// [DeployProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.DeployProcessorVersion]
+// method.
 message DeployProcessorVersionResponse {}
 
-// The long running operation metadata for deploy processor version method.
+// The long-running operation metadata for the
+// [DeployProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.DeployProcessorVersion]
+// method.
 message DeployProcessorVersionMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 1;
 }
 
-// Request message for the undeploy processor version method.
+// Request message for the
+// [UndeployProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.UndeployProcessorVersion]
+// method.
 message UndeployProcessorVersionRequest {
   // Required. The processor version resource name to be undeployed.
   string name = 1 [
@@ -754,19 +813,24 @@ message UndeployProcessorVersionRequest {
   ];
 }
 
-// Response message for the undeploy processor version method.
+// Response message for the
+// [UndeployProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.UndeployProcessorVersion]
+// method.
 message UndeployProcessorVersionResponse {}
 
-// The long running operation metadata for the undeploy processor version
+// The long-running operation metadata for the
+// [UndeployProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.UndeployProcessorVersion]
 // method.
 message UndeployProcessorVersionMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 1;
 }
 
-// Request message for create a processor. Notice this request is sent to
-// a regionalized backend service, and if the processor type is not available
-// on that region, the creation will fail.
+// Request message for the
+// [CreateProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.CreateProcessor]
+// method. Notice this request is sent to a regionalized backend service. If the
+// [ProcessorType][google.cloud.documentai.v1beta3.ProcessorType] isn't
+// available in that region, the creation fails.
 message CreateProcessorRequest {
   // Required. The parent (project and location) under which to create the
   // processor. Format: `projects/{project}/locations/{location}`
@@ -777,13 +841,17 @@ message CreateProcessorRequest {
     }
   ];
 
-  // Required. The processor to be created, requires [processor_type] and
-  // [display_name] to be set. Also, the processor is under CMEK if CMEK fields
-  // are set.
+  // Required. The processor to be created, requires
+  // [Processor.type][google.cloud.documentai.v1beta3.Processor.type] and
+  // [Processor.display_name]][] to be set. Also, the
+  // [Processor.kms_key_name][google.cloud.documentai.v1beta3.Processor.kms_key_name]
+  // field must be set if the processor is under CMEK.
   Processor processor = 2 [(google.api.field_behavior) = REQUIRED];
 }
 
-// Request message for the delete processor method.
+// Request message for the
+// [DeleteProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.DeleteProcessor]
+// method.
 message DeleteProcessorRequest {
   // Required. The processor resource name to be deleted.
   string name = 1 [
@@ -794,13 +862,17 @@ message DeleteProcessorRequest {
   ];
 }
 
-// The long running operation metadata for delete processor method.
+// The long-running operation metadata for the
+// [DeleteProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.DeleteProcessor]
+// method.
 message DeleteProcessorMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 5;
 }
 
-// Request message for the enable processor method.
+// Request message for the
+// [EnableProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.EnableProcessor]
+// method.
 message EnableProcessorRequest {
   // Required. The processor resource name to be enabled.
   string name = 1 [
@@ -811,17 +883,22 @@ message EnableProcessorRequest {
   ];
 }
 
-// Response message for the enable processor method.
-// Intentionally empty proto for adding fields in future.
+// Response message for the
+// [EnableProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.EnableProcessor]
+// method. Intentionally empty proto for adding fields in future.
 message EnableProcessorResponse {}
 
-// The long running operation metadata for enable processor method.
+// The long-running operation metadata for the
+// [EnableProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.EnableProcessor]
+// method.
 message EnableProcessorMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 5;
 }
 
-// Request message for the disable processor method.
+// Request message for the
+// [DisableProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.DisableProcessor]
+// method.
 message DisableProcessorRequest {
   // Required. The processor resource name to be disabled.
   string name = 1 [
@@ -832,17 +909,22 @@ message DisableProcessorRequest {
   ];
 }
 
-// Response message for the disable processor method.
-// Intentionally empty proto for adding fields in future.
+// Response message for the
+// [DisableProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.DisableProcessor]
+// method. Intentionally empty proto for adding fields in future.
 message DisableProcessorResponse {}
 
-// The long running operation metadata for disable processor method.
+// The long-running operation metadata for the
+// [DisableProcessor][google.cloud.documentai.v1beta3.DocumentProcessorService.DisableProcessor]
+// method.
 message DisableProcessorMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 5;
 }
 
-// Request message for the set default processor version method.
+// Request message for the
+// [SetDefaultProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.SetDefaultProcessorVersion]
+// method.
 message SetDefaultProcessorVersionRequest {
   // Required. The resource name of the
   // [Processor][google.cloud.documentai.v1beta3.Processor] to change default
@@ -866,19 +948,25 @@ message SetDefaultProcessorVersionRequest {
   ];
 }
 
-// Response message for set default processor version method.
+// Response message for the
+// [SetDefaultProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.SetDefaultProcessorVersion]
+// method.
 message SetDefaultProcessorVersionResponse {}
 
-// The long running operation metadata for set default processor version
+// The long-running operation metadata for the
+// [SetDefaultProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.SetDefaultProcessorVersion]
 // method.
 message SetDefaultProcessorVersionMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 1;
 }
 
-// Request message for the create processor version method.
+// Request message for the
+// [TrainProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.TrainProcessorVersion]
+// method.
 message TrainProcessorVersionRequest {
-  // The input data used to train a new `ProcessorVersion`.
+  // The input data used to train a new
+  // [ProcessorVersion][google.cloud.documentai.v1beta3.ProcessorVersion].
   message InputData {
     // The documents used for training the new version.
     BatchDocumentsInputConfig training_documents = 3;
@@ -887,6 +975,28 @@ message TrainProcessorVersionRequest {
     BatchDocumentsInputConfig test_documents = 4;
   }
 
+  // Options to control the training of the Custom Document Extraction (CDE)
+  // Processor.
+  message CustomDocumentExtractionOptions {
+    // Training Method for CDE. TRAINING_METHOD_UNSPECIFIED will fallback to
+    // MODEL_BASED.
+    enum TrainingMethod {
+      TRAINING_METHOD_UNSPECIFIED = 0;
+
+      MODEL_BASED = 1;
+
+      TEMPLATE_BASED = 2;
+    }
+
+    // Training method to use for CDE training.
+    TrainingMethod training_method = 3;
+  }
+
+  oneof processor_flags {
+    // Options to control Custom Document Extraction (CDE) Processor.
+    CustomDocumentExtractionOptions custom_document_extraction_options = 5;
+  }
+
   // Required. The parent (project, location and processor) to create the new
   // version for. Format:
   // `projects/{project}/locations/{location}/processors/{processor}`.
@@ -904,7 +1014,8 @@ message TrainProcessorVersionRequest {
   // Optional. The schema the processor version will be trained with.
   DocumentSchema document_schema = 10 [(google.api.field_behavior) = OPTIONAL];
 
-  // Optional. The input data used to train the `ProcessorVersion`.
+  // Optional. The input data used to train the
+  // [ProcessorVersion][google.cloud.documentai.v1beta3.ProcessorVersion].
   InputData input_data = 4 [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. The processor version to use as a base for training. This
@@ -913,7 +1024,8 @@ message TrainProcessorVersionRequest {
   string base_processor_version = 8 [(google.api.field_behavior) = OPTIONAL];
 }
 
-// The response for the TrainProcessorVersion method.
+// The response for
+// [TrainProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.TrainProcessorVersion].
 message TrainProcessorVersionResponse {
   // The resource name of the processor version produced by training.
   string processor_version = 1;
@@ -941,7 +1053,7 @@ message TrainProcessorVersionMetadata {
     repeated google.rpc.Status dataset_errors = 2;
   }
 
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 1;
 
   // The training dataset validation information.
@@ -951,7 +1063,9 @@ message TrainProcessorVersionMetadata {
   DatasetValidation test_dataset_validation = 3;
 }
 
-// Request message for review document method.
+// Request message for the
+// [ReviewDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ReviewDocument]
+// method.
 message ReviewDocumentRequest {
   // The priority level of the human review task.
   enum Priority {
@@ -969,8 +1083,9 @@ message ReviewDocumentRequest {
     Document inline_document = 4;
   }
 
-  // Required. The resource name of the HumanReviewConfig that the document will
-  // be reviewed with.
+  // Required. The resource name of the
+  // [HumanReviewConfig][google.cloud.documentai.v1beta3.HumanReviewConfig] that
+  // the document will be reviewed with.
   string human_review_config = 1 [
     (google.api.field_behavior) = REQUIRED,
     (google.api.resource_reference) = {
@@ -991,7 +1106,9 @@ message ReviewDocumentRequest {
   DocumentSchema document_schema = 6;
 }
 
-// Response message for review document method.
+// Response message for the
+// [ReviewDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ReviewDocument]
+// method.
 message ReviewDocumentResponse {
   // Possible states of the review operation.
   enum State {
@@ -1016,9 +1133,11 @@ message ReviewDocumentResponse {
   string rejection_reason = 3;
 }
 
-// The long running operation metadata for review document method.
+// The long-running operation metadata for the
+// [ReviewDocument][google.cloud.documentai.v1beta3.DocumentProcessorService.ReviewDocument]
+// method.
 message ReviewDocumentOperationMetadata {
-  // State of the longrunning operation.
+  // State of the long-running operation.
   enum State {
     // Unspecified state.
     STATE_UNSPECIFIED = 0;
@@ -1052,14 +1171,16 @@ message ReviewDocumentOperationMetadata {
   // The last update time of the operation.
   google.protobuf.Timestamp update_time = 4;
 
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 5;
 
   // The Crowd Compute question ID.
   string question_id = 6;
 }
 
-// Evaluates the given ProcessorVersion against the supplied documents.
+// Evaluates the given
+// [ProcessorVersion][google.cloud.documentai.v1beta3.ProcessorVersion] against
+// the supplied documents.
 message EvaluateProcessorVersionRequest {
   // Required. The resource name of the
   // [ProcessorVersion][google.cloud.documentai.v1beta3.ProcessorVersion] to
@@ -1078,13 +1199,17 @@ message EvaluateProcessorVersionRequest {
       [(google.api.field_behavior) = OPTIONAL];
 }
 
-// Metadata of the EvaluateProcessorVersion method.
+// Metadata of the
+// [EvaluateProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.EvaluateProcessorVersion]
+// method.
 message EvaluateProcessorVersionMetadata {
-  // The basic metadata of the long running operation.
+  // The basic metadata of the long-running operation.
   CommonOperationMetadata common_metadata = 1;
 }
 
-// Metadata of the EvaluateProcessorVersion method.
+// Response of the
+// [EvaluateProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.EvaluateProcessorVersion]
+// method.
 message EvaluateProcessorVersionResponse {
   // The resource name of the created evaluation.
   string evaluation = 2;
@@ -1103,7 +1228,8 @@ message GetEvaluationRequest {
   ];
 }
 
-// Retrieves a list of evaluations for a given ProcessorVersion.
+// Retrieves a list of evaluations for a given
+// [ProcessorVersion][google.cloud.documentai.v1beta3.ProcessorVersion].
 message ListEvaluationsRequest {
   // Required. The resource name of the
   // [ProcessorVersion][google.cloud.documentai.v1beta3.ProcessorVersion] to
@@ -1117,8 +1243,8 @@ message ListEvaluationsRequest {
   ];
 
   // The standard list page size.
-  // If unspecified, at most 5 evaluations will be returned.
-  // The maximum value is 100; values above 100 will be coerced to 100.
+  // If unspecified, at most `5` evaluations are returned.
+  // The maximum value is `100`. Values above `100` are coerced to `100`.
   int32 page_size = 2;
 
   // A page token, received from a previous `ListEvaluations` call.
@@ -1126,7 +1252,7 @@ message ListEvaluationsRequest {
   string page_token = 3;
 }
 
-// The response from ListEvaluations.
+// The response from `ListEvaluations`.
 message ListEvaluationsResponse {
   // The evaluations requested.
   repeated Evaluation evaluations = 1;
@@ -1136,19 +1262,27 @@ message ListEvaluationsResponse {
   string next_page_token = 2;
 }
 
-// The request message for the ImportProcessorVersion method.
-// This method requires Document AI Service Agent of the destination project in
-// the source project's IAM with [Document AI Editor
-// role](https://cloud.google.com/document-ai/docs/access-control/iam-roles).
+// The request message for the
+// [ImportProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.ImportProcessorVersion]
+// method. Requirements:
 //
-// The destination project is specified as part of the `parent` field.
-// The source project is specified as part of `source` field.
+// - The source processor version and destination processor
+// must be in the same location.
+// - The Document AI [Service
+// Agent](https://cloud.google.com/iam/docs/service-agents) of the destination
+// project must have [Document AI Editor
+// role](https://cloud.google.com/document-ai/docs/access-control/iam-roles) on
+// the source project.
 //
-// The Service Agent for Document AI can be found in
-// https://cloud.google.com/iam/docs/service-agents.
+// The destination project is specified as part of the
+// [parent][google.cloud.documentai.v1beta3.ImportProcessorVersionRequest.parent]
+// field. The source project is specified as part of the
+// [source][google.cloud.documentai.v1beta3.ImportProcessorVersionRequest.processor_version_source]
+// field.
 message ImportProcessorVersionRequest {
   oneof source {
-    // The source processor version to import from.
+    // The source processor version to import from. The source processor version
+    // and destination processor need to be in the same environment and region.
     string processor_version_source = 2 [(google.api.resource_reference) = {
       type: "documentai.googleapis.com/ProcessorVersion"
     }];
@@ -1165,7 +1299,9 @@ message ImportProcessorVersionRequest {
   ];
 }
 
-// The response message for the ImportProcessorVersion method.
+// The response message for the
+// [ImportProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.ImportProcessorVersion]
+// method.
 message ImportProcessorVersionResponse {
   // The destination processor version name.
   string processor_version = 1 [(google.api.resource_reference) = {
@@ -1173,9 +1309,10 @@ message ImportProcessorVersionResponse {
   }];
 }
 
-// The long running operation metadata for the ImportProcessorVersion
+// The long-running operation metadata for the
+// [ImportProcessorVersion][google.cloud.documentai.v1beta3.DocumentProcessorService.ImportProcessorVersion]
 // method.
 message ImportProcessorVersionMetadata {
-  // The basic metadata for the long running operation.
+  // The basic metadata for the long-running operation.
   CommonOperationMetadata common_metadata = 1;
 }
diff --git a/google/cloud/documentai/v1beta3/document_schema.proto b/google/cloud/documentai/v1beta3/document_schema.proto
index b792319da..b685be5f2 100644
--- a/google/cloud/documentai/v1beta3/document_schema.proto
+++ b/google/cloud/documentai/v1beta3/document_schema.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -24,6 +24,18 @@ option java_package = "com.google.cloud.documentai.v1beta3";
 option php_namespace = "Google\\Cloud\\DocumentAI\\V1beta3";
 option ruby_package = "Google::Cloud::DocumentAI::V1beta3";
 
+// Metadata about a property.
+message PropertyMetadata {
+  // Whether the property should be considered as "inactive".
+  bool inactive = 3;
+}
+
+// Metadata about an entity type.
+message EntityTypeMetadata {
+  // Whether the entity type should be considered inactive.
+  bool inactive = 5;
+}
+
 // The schema defines the output of the processed document by a processor.
 message DocumentSchema {
   // EntityType is the wrapper of a label of the corresponding model with
@@ -38,20 +50,28 @@ message DocumentSchema {
 
     // Defines properties that can be part of the entity type.
     message Property {
-      // Types of occurrences of the entity type in the document.  Note: this
-      // represents the number of instances of an entity types, not number of
-      // mentions of a given entity instance.
+      // Types of occurrences of the entity type in the document.  This
+      // represents the number of instances of instances of an entity, not
+      // number of mentions of an entity.  For example, a bank statement may
+      // only have one `account_number`, but this account number may be
+      // mentioned in several places on the document.  In this case the
+      // 'account_number' would be considered a `REQUIRED_ONCE` entity type. If,
+      // on the other hand, we expect a bank statement to contain the status of
+      // multiple different accounts for the customers, the occurrence type will
+      // be set to `REQUIRED_MULTIPLE`.
       enum OccurrenceType {
         // Unspecified occurrence type.
         OCCURRENCE_TYPE_UNSPECIFIED = 0;
 
-        // There will be zero or one instance of this entity type.
+        // There will be zero or one instance of this entity type.  The same
+        // entity instance may be mentioned multiple times.
         OPTIONAL_ONCE = 1;
 
         // The entity type will appear zero or multiple times.
         OPTIONAL_MULTIPLE = 2;
 
-        // The entity type will only appear exactly once.
+        // The entity type will only appear exactly once.  The same
+        // entity instance may be mentioned multiple times.
         REQUIRED_ONCE = 3;
 
         // The entity type will appear once or more times.
@@ -69,6 +89,9 @@ message DocumentSchema {
       // Occurrence type limits the number of instances an entity type appears
       // in the document.
       OccurrenceType occurrence_type = 3;
+
+      // Any additional metadata about the property can be added here.
+      PropertyMetadata property_metadata = 5;
     }
 
     oneof value_source {
@@ -84,16 +107,15 @@ message DocumentSchema {
     string display_name = 13;
 
     // Name of the type. It must be unique within the schema file and
-    // cannot be a 'Common Type'.  Besides that we use the following naming
-    // conventions:
+    // cannot be a "Common Type".  The following naming conventions are used:
     //
-    // - *use `snake_casing`*
-    // - name matching is case-sensitive
+    // - Use `snake_casing`.
+    // - Name matching is case-sensitive.
     // - Maximum 64 characters.
     // - Must start with a letter.
     // - Allowed characters: ASCII letters `[a-z0-9_-]`.  (For backward
     //   compatibility internal infrastructure and tooling can handle any ascii
-    //   character)
+    //   character.)
     // - The `/` is sometimes used to denote a property of a type.  For example
     //   `line_item/amount`.  This convention is deprecated, but will still be
     //   honored for backward compatibility.
@@ -103,14 +125,17 @@ message DocumentSchema {
     // one should be set.
     repeated string base_types = 2;
 
-    // Describing the nested structure, or composition of an entity.
+    // Description the nested structure, or composition of an entity.
     repeated Property properties = 6;
+
+    // Metadata for the entity type.
+    EntityTypeMetadata entity_type_metadata = 11;
   }
 
   // Metadata for global schema behavior.
   message Metadata {
-    // If true, a `document` entity type can be applied to subdocument (
-    // splitting). Otherwise, it can only be applied to the entire document
+    // If true, a `document` entity type can be applied to subdocument
+    // (splitting). Otherwise, it can only be applied to the entire document
     // (classification).
     bool document_splitter = 1;
 
diff --git a/google/cloud/documentai/v1beta3/document_service.proto b/google/cloud/documentai/v1beta3/document_service.proto
new file mode 100644
index 000000000..8dcf239e3
--- /dev/null
+++ b/google/cloud/documentai/v1beta3/document_service.proto
@@ -0,0 +1,112 @@
+// Copyright 2023 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.cloud.documentai.v1beta3;
+
+import "google/api/annotations.proto";
+import "google/api/client.proto";
+import "google/api/field_behavior.proto";
+import "google/api/resource.proto";
+import "google/cloud/documentai/v1beta3/dataset.proto";
+import "google/cloud/documentai/v1beta3/operation_metadata.proto";
+import "google/longrunning/operations.proto";
+import "google/protobuf/field_mask.proto";
+
+option csharp_namespace = "Google.Cloud.DocumentAI.V1Beta3";
+option go_package = "cloud.google.com/go/documentai/apiv1beta3/documentaipb;documentaipb";
+option java_multiple_files = true;
+option java_outer_classname = "DocumentAiDocumentService";
+option java_package = "com.google.cloud.documentai.v1beta3";
+option php_namespace = "Google\\Cloud\\DocumentAI\\V1beta3";
+option ruby_package = "Google::Cloud::DocumentAI::V1beta3";
+
+// Service to call Cloud DocumentAI to manage document collection (dataset).
+service DocumentService {
+  option (google.api.default_host) = "documentai.googleapis.com";
+  option (google.api.oauth_scopes) =
+      "https://www.googleapis.com/auth/cloud-platform";
+
+  // Updates metadata associated with a dataset.
+  rpc UpdateDataset(UpdateDatasetRequest)
+      returns (google.longrunning.Operation) {
+    option (google.api.http) = {
+      patch: "/v1beta3/{dataset.name=projects/*/locations/*/processors/*/dataset}"
+      body: "dataset"
+    };
+    option (google.api.method_signature) = "dataset,update_mask";
+    option (google.longrunning.operation_info) = {
+      response_type: "Dataset"
+      metadata_type: "UpdateDatasetOperationMetadata"
+    };
+  }
+
+  // Gets the `DatasetSchema` of a `Dataset`.
+  rpc GetDatasetSchema(GetDatasetSchemaRequest) returns (DatasetSchema) {
+    option (google.api.http) = {
+      get: "/v1beta3/{name=projects/*/locations/*/processors/*/dataset/datasetSchema}"
+    };
+    option (google.api.method_signature) = "name";
+  }
+
+  // Updates a `DatasetSchema`.
+  rpc UpdateDatasetSchema(UpdateDatasetSchemaRequest) returns (DatasetSchema) {
+    option (google.api.http) = {
+      patch: "/v1beta3/{dataset_schema.name=projects/*/locations/*/processors/*/dataset/datasetSchema}"
+      body: "dataset_schema"
+    };
+    option (google.api.method_signature) = "dataset_schema,update_mask";
+  }
+}
+
+message UpdateDatasetRequest {
+  // Required. The `name` field of the `Dataset` is used to identify the
+  // resource to be updated.
+  Dataset dataset = 1 [(google.api.field_behavior) = REQUIRED];
+
+  // The update mask applies to the resource.
+  google.protobuf.FieldMask update_mask = 2;
+}
+
+message UpdateDatasetOperationMetadata {
+  // The basic metadata of the long running operation.
+  CommonOperationMetadata common_metadata = 1;
+}
+
+// Request for `GetDatasetSchema`.
+message GetDatasetSchemaRequest {
+  // Required. The dataset schema resource name.
+  // Format:
+  // projects/{project}/locations/{location}/processors/{processor}/dataset/datasetSchema
+  string name = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference) = {
+      type: "documentai.googleapis.com/DatasetSchema"
+    }
+  ];
+
+  // If set, only returns the visible fields of the schema.
+  bool visible_fields_only = 2;
+}
+
+// Request for `UpdateDatasetSchema`.
+message UpdateDatasetSchemaRequest {
+  // Required. The name field of the `DatasetSchema` is used to identify the
+  // resource to be updated.
+  DatasetSchema dataset_schema = 1 [(google.api.field_behavior) = REQUIRED];
+
+  // The update mask applies to the resource.
+  google.protobuf.FieldMask update_mask = 2;
+}
diff --git a/google/cloud/documentai/v1beta3/documentai_v1beta3.yaml b/google/cloud/documentai/v1beta3/documentai_v1beta3.yaml
index 58deb84ef..39aa11ab6 100644
--- a/google/cloud/documentai/v1beta3/documentai_v1beta3.yaml
+++ b/google/cloud/documentai/v1beta3/documentai_v1beta3.yaml
@@ -5,12 +5,14 @@ title: Cloud Document AI API
 
 apis:
 - name: google.cloud.documentai.v1beta3.DocumentProcessorService
+- name: google.cloud.documentai.v1beta3.DocumentService
 - name: google.cloud.location.Locations
 - name: google.longrunning.Operations
 
 types:
 - name: google.cloud.documentai.v1beta3.BatchProcessMetadata
 - name: google.cloud.documentai.v1beta3.BatchProcessResponse
+- name: google.cloud.documentai.v1beta3.Dataset
 - name: google.cloud.documentai.v1beta3.DeleteProcessorMetadata
 - name: google.cloud.documentai.v1beta3.DeleteProcessorVersionMetadata
 - name: google.cloud.documentai.v1beta3.DeployProcessorVersionMetadata
@@ -31,6 +33,7 @@ types:
 - name: google.cloud.documentai.v1beta3.TrainProcessorVersionResponse
 - name: google.cloud.documentai.v1beta3.UndeployProcessorVersionMetadata
 - name: google.cloud.documentai.v1beta3.UndeployProcessorVersionResponse
+- name: google.cloud.documentai.v1beta3.UpdateDatasetOperationMetadata
 
 documentation:
   summary: |-
@@ -73,6 +76,10 @@ authentication:
     oauth:
       canonical_scopes: |-
         https://www.googleapis.com/auth/cloud-platform
+  - selector: 'google.cloud.documentai.v1beta3.DocumentService.*'
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/cloud-platform
   - selector: google.cloud.location.Locations.GetLocation
     oauth:
       canonical_scopes: |-
diff --git a/google/cloud/documentai/v1beta3/documentai_v1beta3_grpc_service_config.json b/google/cloud/documentai/v1beta3/documentai_v1beta3_grpc_service_config.json
index ad5e39478..e002f3b34 100644
--- a/google/cloud/documentai/v1beta3/documentai_v1beta3_grpc_service_config.json
+++ b/google/cloud/documentai/v1beta3/documentai_v1beta3_grpc_service_config.json
@@ -5,7 +5,21 @@
         {
           "service": "google.cloud.documentai.v1beta3.DocumentProcessorService",
           "method": "ProcessDocument"
-        },
+        }
+      ],
+      "timeout": "300s",
+      "retryPolicy": {
+        "initialBackoff": "0.100s",
+        "maxBackoff": "60s",
+        "backoffMultiplier": 1.3,
+        "retryableStatusCodes": [
+          "DEADLINE_EXCEEDED",
+          "UNAVAILABLE"
+        ]
+      }
+    },
+    {
+      "name": [
         {
           "service": "google.cloud.documentai.v1beta3.DocumentProcessorService",
           "method": "BatchProcessDocuments"
diff --git a/google/cloud/documentai/v1beta3/evaluation.proto b/google/cloud/documentai/v1beta3/evaluation.proto
index e5087c818..4de7046b6 100644
--- a/google/cloud/documentai/v1beta3/evaluation.proto
+++ b/google/cloud/documentai/v1beta3/evaluation.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/google/cloud/documentai/v1beta3/geometry.proto b/google/cloud/documentai/v1beta3/geometry.proto
index 05eeac9c4..da949fb19 100644
--- a/google/cloud/documentai/v1beta3/geometry.proto
+++ b/google/cloud/documentai/v1beta3/geometry.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/google/cloud/documentai/v1beta3/operation_metadata.proto b/google/cloud/documentai/v1beta3/operation_metadata.proto
index e8f757a54..509109aba 100644
--- a/google/cloud/documentai/v1beta3/operation_metadata.proto
+++ b/google/cloud/documentai/v1beta3/operation_metadata.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/google/cloud/documentai/v1beta3/processor.proto b/google/cloud/documentai/v1beta3/processor.proto
index 7de236e1f..bafcdc0f4 100644
--- a/google/cloud/documentai/v1beta3/processor.proto
+++ b/google/cloud/documentai/v1beta3/processor.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -31,10 +31,9 @@ option php_namespace = "Google\\Cloud\\DocumentAI\\V1beta3";
 option ruby_package = "Google::Cloud::DocumentAI::V1beta3";
 
 // A processor version is an implementation of a processor. Each processor
-// can have multiple versions, pre-trained by Google internally or up-trained
-// by the customer. At a time, a processor can only have one default version
-// version. So the processor's behavior (when processing documents) is defined
-// by a default version
+// can have multiple versions, pretrained by Google internally or uptrained
+// by the customer. A processor can only have one default version at a time.
+// Its document-processing behavior is defined by that version.
 message ProcessorVersion {
   option (google.api.resource) = {
     type: "documentai.googleapis.com/ProcessorVersion"
@@ -78,6 +77,9 @@ message ProcessorVersion {
 
     // The processor version failed and is in an indeterminate state.
     FAILED = 7;
+
+    // The processor version is being imported.
+    IMPORTING = 8;
   }
 
   // The resource name of the processor version.
@@ -106,7 +108,7 @@ message ProcessorVersion {
   // The KMS key version with which data is encrypted.
   string kms_key_version_name = 10;
 
-  // Denotes that this ProcessorVersion is managed by google.
+  // Denotes that this `ProcessorVersion` is managed by Google.
   bool google_managed = 11;
 
   // If set, information about the eventual deprecation of this version.
@@ -163,8 +165,8 @@ message Processor {
     (google.api.field_behavior) = OUTPUT_ONLY
   ];
 
-  // The processor type, e.g., `OCR_PROCESSOR`, `INVOICE_PROCESSOR`, etc.
-  // To get a list of processors types, see
+  // The processor type, such as: `OCR_PROCESSOR`, `INVOICE_PROCESSOR`.
+  // To get a list of processor types, see
   // [FetchProcessorTypes][google.cloud.documentai.v1beta3.DocumentProcessorService.FetchProcessorTypes].
   string type = 2;
 
@@ -189,7 +191,7 @@ message Processor {
   // The time the processor was created.
   google.protobuf.Timestamp create_time = 7;
 
-  // The KMS key used for encryption/decryption in CMEK scenarios.
-  // See https://cloud.google.com/security-key-management.
+  // The [KMS key](https://cloud.google.com/security-key-management) used for
+  // encryption and decryption in CMEK scenarios.
   string kms_key_name = 8;
 }
diff --git a/google/cloud/documentai/v1beta3/processor_type.proto b/google/cloud/documentai/v1beta3/processor_type.proto
index 0ff23ffaf..2840eb085 100644
--- a/google/cloud/documentai/v1beta3/processor_type.proto
+++ b/google/cloud/documentai/v1beta3/processor_type.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -37,7 +37,8 @@ message ProcessorType {
 
   // The location information about where the processor is available.
   message LocationInfo {
-    // The location id, currently must be one of [us, eu].
+    // The location ID. For supported locations, refer to [regional and
+    // multi-regional support](/document-ai/docs/regions).
     string location_id = 1;
   }
 
@@ -45,7 +46,7 @@ message ProcessorType {
   // Format: `projects/{project}/processorTypes/{processor_type}`
   string name = 1;
 
-  // The processor type, e.g., `OCR_PROCESSOR`, `INVOICE_PROCESSOR`, etc.
+  // The processor type, such as: `OCR_PROCESSOR`, `INVOICE_PROCESSOR`.
   string type = 2;
 
   // The processor category, used by UI to group processor types.