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diff --git a/Firestore/Protos/protos/google/firestore/v1beta1/write.proto b/Firestore/Protos/protos/google/firestore/v1beta1/write.proto
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+// Copyright 2017 Google Inc.
+//
+// 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.firestore.v1beta1;
+
+import "google/api/annotations.proto";
+import "google/firestore/v1beta1/common.proto";
+import "google/firestore/v1beta1/document.proto";
+import "google/protobuf/timestamp.proto";
+
+option csharp_namespace = "Google.Cloud.Firestore.V1Beta1";
+option go_package = "google.golang.org/genproto/googleapis/firestore/v1beta1;firestore";
+option java_multiple_files = true;
+option java_outer_classname = "WriteProto";
+option java_package = "com.google.firestore.v1beta1";
+option objc_class_prefix = "GCFS";
+
+
+// A write on a document.
+message Write {
+  // The operation to execute.
+  oneof operation {
+    // A document to write.
+    Document update = 1;
+
+    // A document name to delete. In the format:
+    // `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
+    string delete = 2;
+
+    // The name of a document on which to verify the `current_document`
+    // precondition.
+    // This only requires read access to the document.
+    string verify = 5;
+
+    // Applies a tranformation to a document.
+    // At most one `transform` per document is allowed in a given request.
+    // An `update` cannot follow a `transform` on the same document in a given
+    // request.
+    DocumentTransform transform = 6;
+  }
+
+  // The fields to update in this write.
+  //
+  // This field can be set only when the operation is `update`.
+  // None of the field paths in the mask may contain a reserved name.
+  // If the document exists on the server and has fields not referenced in the
+  // mask, they are left unchanged.
+  // Fields referenced in the mask, but not present in the input document, are
+  // deleted from the document on the server.
+  // The field paths in this mask must not contain a reserved field name.
+  DocumentMask update_mask = 3;
+
+  // An optional precondition on the document.
+  //
+  // The write will fail if this is set and not met by the target document.
+  Precondition current_document = 4;
+}
+
+// A transformation of a document.
+message DocumentTransform {
+  // A transformation of a field of the document.
+  message FieldTransform {
+    // A value that is calculated by the server.
+    enum ServerValue {
+      // Unspecified. This value must not be used.
+      SERVER_VALUE_UNSPECIFIED = 0;
+
+      // The time at which the server processed the request.
+      REQUEST_TIME = 1;
+    }
+
+    // The path of the field. See [Document.fields][google.firestore.v1beta1.Document.fields] for the field path syntax
+    // reference.
+    string field_path = 1;
+
+    // The transformation to apply on the field.
+    oneof transform_type {
+      // Sets the field to the given server value.
+      ServerValue set_to_server_value = 2;
+    }
+  }
+
+  // The name of the document to transform.
+  string document = 1;
+
+  // The list of transformations to apply to the fields of the document, in
+  // order.
+  repeated FieldTransform field_transforms = 2;
+}
+
+// The result of applying a write.
+message WriteResult {
+  // The last update time of the document after applying the write. Not set
+  // after a `delete`.
+  //
+  // If the write did not actually change the document, this will be the
+  // previous update_time.
+  google.protobuf.Timestamp update_time = 1;
+
+  // The results of applying each [DocumentTransform.FieldTransform][google.firestore.v1beta1.DocumentTransform.FieldTransform], in the
+  // same order.
+  repeated Value transform_results = 2;
+}
+
+// A [Document][google.firestore.v1beta1.Document] has changed.
+//
+// May be the result of multiple [writes][google.firestore.v1beta1.Write], including deletes, that
+// ultimately resulted in a new value for the [Document][google.firestore.v1beta1.Document].
+//
+// Multiple [DocumentChange][google.firestore.v1beta1.DocumentChange] messages may be returned for the same logical
+// change, if multiple targets are affected.
+message DocumentChange {
+  // The new state of the [Document][google.firestore.v1beta1.Document].
+  //
+  // If `mask` is set, contains only fields that were updated or added.
+  Document document = 1;
+
+  // A set of target IDs of targets that match this document.
+  repeated int32 target_ids = 5;
+
+  // A set of target IDs for targets that no longer match this document.
+  repeated int32 removed_target_ids = 6;
+}
+
+// A [Document][google.firestore.v1beta1.Document] has been deleted.
+//
+// May be the result of multiple [writes][google.firestore.v1beta1.Write], including updates, the
+// last of which deleted the [Document][google.firestore.v1beta1.Document].
+//
+// Multiple [DocumentDelete][google.firestore.v1beta1.DocumentDelete] messages may be returned for the same logical
+// delete, if multiple targets are affected.
+message DocumentDelete {
+  // The resource name of the [Document][google.firestore.v1beta1.Document] that was deleted.
+  string document = 1;
+
+  // A set of target IDs for targets that previously matched this entity.
+  repeated int32 removed_target_ids = 6;
+
+  // The read timestamp at which the delete was observed.
+  //
+  // Greater or equal to the `commit_time` of the delete.
+  google.protobuf.Timestamp read_time = 4;
+}
+
+// A [Document][google.firestore.v1beta1.Document] has been removed from the view of the targets.
+//
+// Sent if the document is no longer relevant to a target and is out of view.
+// Can be sent instead of a DocumentDelete or a DocumentChange if the server
+// can not send the new value of the document.
+//
+// Multiple [DocumentRemove][google.firestore.v1beta1.DocumentRemove] messages may be returned for the same logical
+// write or delete, if multiple targets are affected.
+message DocumentRemove {
+  // The resource name of the [Document][google.firestore.v1beta1.Document] that has gone out of view.
+  string document = 1;
+
+  // A set of target IDs for targets that previously matched this document.
+  repeated int32 removed_target_ids = 2;
+
+  // The read timestamp at which the remove was observed.
+  //
+  // Greater or equal to the `commit_time` of the change/delete/remove.
+  google.protobuf.Timestamp read_time = 4;
+}
+
+// A digest of all the documents that match a given target.
+message ExistenceFilter {
+  // The target ID to which this filter applies.
+  int32 target_id = 1;
+
+  // The total count of documents that match [target_id][google.firestore.v1beta1.ExistenceFilter.target_id].
+  //
+  // If different from the count of documents in the client that match, the
+  // client must manually determine which documents no longer match the target.
+  int32 count = 2;
+}