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diff --git a/cmd/release_config/release_config_proto/build_flags_src.proto b/cmd/release_config/release_config_proto/build_flags_src.proto
new file mode 100644
index 000000000..0ef1a5ffa
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+++ b/cmd/release_config/release_config_proto/build_flags_src.proto
@@ -0,0 +1,151 @@
+// 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 = "proto2";
+package android.release_config_proto;
+option go_package = "android/soong/release_config/release_config_proto";
+
+// This protobuf file defines messages used to represent the build flags used by
+// a release in a more human-editable form.  It is used for on-disk files in the
+// source tree.
+//
+// The following format requirements apply across various message fields:
+//
+// # name: name of the flag
+//
+//    format: an uppercase string in SNAKE_CASE format starting with RELEASE_,
+//      no consecutive underscores, and no leading digit. For example
+//      RELEASE_MY_PACKAGE_FLAG is a valid name, while MY_PACKAGE_FLAG, and
+//      RELEASE_MY_PACKAGE__FLAG are invalid.
+//
+// # namespace: namespace the flag belongs to
+//
+//    format: a lowercase string in snake_case format, no consecutive underscores, and no leading
+//      digit. For example android_bar_system
+//
+// # package: package to which the flag belongs
+//
+//    format: lowercase strings in snake_case format, delimited by dots, no
+//      consecutive underscores and no leading digit in each string. For example
+//      com.android.mypackage is a valid name while com.android.myPackage,
+//      com.android.1mypackage are invalid
+
+enum workflow {
+  UNSPECIFIED_workflow = 0;
+
+  // Boolean value flags that progress from false to true.
+  LAUNCH = 1;
+
+  // String value flags that get updated with new version strings to control
+  // prebuilt inclusion.
+  PREBUILT = 2;
+
+  // Manually managed outside flags.  These are likely to be found in a
+  // different directory than flags with other workflows.
+  MANUAL = 3;
+}
+
+message value {
+  oneof val {
+    bool unspecified_value = 200;
+    string string_value = 201;
+    bool bool_value = 202;
+    // If true, the flag is obsolete.  Assigning it further will be flagged.
+    bool obsolete = 203;
+  }
+}
+
+// The proto used in the source tree.
+message flag_declaration {
+  // The name of the flag.
+  // See # name for format detail
+  optional string name = 1;
+
+  // Namespace the flag belongs to (required)
+  // See # namespace for format detail
+  optional string namespace = 2;
+
+  // Text description of the flag's purpose.
+  optional string description = 3;
+
+  // reserve this for bug, if needed.
+  reserved 4;
+
+  // Value for the flag
+  optional value value = 201;
+
+  // Workflow for this flag.
+  optional workflow workflow = 205;
+
+  // The container for this flag.  This overrides any default container given
+  // in the release_config_map message.
+  repeated string containers = 206;
+
+  // The package associated with this flag.
+  // (when Gantry is ready for it) optional string package = 207;
+  reserved 207;
+}
+
+message flag_value {
+  // Name of the flag.
+  // See # name for format detail
+  optional string name = 2;
+
+  // Value for the flag
+  optional value value = 201;
+
+  // If true, the flag is completely removed from the release config as if
+  // never declared.
+  optional bool redacted = 202;
+}
+
+// This replaces $(call declare-release-config).
+message release_config {
+  // The name of the release config.
+  // See # name for format detail
+  optional string name = 1;
+
+  // From which other release configs does this one inherit?
+  repeated string inherits = 2;
+
+  // List of names of the aconfig_value_set soong module(s) for this
+  // contribution.
+  repeated string aconfig_value_sets = 3;
+
+  // Only aconfig flags are allowed in this release config.
+  optional bool aconfig_flags_only = 4;
+}
+
+// Any aliases.  These are used for continuous integration builder config.
+message release_alias {
+  // The name of the alias.
+  optional string name = 1;
+
+  // The release that `name` is an alias for.
+  optional string target = 2;
+}
+
+// This provides the data from release_config_map.mk
+message release_config_map {
+  // Any aliases.
+  repeated release_alias aliases = 1;
+
+  // Description of this map and its intended use.
+  optional string description = 2;
+
+  // The default container for flags declared here.
+  repeated string default_containers = 3;
+
+  // If needed, we can add these fields instead of hardcoding the location.
+  // Flag declarations: `flag_declarations/*.textproto`
+  // Release config contributions: `release_configs/*.textproto`
+  // Flag values: `flag_values/{RELEASE_NAME}/*.textproto`
+}