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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Proto to test proto3 maps.
+syntax = "proto3";
+
+package google.protobuf.testing.maps;
+option java_package = "com.google.protobuf.testing.maps";
+
+message MapIn {
+  string other = 1;
+  repeated string things = 2;
+  map<string, string> map_input = 3;
+}
+
+message MapOut {
+  map<string, MapM> map1 = 1;
+  map<string, MapOut> map2 = 2;
+  map<int32, string> map3 = 3;
+  map<bool, string> map4 = 5;
+  string bar = 4;
+}
+
+// A message with exactly the same wire representation as MapOut, but using
+// repeated message fields instead of map fields. We use this message to test
+// the wire-format compatibility of the JSON transcoder (e.g., whether it
+// handles missing keys correctly).
+message MapOutWireFormat {
+  message Map1Entry {
+    string key = 1;
+    MapM value = 2;
+  }
+  repeated Map1Entry map1 = 1;
+  message Map2Entry {
+    string key = 1;
+    MapOut value = 2;
+  }
+  repeated Map2Entry map2 = 2;
+  message Map3Entry {
+    int32 key = 1;
+    string value = 2;
+  }
+  repeated Map3Entry map3 = 3;
+  message Map4Entry {
+    bool key = 1;
+    string value = 2;
+  }
+  repeated Map4Entry map4 = 5;
+  string bar = 4;
+}
+
+message MapM {
+  string foo = 1;
+}
+
+service TestService {
+  rpc Call1(MapIn) returns (MapOut);
+  rpc Call2(MapIn) returns (MapOut);
+}