title: Storing multiple messages in one protocol buffer binary file
body: <p>I have repeating messages which I want to store in a single file. Currently I have to wrap this repeating message in another message. Is there a way around this?</p>
  
  <pre><code>package foo;
  
  message Box {
    required int32 tl_x = 1;
    required int32 tl_y = 2;
    required int32 w = 3;
    required int32 h = 4;
  }
  
  message Boxes {
    repeated Box boxes = 1;
  }
  </code></pre>