message <span class="message">BacktraceSelection</span>
{
  required <span class="number">uint32</span> runtimeID = 1; 
  required <span class="number">uint32</span> threadID  = 2; 
  <span class="comment">/** 
   * If omitted (or 0) all frames are returned.
   */</span>
  optional <span class="number">uint32</span> maxFrames = 3; 
}
