// operation in the constructor.
  //
  // 1. In the listener that performs the callback. In this case it is fine since inputFuture is
  //    assigned prior to calling addListener, and addListener happens-before any invocation of the
  //    listener. Notably, this means that 'volatile' is unnecessary to make 'inputFuture' visible
  //    to the listener.
  //

   * java.util.TreeMap}).
   *
   * <p>Each method invocation on the set returned by this method results in exactly one method
   * invocation on the backing map or its {@code keySet} view, with one exception. The {@code
   * addAll} method is implemented as a sequence of {@code put} invocations on the backing map.
   *

				"application/vnd.oma.poc.detailed-progress-report+xml",
				"application/vnd.oma.poc.final-report+xml",
				"application/vnd.oma.poc.groups+xml",
				"application/vnd.oma.poc.invocation-descriptor+xml",
				"application/vnd.oma.poc.optimized-progress-report+xml",
				"application/vnd.oma.xcap-directory+xml",
				"application/vnd.omads-email+xml",
				"application/vnd.omads-file+xml",