code: @Nonnull
    public static ESuccess writeToStream (@Nonnull final IMicroNode aNode, @Nonnull @WillClose final OutputStream aOS)
    {
      return writeToStream (aNode, aOS, XMLWriterSettings.DEFAULT_XML_SETTINGS);
    }
docs: Write a Micro Node to an output stream using the default settings.
  
  @param aNode
  The node to be serialized. May be any kind of node (incl.
  documents). May not be <code>null</code>.
  @param aOS
  The output stream to write to. May not be <code>null</code>. The
  output stream is closed anyway directly after the operation finishes
  (on success and on error).
  @return {@link ESuccess}