ble Encoding String according
 to the algorithm defined in <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.

 <p>If the transformation fails (because the input is not a valid IDN), an
 exception will be thrown.

 <p>This method can handle either an individual label or an entire domain name.
 In the latter case, the separators are: U+002E (full stop), U+3002 (ideographic full stop),
 U+FF0E (fullwidth full stop), and U+FF61 (halfwidth ideographic full stop).
 All of these will become U+002E (full 