Text serializer converts XML into plain text.
It omits all XML tags and writes only character events to the output.
Internally, text serializer uses XML serializer with
OutputKeys.METHOD set to text.
Input document must have at least one element - root element - which
should wrap all the text inside it.
author: Stefano Mazzocchi version: $Id: TextSerializer.java 433543 2006-08-22 06:22:54Z crossley $