Writer.pm - write an XML document.

Copyright (c) 1999 by Megginson Technologies.
Copyright (c) 2003 Ed Avis <ed@membled.com>
Copyright (c) 2004-2010 Joseph Walton <joe@kafsemo.org>

Redistribution and use in source and compiled forms, with or without
modification, are permitted under any circumstances.  No warranty.
