mixed $newFile: filename for beautified XML file (if none is given, the XML string will be returned.) if you want overwrite the original file, use XML_BEAUTIFIER_OVERWRITE
string $renderer: Renderer to use, default is the plain xml renderer
Info
return - XML string of no file should be written, true if file could be written
throws - PEAR_Error
access - public
uses - _loadRenderer() - to load the desired renderer