def writexml(self, filename_or_file=None, indent="  ", newl=os.linesep, 
                 encoding="UTF-8"):
        """ Write the manifest as XML to a file or file object """
        if not filename_or_file:
            filename_or_file = self.filename
        if isinstance(filename_or_file, (str, unicode)):
            filename_or_file = open(filename_or_file, "wb")
        xmlstr = self.toxml(indent, newl, encoding)
        filename_or_file.write(xmlstr)
        filename_or_file.close()
Write the manifest as XML to a file or file object