The feed should always contain a header section as follows:

<?xml version="1.0" encoding="UTF-8"?>
	<properties>
		<feed>
			<version>1.5</version>
			<generated>YYYY-MM-DD hh:mm:ss</generated> (e.g. ‘2015-07-04 17:32:30’)
			<source>abcdefgh</source> (optional – e.g. ‘inmoba’)
		</feed>