Seems straightforward enough. But it won't display in Firefox saying:
XML Parsing Error: junk after document element
Location: file:///C:/Users/Main/Documents/desko/src/appt.xml
Line Number 10, Column 2: <apptDetails>
--------^
...and nor will it validate at XML Validome.

What is wrong? Is it whitespace?
Code:
<?xml version="1.0" encoding="utf-8"?>
	<nameDetails>
		<firstName>
			Ali
		</firstName>
		<secondName>
			Hurworth
		</secondName>
	</nameDetails>
	<apptDetails>
		<apptDate>
			01052009
		</apptDate>
		<apptTime>
			1735
		</apptTime>
	</apptDetails>
	<nSession>
		<session>
			Bentley Pavilion
		</session>
		<sessionPostcode>
			DN5 9AA
		</sessionPostcode>
		<postCode>
			DN5
		</postCode>
	</nSession>
</xml>