Why won't this validate?!!

[AliHurworth]

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?

<?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>

[AliHurworth]

It needed an overall wrapper and the closing </xml> tag is not required .

<?xml version="1.0" encoding="utf-8"?>
	<donorDetails>
		<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>
	</donorDetails>