XML query returning NULL values for the given query

Hi All,

I have an XML field in the  table like this and I am trying to read the values using the following query.

But the query returns NULL across the records. Please let me know where I am going wrong.

<root xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><Header xmlns="http://schemas.datacontract.org/2004/07/ABC.Fabric.Services.Messages"><UserDeviceId>1</UserDeviceId><CorrelationId>71fb0504-d58f-4640-aecc-912100f7e85e</CorrelationId><DeviceId>SLATE_1</DeviceId><SentDateTime>2012-11-09T15:29:15.6040269+11:00</SentDateTime><ShiftId>1</ShiftId><UserName>UATUser</UserName></Header></root>

SELECT XMLMessage,
XMLMessage.value('(./UserDeviceId/node())[1]', 'int') as CopsDeviceId,
XMLMessage.value('(./CorrelationId/node())[1]', 'NVARCHAR(MAX)') as CorrelationId,
XMLMessage.value('(./DeviceId/node())[1]', 'int') as DeviceId,
XMLMessage.value('(./SentDateTime/node())[1]', 'DATETIME') as SentDateTime,
XMLMessage.value('(./ShiftId/node())[1]', 'int') as ShiftId,
XMLMessage.value('(./UserName/node())[1]', 'NVARCHAR(MAX)') as UserName
FROM rollingLog

Thanks
M.Mahendra

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