Web Services Input

Hi All.
I'm trying to write a new Web Service.
It is a order contained in the body of the soap message.
How do I read the data within the soap message?
Below is a extract from the soap message.

TEST
SECRET
MSG-123

4012345500004

5412345000013

5412345000013

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-
-

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-
-
0400312345
ALLOCATION
0000001114

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-
6001095000000

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6001007031999

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-
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6001007031015

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-
2007-05-31

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1.000
-
69.54

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16001756000000
-
710008

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WIDGET SIXPACK 500GR

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-
10.00

-
-
5.00

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-
2.50

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79.28