Assume that my XSD defines MiddleNames as minOccurs=0, maxOccurs=1,
nillable=true.  From my XSD and WSDL, I am using WSDL.EXE to create a Server
Interface which I can then implement.  All ok so far.  But, I need to be
able to differentiate between these three scenarios of incoming data:

<Record>
 <FirstName>Fred</FirstName>
 <MiddleNames>George Oliver</MiddleNames>
<Record>

<Record>
 <FirstName>Fred</FirstName>
<Record>

<Record>
 <FirstName>Fred</FirstName>
 <MiddleNames xsi:nil="true" />
<Record>

The intention is that the first example will update the MiddleNames value,
the second will leave it unchanged and the third will remove it.  I had
rather hoped that the generated VB .NET code would provide a property value
allowing me to differentiate between the second and third examples.    It
seems that such a property is not generated, making it impossible to tell
the two examples apart.

Am I missing something?  Alternatively is there a better way to do the
"leave it unchanged" scenario (my second example)?  I don't really want to
go down the line of having all the elements passed in every time.

Thanks