webservices with multiple structures

[Brent]

I have the following code, in an asmx file:

Public Structure ThreePartOffer
Public startTime As DateTime
Public endTime As DateTime
Public expirationTime As DateTime
Public resource As String
Public combinedCycle As String
Structure FipFop
Public startTime As DateTime
Public endTime As DateTime
Public fippercent As Decimal
Public foppercent As Decimal
End Structure
Structure StartupCost
Public startTime As DateTime
Public endTime As DateTime
Public hot As Decimal
Public inttermediate As Decimal
Public cold As Decimal
End Structure
Structure MinimumEnergy
Public startTime As DateTime
Public endTime As DateTime
Public cost As Decimal
End Structure
Public Structure EnergyOfferCurve
Public startTime As DateTime
Public endTime As DateTime
Public curveStyle As String
Public Structure CurveData
Public xvalue As Double
Public y1value As Double
End Structure
Public incExcFlag As String
End Structure
End Structure

I am trying to make a variable, say TPO, that I can assign values to every
type under ThreePartOffer and return this at the request of webservices as
an XML file with the format below. Is this possible? The XML code looks
like the
following:

- <ThreePartOffer>
<startTime>2008-01-01T00:00:00-06:00</startTime>
<endTime>2008-01-02T00:00:00-06:00</endTime>
<expirationTime>2007-12-31T04:00:00-06:00</expirationTime>
<resource>AcmeUnit1</resource>
<combinedCycle>AcmeCC</combinedCycle>
- <FipFop>
<startTime>2008-01-01T00:00:00-06:00</startTime>
<endTime>2008-01-02T00:00:00-06:00</endTime>
<fipPercent>50</fipPercent>
<fopPercent>50</fopPercent>
</FipFop>
- <StartupCost>
<startTime>2008-01-01T00:00:00-06:00</startTime>
<endTime>2008-01-02T00:00:00-06:00</endTime>
<hot>333.33</hot>
<intermediate>444.44</intermediate>
<cold>666.66</cold>
</StartupCost>
- <MinimumEnergy>
<startTime>2008-01-01T00:00:00-06:00</startTime>
<endTime>2008-01-02T00:00:00-06:00</endTime>
<cost>1001.11</cost>
</MinimumEnergy>
- <EnergyOfferCurve>
<startTime>2008-01-01T00:00:00-06:00</startTime>
<endTime>2008-01-01T10:00:00-06:00</endTime>
<curveStyle>CURVE</curveStyle>
- <CurveData>
<xvalue>60</xvalue>
<y1value>40.00</y1value>
</CurveData>
- <CurveData>
<xvalue>80</xvalue>
<y1value>45.00</y1value>
</CurveData>
<incExcFlag>INC</incExcFlag>
</EnergyOfferCurve>
</ThreePartOffer>

Or any other approaches for an asmx file. Thank you.

Brent