web service returns xmlnode

When defining the web service event I could not get the right return parameter type. This is the code it generates. The webservice returns xmlnode. What type of datatype do I define in K2 XMLField to get the value in the return XML? :oops:

ompiling GetSupervisor(Event)...
Compile Error: GetSupervisor(Event) Line 14: Value of type 'System.Xml.XmlNode' cannot be converted to 'String'.
Compile Error: GetSupervisor(Event) Line 15: Identifier expected.



Sub Main(ByVal K2 As ServerEventContext)
K2.Synchronous = True
CallWebService(K2)
End Sub

Sub CallWebService(ByVal K2 As ServerEventContext)
Dim oWebService As New DataAccess

Try
Dim Param0 as System.String = K2.ProcessInstance.DataFields("WhoIsItFor").Value

oWebService.Url = "http://" & K2.StringTable("WebAppServer") & "/webservices/dataaccess.asmx"
oWebService.Credentials = SourceCode.K2Utilities.GeneralMod.GetCredentials(oWebService.Url)
K2.ProcessInstance.XmlFields("GetSupervisor").Value = SourceCode.K2Utilities.XMLFieldMod.SetXMLValue(K2.ProcessInstance.XmlFields("GetSupervisor").Value, "Root", oWebService.GetSupervisor(Param0))
SourceCode.K2Utilities.XMLFieldMod.

Catch ex As Exception
Throw ex
Finally
oWebService = Nothing
End Try
End Sub

The web service returns this:

<?xml version="1.0" encoding="utf-8" ?>
- <SUPERVISOR>
- <ROW>
<NAME>Yao, Peter</NAME>
</ROW>
</SUPERVISOR>