How can Delphi understand nillable int via SOAP?

Question

Possible duplicate:
Web service null value for type Int64

I have a WebService with C # and it should be accessible through the Delphi Desktop application.

<s:element minOccurs="1" maxOccurs="1" name="ParamName" nillable="true" type="s:int" /> 

But it looks like Delphi cannot handle nillable ints defined in WSDL. How can i do this?