Forum OpenACS Development: Re: Tcl Web Services Toolkit: TWiST
"for a type "float" it's not possible to have an empty value, set to 0 instead
Not sure if this is according to standard WSDL or application specific on the other's side. I can put all of that on a separate page for other developers what I had to keep in mind when dealing with WSDL in general and TWiST in particular, as I am sure I will miss a couple of more things.
Or you can define a new type which allows the empty string. All built in numeric types in TWiST and tWSDL do not allow an empty string (like string is -strict), for obvious reasons.