String Mapping
When the mappings element contains a user-specified type for xsd:string, the generated classes use the specified string type wherever a class requires a string. The exception to this rule is the marshaling methods, which do the following:
The marshal() method signatures use the base string type, which is std:string for code generated with the -stl option, and RWCString for code generated with the -sourcepro option.The unmarshal() method signatures have one overload that uses the base string type, and one overload that uses the specified string type.
