Introduced default field prefix of '!', which can be overridden with WebDataBinder#setFieldDefaultPrefix. If a field is otherwise not present, the default value is used for the field. Field markers for the same field are ignored.
git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@576 50f2f4bb-b051-0410-bef5-90022cba6387