US Patent 7712022 Mutually exclusive options in electronic forms

Systems and methods enabling creation and/or use of an electronic form capable of allowing a user to select from mutually exclusive options without the electronic form being in an invalid state are described. One of the described electronic forms remains valid to its schema by atomic swapping of data substructures corresponding to the form's mutually exclusive options. A method and a user interface for creating some of these electronic forms are also described.