A form is received and loaded. It is determined if a schema structure definition defines one or more choice elements for data of the form. A data structure is created for the data, the data structure includes both a schema structure valid component and a non-validated component. When a user selects one of the choice elements, a first set of zero or more data elements corresponding to the selected choice element are loaded into the schema structure valid component of the data structure. The previous set of zero or more data elements and values associated with the previous set of data elements are then stored in the non-validated component of the data structure.