returns the result of interpreting the object as an instance of ` date version ' . this implementation returns null ; returning a non-null result will terminate the switch . concode_field_sep Bz277546Package modelPackage concode_field_sep T caseSimpleVersion concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T caseAnotherVersion concode_elem_sep T defaultCase
T function ( DateVersion arg0 ) { return null ; }