returns the result of interpretting the object as an instance of ` element ' . this implementation returns null ; returning a non-null result will terminate the switch . concode_field_sep ConstraintsPackage modelPackage concode_field_sep T caseForeignKey concode_elem_sep T caseIndexedColumn concode_elem_sep T caseUniqueConstraint concode_elem_sep T caseCheckConstraint concode_elem_sep T caseIndex concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T caseConstraint concode_elem_sep T casePrimaryKey concode_elem_sep T defaultCase concode_elem_sep T caseNamedElement concode_elem_sep T caseColumnRefConstraint
T function ( Element arg0 ) { return null ; }