returns the result of interpreting the object as an instance of ` error node ' . this implementation returns null ; returning a non-null result will terminate the switch . concode_field_sep QVTCSTPackage modelPackage concode_field_sep T caseIdentifiedCS concode_elem_sep T caseIHasName concode_elem_sep T caseIdentifierCS concode_elem_sep T caseCSTNode concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T defaultCase
T function ( ErrorNode arg0 ) { return null ; }