DSL for Operator Order Processing (1)

$oc: OperatorOrder( $code: code, $opId: opId )
not Operator( id == $opId )

English
When there is an operator order but no matching operator...

[when]There is an (?i:operator order)=
      $order: OperatorOrder( $code: code, $opId: opId )     
[when]but no matching operator=
      not Operator( id == $opId )