@Target(value=ANNOTATION_TYPE) @Retention(value=RUNTIME) public @interface ConditionalPostconditionAnnotation
EnsuresQualifierIf. The annotation that is annotated
 as ConditionalPostconditionAnnotation must have a value called expression that is
 an array of Strings of the same format and with the same meaning as the value expression in EnsuresQualifierIf, as well as a value result with the same
 meaning as the value result in EnsuresQualifierIf.
 The value qualifier that is necessary for a conditional postcondition specified with
 EnsuresQualifier is hard-coded here with the value qualifier.
EnsuresQualifier| Modifier and Type | Required Element and Description | 
|---|---|
| Class<? extends Annotation> | qualifierThe hard-coded qualifier for the postcondition. | 
public abstract Class<? extends Annotation> qualifier