last changes for keep list

src/main/java/org/rosi_project/model_sync/model_join/representation/grammar/KeepSuperTypeExpression.java

@@ -102,16 +102,6 @@ public class KeepSuperTypeExpression extends CompoundKeepExpression {
     return target;
   }
 
-  /**
-   * Provides all {@code KeepExpression keep expressions} that should be used to build the Join for
-   * the instances of the superclass instances.
-   */
-  @Nonnull
-  @Override
-  public List<KeepExpression> getKeeps() {
-    return new ArrayList<>(keeps);
-  }
-
   @Override
   public void accept(@Nonnull KeepExpressionVisitor visitor) {
     visitor.visit(this);