code: public Datatype.Builder setPropertyEnum(TypeClass propertyEnum) {
      this.propertyEnum = Objects.requireNonNull(propertyEnum);
      _unsetProperties.remove(Property.PROPERTY_ENUM);
      return (Datatype.Builder) this;
    }
docs: Sets the value to be returned by {@link Datatype#getPropertyEnum()}.
  
  @return this {@code Builder} object
  @throws NullPointerException if {@code propertyEnum} is null