Author attributes denote arKItect users. It is possible to set a default value: in this case, arKItect users having access to the active workspace are displayed in a drop-down list along with the entry Creator. The Creator sets the user that has created the object as its default attributes value.
When no default value is set, nothing is displayed in the Internal Block Diagram. The creator is only set as default value for newly created objects; for previously existing ones, the text Creator is displayed for the lack of other information.