categoriesForViewer

Answer a list of symbols representing the categories to offer in the viewer, in order

nameOfObjectRepresented

Answer the external name of the object represented

objectRepresented

Answer the object represented by the receiver

objectRepresented:

Set the receiver's representee. This clears out any preexisting state in the receiver

objectRepresented:labelString:

Set the receiver's representee as indicated, and use the given label to tag it