Reduced Arc - Mutually Exclusive Relationships

In some diagrams only one of the mutually exclusive relationships may be present, the other, being not applicable to the diagram, being omitted. For example, a particular diagram is concerned with WARDS and requires the inclusion of HOME LEAVE however, the second mutually exclusive relationship to ORGANISATION SITE is not germane to the diagram and can be left out. This omission is indicated by the straight line (arc) which normally spans the two relationships being displayed in a reduced manner.

An example of a reduced mutually exclusive relationship arc in diagrams is given below: