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Fact Oriented Modeling with FCO-IM: Capturing Business Semantics in Data Models with Fully Communication Oriented Information Modeling by Stijn Hoppenbrouwers, Marco Engelbart, Jan Pieter Zwart

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A2.4 Subtypes

Subtypes ‘Approved Reservation Request Part’ and ‘Ticket for Reservation’

BR 29 Tickets for a reservation request part can only be issued for an approved reservation request part.

Clearly, an approved reservation request part is a special kind of reservation request part. The Business Rule states that tickets can only be issued for such approved parts. The status of a reservation request part tells us which parts are approved, which is in a Fact Type played by the Supertype, so a Derivation Rule can be made that satisfies the requirement in Textbox 6.16. Because of BR 28 (see Section A3.2 below) the condition contains the three statuses ‘approved’, ‘assigned’ and ‘completed’. The tickets will still be for the same approved reservation ...

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