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| [[Transaction script pattern]] || Organizes business logic by procedures where each procedure handles a | [[Domain model pattern]] || An object model of the domain that incorporates both behavior and data

*Sequences and bags are both subtypes of a collection supertype. This provides some integration and interoperability between them: there ...having BagSingles and BagPairs types. I had assumed that there would be a supertype Bag but when I thought about the contract that that could offer, I decided

...s that a new variant can be added without necessarily having to modify the supertype (but will require modifying the enum). **I wondered briefly about using the [[State]] pattern, but it is unsuitable (I explicitly did not want the fancy type-switch that