Section 1. First consider quantities used by the domain model. Your domain code must express the "logic" of the business in its richest and often illogical detail. Every clause of every statement should be motivated by some business fact of life. Other concerns will be pushed into the specialized values of this section or pulled out into objects described later.
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Patterns
Whole Value as in date, money, or coordinate.
Exceptional Value as in various, unknown or failed.
Meaningless Behavior that could not be anticipated.
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