Patient Observation: Domain Model
Figure 11-1 shows the initial domain model for our system.
How do these concepts represent the information in the domain?
Figure 11-1. Patient Observation Domain Model
I'll start with the simple concepts of Quantity, Unit, and Range. Quantity represents a dimensioned value, such as 6 feet—a quantity with amount of 6 and unit of feet. Units are simply those categories of measurement with which we want to deal. Range allows us to talk about ranges as a single concept—for instance, a range of 4 feet to 6 feet is represented as a single Range object with an upper bound of 6 feet and a lower bound of 4 feet. ...
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