Interval

Another kind of structure commonly needed in rich data is the interval. The definition of the Interval<T> class here is an intensional one, i.e. it states its members by implication from its limits, rather than enumerating them. To support the common need for defining times in models that could be either a fixed point in time or a time interval, the classes Point_interval<T> and Proper_interval<T> are provided. If Interval<X> is defined as the type of a feature in a class in an openEHR model, where X is some descendant of Ordered, then at runtime, either a Point_interval or Proper_interval may be attached.

In addition to the generic interval types, the derived types Multiplicity_interval and Cardinality are provided, for use in models to represent multiplicity, optionality, and cardinality.

The following UML diagram illustrates the interval package.

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