Existing Wording: Comments

This is not a duration - that's a measure of time (a separate type), but a duration that occurs at a fixed value of time. A Period specifies a range of time; the context of use will specify whether the entire range applies (e.g. "the patient was an inpatient of the hospital for this time range") or one value from the range applies (e.g. "give to the patient between these two times"). If duration is required, specify the type as Interval|Duration.

Proposed Wording: Comments

Period specifies a range of times. The context will specify whether the entire range applies (e.g. "the patient was an inpatient of the hospital for this time range") or one value from the range applies (e.g. "give to the patient between these two times").

Period is not use for a duration (a measure of elapsed time). See Duration and Interval for representing durations.

Comment:

The comment switches between discussion of duration, period, and duration. Separate into two paragraphs, one contrasting with, and providing the reference to Duration; the other giving the definition and examples of period

Summary:

Clarify distinction between Period and Duration