Constrain time ranges in CDA R3

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Submitted by: Keith Boone	Revision date: Kboone
Submitted date: Kboone	Change request ID: <<Change Request ID>>

Issue

HL7 Data types allow for time ranges to be specified by any two of low, high, center and width. There are six different combinations here. I have found only two of the six to be necessary: low and high, or width alone when a time range is known, but not it's anchors.

Rationale

The rationale for constaining this is that it dramatically simplifies how the information is stored without any loss in what is conveyed.

Resolution

(Resolution is to be recorded here and in the referenced minutes, which are the authoritative source of resolution).