Properties
| Name | Required | Type | Description |
|---|---|---|---|
| id | No | string | Unique id for inter-element referencing |
| extension | No | Extension[] | Additional content defined by implementations |
| value | No | decimal | Numerical value (with implicit precision) |
| comparator | No | code | < / <= / >= / > - how to understand the value |
| unit | No | string | Unit representation |
| system | No | uri | System that defines coded unit form |
| code | No | code | Coded form of the unit |