DeviceRequest.parameter 
Specific parameters for the ordered item. For example, the prism value for lenses.
= Must Support, = Is Modifier, = QiCore defined extension
| Field | Card. | Type | Description |
|---|---|---|---|
| code | 0..1 | Concept | A code or string that identifies the device detail being asserted. |
| value[x] | 0..1 | Concept | Quantity | Interval<Quantity> | Boolean | The value of the device detail. |