Properties
| Name | Required | Type | Description |
|---|---|---|---|
| id | No | string | Unique id for inter-element referencing |
| extension | No | Extension[] | Additional content defined by implementations |
| system | No | code | phone / fax / email / pager / url / sms / other |
| value | No | string | The actual contact point details |
| use | No | code | home / work / temp / old / mobile - purpose of this contact point |
| rank | No | positiveInt | Specify preferred order of use (1 = highest) |
| period | No | Period | Time period when the contact point was/is in use |