An example to illustrate the use of an address key used with the address datatype

Table View

Patient.id[0]UKCore-Extension-AddressKey-Example
Patient.address[0].extension[0].extension[0].url[0]type
Patient.address[0].extension[0].extension[0].value[0].system[0]https://fhir.hl7.org.uk/CodeSystem/UKCore-AddressKeyType
Patient.address[0].extension[0].extension[0].value[0].code[0]PAF
Patient.address[0].extension[0].extension[0].value[0].display[0]Postcode Address File
Patient.address[0].extension[0].extension[1].url[0]value
Patient.address[0].extension[0].extension[1].value[0]LS10ABC
Patient.address[0].extension[0].url[0]https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-AddressKey
Patient.address[0].line[0]4 Sandmoor Drive
Patient.address[0].city[0]LEEDS
Patient.address[0].postalCode[0]LS17 7DF

XML View

<Patient xmlns="http://hl7.org/fhir">
    <id value="UKCore-Extension-AddressKey-Example" />
    <address>
        <!--  **************extension start**************  -->
        <extension url="https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-AddressKey">
            <extension url="type">
                <valueCoding>
                    <system value="https://fhir.hl7.org.uk/CodeSystem/UKCore-AddressKeyType" />
                    <code value="PAF" />
                    <display value="Postcode Address File" />
                </valueCoding>
            </extension>
            <extension url="value">
                <valueString value="LS10ABC" />
            </extension>
        </extension>
        <line value="4 Sandmoor Drive" />
        <city value="LEEDS" />
        <postalCode value="LS17 7DF" />
        <!--  *************extension end ***************** -->
    </address>
</Patient>

JSON View

{
    "resourceType": "Patient",
    "id": "UKCore-Extension-AddressKey-Example",
    "address":  [
        {
            "extension":  [
                {
                    "url": "https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-AddressKey",
                    "extension":  [
                        {
                            "url": "type",
                            "valueCoding": {
                                "system": "https://fhir.hl7.org.uk/CodeSystem/UKCore-AddressKeyType",
                                "code": "PAF",
                                "display": "Postcode Address File"
                            }
                        },
                        {
                            "url": "value",
                            "valueString": "LS10ABC"
                        }
                    ]
                }
            ],
            "line":  [
                "4 Sandmoor Drive"
            ],
            "city": "LEEDS",
            "postalCode": "LS17 7DF"
        }
    ]
}