An example to illustrate the core-defined extension which is used to indicate that a person requires an interpreter

Table View

Patient.id[0]UKCore-Extension-InterpreterRequired-Example
Patient.extension[0].url[0]http://hl7.org/fhir/StructureDefinition/patient-interpreterRequired
Patient.extension[0].value[0]True

XML View

<Patient xmlns="http://hl7.org/fhir">
    <id value="UKCore-Extension-InterpreterRequired-Example" />
    <!--   **************extension start**************   -->
    <extension url="http://hl7.org/fhir/StructureDefinition/patient-interpreterRequired">
        <valueBoolean value="true" />
    </extension>
    <!--   **************extension end**************   -->
</Patient>

JSON View

{
    "resourceType": "Patient",
    "id": "UKCore-Extension-InterpreterRequired-Example",
    "extension":  [
        {
            "url": "http://hl7.org/fhir/StructureDefinition/patient-interpreterRequired",
            "valueBoolean": true
        }
    ]
}