{
    "resourceType": "StructureDefinition",
    "id": "Laterality",
    "url": "http://example.org/StructureDefinition/Laterality",
    "name": "Laterality",
    "status": "active",
    "description": "Body side of a body location.",
    "fhirVersion": "4.0.1",
    "mapping":  [
        {
            "identity": "rim",
            "uri": "http://hl7.org/v3",
            "name": "RIM Mapping"
        }
    ],
    "kind": "complex-type",
    "abstract": false,
    "context":  [
        {
            "type": "element",
            "expression": "Element"
        }
    ],
    "type": "Extension",
    "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
    "derivation": "constraint",
    "differential": {
        "element":  [
            {
                "id": "Extension",
                "path": "Extension",
                "definition": "Body side of a body location."
            },
            {
                "id": "Extension.extension",
                "path": "Extension.extension",
                "max": "0"
            },
            {
                "id": "Extension.url",
                "path": "Extension.url",
                "fixedUri": "http://example.org/StructureDefinition/Laterality"
            },
            {
                "id": "Extension.value[x]",
                "path": "Extension.value[x]",
                "type":  [
                    {
                        "code": "CodeableConcept"
                    }
                ],
                "binding": {
                    "strength": "required",
                    "valueSet": "http://hl7.org/fhir/ValueSet/bodysite-laterality"
                }
            }
        ]
    }
}

<StructureDefinition xmlns="http://hl7.org/fhir">
    <id value="Laterality" />
    <url value="http://example.org/StructureDefinition/Laterality" />
    <name value="Laterality" />
    <status value="active" />
    <description value="Body side of a body location." />
    <fhirVersion value="4.0.1" />
    <mapping>
        <identity value="rim" />
        <uri value="http://hl7.org/v3" />
        <name value="RIM Mapping" />
    </mapping>
    <kind value="complex-type" />
    <abstract value="false" />
    <context>
        <type value="element" />
        <expression value="Element" />
    </context>
    <type value="Extension" />
    <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
    <derivation value="constraint" />
    <differential>
        <element id="Extension">
            <path value="Extension" />
            <definition value="Body side of a body location." />
        </element>
        <element id="Extension.extension">
            <path value="Extension.extension" />
            <max value="0" />
        </element>
        <element id="Extension.url">
            <path value="Extension.url" />
            <fixedUri value="http://example.org/StructureDefinition/Laterality" />
        </element>
        <element id="Extension.value[x]">
            <path value="Extension.value[x]" />
            <type>
                <code value="CodeableConcept" />
            </type>
            <binding>
                <strength value="required" />
                <valueSet value="http://hl7.org/fhir/ValueSet/bodysite-laterality" />
            </binding>
        </element>
    </differential>
</StructureDefinition>