<Observation xmlns="http://hl7.org/fhir">
    <id value="s4h-24h-average-heart-rate-example" />
    <meta>
        <profile value="http://fhir.smart4health.eu/StructureDefinition/s4h-observation-base" />
    </meta>
    <status value="final" />
    <category>
        <coding>
            <system value="http://terminology.hl7.org/CodeSystem/observation-category" />
            <code value="activity" />
        </coding>
        <text value="Activity" />
    </category>
    <code>
        <coding>
            <system value="http://loinc.org" />
            <code value="41924-2" />
            <display value="Heart rate 24 hour mean" />
        </coding>
        <text value="Heart rate 24 hour mean" />
    </code>
    <subject>
        <identifier>
            <system value="http://fhir.data4life.care/CodeSystem/user-id" />
            <value value="c7382336-e704-4c6b-a4e9-190a3695aa23" />
        </identifier>
    </subject>
    <effectiveDateTime value="2021-05-27" />
    <valueQuantity>
        <value value="70" />
        <unit value="beats per minute" />
        <system value="http://unitsofmeasure.org" />
        <code value="{beats}/min" />
    </valueQuantity>
    <device>
        <identifier>
            <system value="http://example.com/custom-device-id-namespace" />
            <value value="g639d0821535fd6553fa8764" />
        </identifier>
    </device>
</Observation>