<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-Observation-COVID19" />
  <name value="NHSDigitalObservationCOVID19" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-Observation" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.category:COVID-TestPillar">
      <path value="Observation.category" />
      <sliceName value="COVID-TestPillar" />
      <min value="1" />
    </element>
    <element id="Observation.code.coding:snomedCT">
      <path value="Observation.code.coding" />
      <sliceName value="snomedCT" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Observation.subject.identifier">
      <path value="Observation.subject.identifier" />
      <min value="1" />
    </element>
  </differential>
</StructureDefinition>