<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://bpcs.exchange/fhir/StructureDefinition/profile-Observation-document-base" />
  <name value="ObservationDocumentBase" />
  <status value="draft" />
  <fhirVersion value="5.0.0" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.extension:observationReceivedDate">
      <path value="Observation.extension" />
      <sliceName value="observationReceivedDate" />
      <type>
        <code value="Extension" />
        <profile value="https://bpcs.exchange/fhir/StructureDefinition/ext-Observation-ReceivedDate" />
      </type>
      <mustSupport value="true" />
    </element>
    <element id="Observation.category">
      <path value="Observation.category" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="$this" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <short value="This is a 'document'" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
    <element id="Observation.category:document">
      <path value="Observation.category" />
      <sliceName value="document" />
      <short value="This is a 'document'" />
      <min value="1" />
      <max value="1" />
      <patternCodeableConcept>
        <coding>
          <system value="https://bpcs.exchange/fhir/CodeSystem/cs-ObservationType" />
          <code value="document" />
        </coding>
      </patternCodeableConcept>
    </element>
    <element id="Observation.code">
      <path value="Observation.code" />
      <mustSupport value="true" />
      <binding>
        <strength value="required" />
        <valueSet value="https://bpcs.exchange/fhir/ValueSet/vs-DocumentType" />
      </binding>
    </element>
    <element id="Observation.code.extension">
      <path value="Observation.code.extension" />
      <mustSupport value="true" />
    </element>
    <element id="Observation.code.extension:documentNote">
      <path value="Observation.code.extension" />
      <sliceName value="documentNote" />
      <max value="1" />
      <type>
        <code value="Extension" />
        <profile value="https://bpcs.exchange/fhir/StructureDefinition/ext-Document-Note" />
      </type>
      <mustSupport value="true" />
      <isModifier value="false" />
    </element>
    <element id="Observation.focus">
      <path value="Observation.focus" />
      <type>
        <code value="Reference" />
        <profile value="https://bpcs.exchange/fhir/StructureDefinition/profile-Reference-rest" />
        <targetProfile value="https://bpcs.exchange/fhir/StructureDefinition/profile-Coverage-family" />
      </type>
      <mustSupport value="true" />
    </element>
    <element id="Observation.value[x]">
      <path value="Observation.value[x]" />
      <short value="Document Control Number" />
      <min value="1" />
      <type>
        <code value="string" />
      </type>
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>