<StructureDefinition xmlns="http://hl7.org/fhir">
  <meta>
    <lastUpdated value="2022-01-29T10:46:53.708+00:00" />
  </meta>
  <url value="https://example.org/fhir/StructureDefinition/bodyweight" />
  <name value="ObsverationBodyweight" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.code.coding.system">
      <path value="Observation.code.coding.system" />
      <min value="1" />
      <fixedUri value="http://snomed.info/sct" />
    </element>
    <element id="Observation.code.coding.code">
      <path value="Observation.code.coding.code" />
      <min value="1" />
      <fixedCode value="27113001" />
    </element>
    <element id="Observation.subject">
      <path value="Observation.subject" />
      <type>
        <code value="Reference" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Group" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Device" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Location" />
        <targetProfile value="https://example.org/fhir/StructureDefinition/PATIENTHPI" />
      </type>
    </element>
    <element id="Observation.value[x]">
      <path value="Observation.value[x]" />
      <min value="1" />
      <type>
        <code value="Quantity" />
      </type>
    </element>
    <element id="Observation.value[x].unit">
      <path value="Observation.value[x].unit" />
      <fixedString value="kilogram" />
    </element>
    <element id="Observation.value[x].system">
      <path value="Observation.value[x].system" />
      <fixedUri value="http://ucum.org" />
    </element>
    <element id="Observation.value[x].code">
      <path value="Observation.value[x].code" />
      <fixedCode value="kg" />
    </element>
    <element id="Observation.bodySite">
      <path value="Observation.bodySite" />
      <max value="0" />
    </element>
    <element id="Observation.specimen">
      <path value="Observation.specimen" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>