<StructureDefinition xmlns="http://hl7.org/fhir">
  <meta>
    <lastUpdated value="2019-03-12T19:10:50.5637971+00:00" />
  </meta>
  <url value="http://ehealthontario.ca/fhir/StructureDefinition/ca-on-lab-ext-obs-sort-key" />
  <name value="observation-sortKey" />
  <status value="draft" />
  <date value="2019-03-12T19:10:50.3766453+00:00" />
  <description value="Allows laboratories to suggest the sequence of test results within a single test request to simplify the display of the patient report by other external systems (e.g., a practitioner’s electronic medical record system)." />
  <purpose value="To allow laboratories to suggest the sequence of test results within a single test request" />
  <fhirVersion value="3.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="Observation" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <max value="1" />
      <mustSupport value="false" />
      <isModifier value="false" />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://ehealthontario.ca/fhir/StructureDefinition/ca-on-lab-ext-obs-sort-key" />
    </element>
    <element id="Extension.value[x]:valueString">
      <path value="Extension.valueString" />
      <sliceName value="valueString" />
      <min value="1" />
      <type>
        <code value="string" />
      </type>
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>