<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://simplifier.net/health-espresso/is_custom_medication" />
  <name value="Is_custom_medication" />
  <status value="active" />
  <description value="A FHIR extension indicating whether a medication is custom, represented by a boolean value of true" />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="Condition" />
  </context>
  <context>
    <type value="element" />
    <expression value="Medication" />
  </context>
  <context>
    <type value="element" />
    <expression value="Immunization" />
  </context>
  <context>
    <type value="element" />
    <expression value="AllergyIntolerance.reaction" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="https://simplifier.net/health-espresso/is_custom_medication" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <type>
        <code value="boolean" />
      </type>
    </element>
  </differential>
</StructureDefinition>