<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/AadharIndExtension" />
  <name value="AadharIndExtension" />
  <status value="draft" />
  <fhirVersion value="5.0.0" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="Patient.identifier" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Aadhar Number" />
      <definition value="Aadhaar Number" />
      <comment value="Provide the 12 digit Aadhaar Number" />
      <max value="1" />
    </element>
    <element id="Extension.extension:elem">
      <path value="Extension.extension" />
      <sliceName value="elem" />
    </element>
    <element id="Extension.extension:elem.extension">
      <path value="Extension.extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.extension:elem.url">
      <path value="Extension.extension.url" />
      <fixedUri value="elem" />
    </element>
    <element id="Extension.extension:elem.value[x]">
      <path value="Extension.extension.value[x]" />
      <type>
        <code value="string" />
      </type>
      <meaningWhenMissing value="Provide Aadhar Number" />
      <patternString value="^\d{12}$" />
      <maxLength value="12" />
      <binding>
        <strength value="required" />
        <description value="Mandate Provide the 12 digit Aadhar Number" />
      </binding>
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="https://example.org/fhir/StructureDefinition/AadharIndExtension" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>