<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="custom-practitioner-profile" />
  <url value="http://example.org/fhir/StructureDefinition/custom-practitioner-profile" />
  <name value="CustomPractitionerProfile" />
  <status value="active" />
  <date value="2025-01-11" />
  <publisher value="Example Organization" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Practitioner" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Practitioner" />
  <derivation value="constraint" />
  <differential>
    <element id="Practitioner.name">
      <path value="Practitioner.name" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="HumanName" />
      </type>
    </element>
    <element id="Practitioner.telecom">
      <path value="Practitioner.telecom" />
      <min value="1" />
      <type>
        <code value="ContactPoint" />
      </type>
    </element>
    <element id="Practitioner.identifier">
      <path value="Practitioner.identifier" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="system" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <min value="2" />
      <max value="*" />
    </element>
    <element id="Practitioner.identifier:nationalID">
      <path value="Practitioner.identifier" />
      <sliceName value="nationalID" />
      <min value="1" />
      <patternIdentifier>
        <system value="http://example.org/national-id" />
        <value value="^[0-9]{14}$" />
      </patternIdentifier>
    </element>
    <element id="Practitioner.identifier:licenseNumber">
      <path value="Practitioner.identifier" />
      <sliceName value="licenseNumber" />
      <min value="1" />
      <patternIdentifier>
        <system value="http://example.org/medical-licenses" />
        <value value=".+" />
      </patternIdentifier>
    </element>
    <element id="Practitioner.practitionerRole">
      <path value="Practitioner.practitionerRole" />
      <min value="1" />
    </element>
    <element id="Practitioner.practitionerRole.organization">
      <path value="Practitioner.practitionerRole.organization" />
      <min value="1" />
      <type>
        <code value="Reference" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Organization" />
      </type>
    </element>
  </differential>
</StructureDefinition>