<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/MyPatient" />
  <name value="MyPatient" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Patient" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Patient" />
  <derivation value="constraint" />
  <differential>
    <element id="Patient.extension">
      <path value="Patient.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <min value="0" />
    </element>
    <element id="Patient.extension:myExtension">
      <path value="Patient.extension" />
      <sliceName value="myExtension" />
      <min value="0" />
      <type>
        <code value="Extension" />
        <profile value="http://hl7.org/fhir/us/core/StructureDefinition/us-core-race" />
      </type>
    </element>
    <element id="Patient.name">
      <path value="Patient.name" />
      <min value="1" />
      <max value="1" />
    </element>
  </differential>
</StructureDefinition>