<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="http://example.com/fhir/StructureDefinition/patient-1a-extensions" />
  <version value="0.1" />
  <name value="PatientWithExtensions" />
  <title value="Patient Profile 1 - 1a Extensions" />
  <status value="active" />
  <experimental value="false" />
  <date value="2019" />
  <publisher value="Chris Grenz" />
  <contact>
    <telecom>
      <system value="email" />
      <value value="chris.grenz@thoughtworks.com" />
    </telecom>
  </contact>
  <description value="Profile of Patient with extensions" />
  <copyright value="(c)2019 Chris Grenz into public domain" />
  <fhirVersion value="4.0.0" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Patient" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Patient" />
  <derivation value="constraint" />
  <differential>
    <element id="Patient">
      <path value="Patient" />
    </element>
    <element id="Patient.extension">
      <path value="Patient.extension" />
    </element>
    <element id="Patient.extension:doNotCall">
      <path value="Patient.extension" />
      <sliceName value="doNotCall" />
      <type>
        <code value="Extension" />
        <profile value="http://example.com/fhir/StructureDefinition/patient-donotcall" />
      </type>
    </element>
    <element id="Patient.extension:legalCase">
      <path value="Patient.extension" />
      <sliceName value="legalCase" />
      <type>
        <code value="Extension" />
        <profile value="http://example.com/fhir/StructureDefinition/patient-legalcase" />
      </type>
    </element>
    <element id="Patient.extension:legalCase.value[x]:valueBoolean.extension:leadCounsel">
      <path value="Patient.extension.valueBoolean.extension" />
      <sliceName value="leadCounsel" />
      <type>
        <code value="Extension" />
        <profile value="http://example.com/fhir/StructureDefinition/patient-legalcase-leadcounsel" />
      </type>
    </element>
  </differential>
</StructureDefinition>