<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/MyChargeItem" />
  <name value="MyChargeItem" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="ChargeItem" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/ChargeItem" />
  <derivation value="constraint" />
  <differential>
    <element id="ChargeItem.code.coding">
      <path value="ChargeItem.code.coding" />
      <slicing>
        <discriminator>
          <type value="pattern" />
          <path value="$this" />
        </discriminator>
        <rules value="closed" />
      </slicing>
      <min value="2" />
      <max value="3" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>