<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/Observation_with_pattern_and_element_constraints" />
  <name value="Observation_with_pattern_and_element_constraints" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.category">
      <path value="Observation.category" />
      <patternCodeableConcept>
        <coding>
          <system value="http://hl7.org/fhir/sid/icd-10" />
          <code value="45566" />
        </coding>
      </patternCodeableConcept>
    </element>
    <element id="Observation.category.coding.system">
      <path value="Observation.category.coding.system" />
      <min value="1" />
    </element>
    <element id="Observation.category.coding.code">
      <path value="Observation.category.coding.code" />
      <min value="1" />
    </element>
    <element id="Observation.category.coding.display">
      <path value="Observation.category.coding.display" />
      <min value="1" />
    </element>
  </differential>
</StructureDefinition>