<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="http://example.org/fhir/StructureDefinition/RobObservation" />
  <name value="RobObservation" />
  <status value="draft" />
  <date value="2017-09-14T18:33:29.868-07:00" />
  <fhirVersion value="3.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.extension">
      <path value="Observation.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <rules value="open" />
      </slicing>
    </element>
    <element id="Observation.extension:MyExtension">
      <path value="Observation.extension" />
      <sliceName value="MyExtension" />
      <type>
        <code value="Extension" />
        <profile value="http://example.org/fhir/StructureDefinition/PositionExtension" />
      </type>
    </element>
    <element id="Observation.extension:MyExtension.extension:x">
      <path value="Observation.extension.extension" />
      <sliceName value="x" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Observation.identifier">
      <path value="Observation.identifier" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="system" />
        </discriminator>
        <rules value="open" />
      </slicing>
    </element>
    <element id="Observation.identifier:ssn">
      <path value="Observation.identifier" />
      <sliceName value="ssn" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Observation.identifier:ssn.system">
      <path value="Observation.identifier.system" />
      <fixedUri value="http://example.org/fhir/somesystem" />
    </element>
    <element id="Observation.identifier:epicid">
      <path value="Observation.identifier" />
      <sliceName value="epicid" />
    </element>
    <element id="Observation.identifier:epicid.system">
      <path value="Observation.identifier.system" />
      <fixedUri value="http://example.org/fhir/somesystem2" />
    </element>
  </differential>
</StructureDefinition>