<SearchParameter xmlns="http://hl7.org/fhir">
  <id value="Observation-based-on" />
  <url value="http://hl7.org/fhir/SearchParameter/Observation-based-on" />
  <name value="based-on" />
  <status value="draft" />
  <experimental value="false" />
  <publisher value="Health Level Seven International (Orders and Observations)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://hl7.org/fhir" />
    </telecom>
  </contact>
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://www.hl7.org/Special/committees/orders/index.cfm" />
    </telecom>
  </contact>
  <code value="based-on" />
  <base value="Observation" />
  <type value="reference" />
  <description value="Reference to the test or procedure request." />
  <expression value="Observation.basedOn" />
  <xpath value="f:Observation/f:basedOn" />
  <xpathUsage value="normal" />
  <target value="ReferralRequest" />
  <target value="CarePlan" />
  <target value="MedicationRequest" />
  <target value="NutritionOrder" />
  <target value="ProcedureRequest" />
  <target value="DeviceRequest" />
  <target value="ImmunizationRecommendation" />
</SearchParameter>