<SearchParameter xmlns="http://hl7.org/fhir">
  <id value="MedicationStatement-effective" />
  <url value="http://hl7.org/fhir/SearchParameter/MedicationStatement-effective" />
  <name value="effective" />
  <status value="draft" />
  <experimental value="false" />
  <publisher value="Health Level Seven International (Pharmacy)" />
  <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/medication/index.cfm" />
    </telecom>
  </contact>
  <code value="effective" />
  <base value="MedicationStatement" />
  <type value="date" />
  <description value="Date when patient was taking (or not taking) the medication" />
  <expression value="MedicationStatement.effective" />
  <xpath value="f:MedicationStatement/f:effectiveDateTime | f:MedicationStatement/f:effectivePeriod" />
  <xpathUsage value="normal" />
</SearchParameter>