<SearchParameter xmlns="http://hl7.org/fhir">
  <id value="Substance-code" />
  <url value="http://hl7.org/fhir/SearchParameter/Substance-code" />
  <name value="code" />
  <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="code" />
  <base value="Substance" />
  <type value="token" />
  <description value="The code of the substance or ingredient" />
  <expression value="Substance.code | Substance.ingredient.substance.as(CodeableConcept)" />
  <xpath value="f:Substance/f:code | f:Substance/f:ingredient/f:substanceCodeableConcept" />
  <xpathUsage value="normal" />
</SearchParameter>