<?xml version="1.0" encoding="UTF-8"?>

<Substance xmlns="http://hl7.org/fhir">
  <id value="f201"/>
  <code>
    <concept>
      <coding>
        <system value="http://snomed.info/sct"/>
        <code value="406466009"/>
        <display value="House dust allergen"/>
      </coding>
    </concept>
  </code>
</Substance>