<?xml version=“1.0” encoding=“UTF-8”?> <Substance xmlns=“hl7.org/fhir”>

      <id value="f203"/>
      <meta>
  <security>
    <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/>
    <code value="HTEST"/>
    <display value="test health data"/>
  </security>
</meta>
<identifier>
              <system value="http://acme.org/identifiers/substances"/>
              <value value="1234"/>
      </identifier>
      <category><coding>
                      <system value="http://terminology.hl7.org/CodeSystem/substance-category"/>
                      <code value="chemical"/>
                      <display value="Chemical"/>
              </coding></category>
      <code>
              <coding>
                      <system value="http://snomed.info/sct"/>
                      <code value="88480006"/>
                      <display value="Potassium"/>
              </coding>
      </code>

</Substance>