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

      <id value="f204"/>
      <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="15970"/>
      </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="333346007"/>
                      <display value="Silver nitrate 20% solution (product)"/>
              </coding>
      </code>
      <description value="Solution for silver nitrate stain"/>
      <instance>
              <identifier>
                      <system value="http://acme.org/identifiers/substances/lot"/>
                      <value value="AB94687"/>
              </identifier>
              <expiry value="2018-01-01"/>
              <quantity>
                      <value value="100"/>
                      <unit value="mL"/>
                      <system value="http://unitsofmeasure.org"/>
                      <code value="mL"/>
              </quantity>
      </instance>

</Substance>