Compounded Preparation - HC 1%, Salicylic Acid 5% in Glaxal Base - includes a reference to a substance in the ingredient element (id = "med0319")

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

<Medication xmlns="http://hl7.org/fhir">
  <id value="med0319"/> 
  <doseForm> 
    <coding> 
      <system value="http://snomed.info/sct"/> 
      <code value="385101003"/> 
      <display value="Ointment"/> 
    </coding> 
    <text value="Ointment"/> 
  </doseForm> 
  <ingredient> 
    <item> 
      <concept> 
        <coding> 
          <system value="http://snomed.info/sct"/> 
          <code value="387253001"/> 
          <display value="Salicylic Acid (substance)"/> 
        </coding> 
      </concept> 
    </item> 
    <strengthRatio> 
      <numerator> 
        <value value="5"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="g"/> 
      </numerator> 
      <denominator> 
        <value value="100"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="g"/> 
      </denominator> 
    </strengthRatio> 
  </ingredient> 
  <ingredient> 
    <item> 
      <concept> 
        <coding> 
          <system value="http://snomed.info/sct"/> 
          <code value="396458002"/> 
          <display value="Hydrocortisone (substance)"/> 
        </coding> 
      </concept> 
    </item> 
    <strengthRatio> 
      <numerator> 
        <value value="1"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="g"/> 
      </numerator> 
      <denominator> 
        <value value="100"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="g"/> 
      </denominator> 
    </strengthRatio> 
  </ingredient> 
  <ingredient> 
    <item> 
      <concept> 
        <coding> 
          <system value="http://snomed.info/sct"/> 
          <code value="126066007"/> 
          <display value="White petroleum (substance)"/> 
        </coding> 
      </concept> 
    </item> 
    <strengthRatio> 
      <numerator> 
        <value value="94"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="g"/> 
      </numerator> 
      <denominator> 
        <value value="100"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="g"/> 
      </denominator> 
    </strengthRatio> 
  </ingredient> 
</Medication>