<Substance xmlns="http://hl7.org/fhir"><id value="example"/><identifier><system value="http://acme.org/identifiers/substances"/><value value="1463"/></identifier><status value="active"/><category><coding><system value="http://terminology.hl7.org/CodeSystem/substance-category"/><code value="allergen"/><display value="Allergen"/></coding></category><code><concept><text value="apitoxin (Honey Bee Venom)"/></concept></code></Substance>