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The substance that causes the allergy or intolerance shall be specified in the <participant> structure.
The <code> element shall be present. It may contain a code and codeSystem attribute to indicate the code for the substance causing the allergy or intolerance. It shall contain a <reference> to the <originalText> in the narrative where the substance is named.
A specialized template should be defined for the <participant> structure describing the substance that causes the allergy or intolerance