1) If code is present, displayName MAY also be present, so that knowledge resources that do not support a given code system MAY still process the request using displayName as a search keyword.
2) If code is present, codeSystem SHALL be present.
3) If the code, the displayName, and originalText are all present, knowledge resources MAY decide whether to process the code, the displayName, and/or the originalText to retrieve relevant content.
4) If code is not present, the text displayed to (or entered by) the user SHALL be represented in the originalText attribute.
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