urlCodeSystem URL. The server must know the code system (e.g. it is defined explicitly in the server'scode systems, or it is known implicitly by the serveruri/0..1
codeThe code that is to be validatedcode/0..1
displayThe display associated with the code, if provided. If a display is provided a code must be provided. If no display is provided, the server cannot validate the display value, but may choose to return a recommended display name in an extension in the outcome. Whether displays are case sensitive is code system dependentstring/0..1
+Parameter