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The mode can be 'Client', 'Server' or 'Both'. If set to 'Client' it executes the GELLO on the client. The other two options execute GELLO on the server and this leads to better persistence of created data if they are Observations (see later posts). The identifier needs to be in the shown format. The includesList is a list of codes - in this case, LOINC codes on an incoming Observation. So if any of those listed is present in OBX3 the GELLO will activate. The excludesList is usually used for a generated Observation with a unique code to prevent multiple firings of already persisted commenting.
