In one example a method includes: selecting, by a computing device, a message description that indicates a pre-defined operator is associated with a message data field; receiving, by the computing device, information associated with the message data field; responsive to determining that the information indicates the message data field does not include data, determining, by the computing device, whether to include, in a second message that is associated with the message description, a data value for the message data field of the second message based on the pre-defined operator that is associated with the message data field, wherein the data value is stored by the computing device and is associated with the message data field.