As we said yesterday... our EMPI can receive data from multiple sources, REST, HL7 messaging, etc. But it is possible that the standard fields are not enough and we want to expand the patient information to help discriminate and uniquely identify them. How could we customize patient data? Modifying the standard classes to our liking? NOOOOO!!!! Well, a little yes, but not like crazy, because if we modify standard classes carelessly we may find that in a future update we lose all these modifications.