This class is used to associate two (or more) Person records that refer to the same real-world person. This class is included for compatibility with FHIR, although we would expect that other attributes such as the date/time the association (or "link") was made, who made the link, and some explanatory text would necessary in real-world implementations. In addition, we would expect some kind of "unlink" action to be possible, and metadata about that action would also be recorded. "Link to a resource that concerns the same actual person." - HL7 FHIR, Person.link "Link to another patient resource that concerns the same actual patient." - HL7 FHIR, Patient.link