It appears possible to classify records ready for linkage according to both the kind of entity that the record represents and the kind of identifiers it contains. In the example of the last paragraph we intimated that one kind of linkage may depend on the success of another. In genealogy we are also concerned with a limited number of entity types. Here we most easily distinguish three basic levels: 1) event record linkage for documents, 2) individual record linkage for persons, 3) family record linkage for nuclear families uniting persons (and events) together in a single structure.
| 1-2.1 | Event linkage records. | ||
| 1-2.2 | Individual linkage records. | ||
| 1-2.3 | Family linkage records. | ||