When reconciling our data against authority files, often there are two entities described in the authority file. One represents the concept, and the other the entity.
For example, ULAN has
ulan:500012368, which represents the ontology entry for Mary Cassatt, but they also have
ulan:500012368-agent, which represents Mary Cassatt herself.
When we are reconciling the Actors or other entities represented in our data, which of these entities should I link to?
When linking to an external URI that provides both a Concept and a Real World Object, you should link to the Real World Object. Additionally, it is a good practive to use http://lexvo.org/ontology#isFocusOf to link to the Concept, much like you would link to the
skos:inScheme, to provide additional context for users.
(delete rant about ULAN modeling) I suggest http://lexvo.org/ontology#isFocusOf (inverse of foaf:focus) And I have suggested (several times) that this should be in ULAN and TGN natively.
The best is to use the ulan:nnnn-agent URL directly. You could make statements about it (e.g. names coming from local data) in your repository. Of course, if you want to analyze which data about agents came from which institution, then you need own URLs, and can connect them with sameAs.