LRMer (IFLA Library Reference Model Entity Relationship)
http://iflastandards.info/ns/lrm/lrmer/E9A1
Nomens may be categorized in terms of: - the type of thing named (personal name, work title, etc.), - the source in which the nomen is attested (spine title, running title), - the function of the nomen (identifier, controlled access point, classification notation, etc.).