An Agent who “owns” or controlls this Online Account.

defines this property as an inverse of , but also defines its domain as User Accounts. Assuming there exist Online Accounts which are not User Accounts, one or the other of these statements must be in error. Following the general principle of relaxing requirements when they serve no obvious purpose, this ontology keeps the inverse relationship and broadens the domain.

This property is functional; to indicate that an Online Account is controlled by multiple Agents, one must indicate a Group.