+ <ptr target="(AWOL)"/> requires that Persons be <ref target="foaf:Agent">Agents</ref> and have <ref target="awol:email">emails</ref>, but these requirements are not present in <ptr target="(RFC4287)"/> and this ontology does not recognize them.
+ With respect to agenthood, this ontology leaves the door open for <ref target="foaf:OnlineAccount">Online Account</ref> “Persons”, which are not necessarily Agents per·se.