The eduPersonPrincipalName (ePPNePPN The eduPersonPrincipalName (ePPN) (format: <eid>@utexas.edu) is an attribute which is part of the eduPerson LDAP schema.) (format: <eid>@utexas.edu) is an attribute which is part of the eduPerson LDAPLDAP Lightweight Directory Access Protocol (LDAP) is a set of protocols for accessing information directories based on the standards contained within the X.500 standard, but is significantly simpler. schema.