Calendar Server
cis, single-valued
icsCalendarResource, icsCalendarUser, inetResource
For users, full name of person. For resources, a unique identifier. In either case, it may contain spaces and special characters. Abbreviation for commonName.
For a user: cn: John Doe.
For a resource: cn: Conference Room #3
or
commonName: John Doe
commonName: Conference Room #3
2.5.4.3