Groups returned as posixGroup and groupOfUniqueNames

[thielj]

Hi,

can anyone shed some light why group objects returned with a search base ou=users,dc=example,dc=com come back as posixGroup, while searches with a base of ou=groups,dc=example,dc=com have an objectClass of groupOfUniqueNames?

# base <ou=groups,dc=example,dc=com> with scope subtree
# filter: (ou=admins)

dn: ou=admins,ou=groups,dc=example,dc=com
ou: admins
uid: admins
uniqueMember: cn=bob,ou=admins,ou=users,dc=example,dc=com
objectClass: groupOfUniqueNames
objectClass: top

# base <ou=users,dc=example,dc=com> with scope subtree
# filter: (ou=admins)

dn: ou=admins,ou=users,dc=example,dc=com
ou: admins
uid: admins
uniqueMember: cn=bob,ou=admins,ou=users,dc=example,dc=com
objectClass: posixGroup
objectClass: top

(most attributes removed for clarity)