Proposed LDAP schema 
UID mapping
 See  idmap configuration and the accompanying ldap server setup instructions for details.
nfsv4.schema
------------
attributetype ( 1.3.6.1.4.1.250.1.61
        NAME ( 'NFSv4Name')
        DESC 'NFS version 4 Name'
        EQUALITY caseIgnoreIA5Match
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.26
        SINGLE-VALUE)
attributetype ( 1.3.6.1.4.1.250.1.62
        NAME ( 'GSSAuthName')
        DESC 'RPCSEC GSS authenticated user name'
        EQUALITY caseIgnoreIA5Match
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.26)
#
# minimal information for NFSv4 access. used when local filesystem
# access is not permitted (nsswitch ldap calls fail), or when
# inetorgPerson is too much info.
#
objectclass ( 1.3.6.1.4.1.250.1.60 NAME 'NFSv4RemotePerson'
        DESC 'NFS version4 person from remote NFSv4 Domain'
        SUP top STRUCTURAL
        MUST ( uidNumber $ gidNumber $ NFSv4Name )
        MAY ( cn $ GSSAuthName $ description) )
#
# minimal information for NFSv4 access. used when local filesystem
# access is not permitted (nsswitch ldap calls fail), or when
# inetorgPerson is too much info.
#
objectclass ( 1.3.6.1.4.1.250.1.63 NAME 'NFSv4RemoteGroup'
        DESC 'NFS version4 group from remote NFSv4 Domain'
        SUP top STRUCTURAL
        MUST ( gidNumber $ NFSv4Name )
        MAY ( cn $ memberUid $ description) )
fs_locations
 These have been  used for testing purposes.  In particular note the OIDs are temporary.  
Note that windows Active Directory has a 
schema
which includes similar information, but the critical data is hidden in the attribute
pkt.
attributetype ( 1.1.1
        NAME ( 'fslocations' )
        DESC 'replication list'
        EQUALITY caseExactMatch
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.44{32768} )
attributetype ( 1.1.3
        NAME ( 'referral' )
        DESC 'boolean determining if is a referral or replica'
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.7 )
objectclass ( 1.1.2
        NAME 'rnfs'
        DESC 'key - replication info'
        SUP top STRUCTURAL
        MUST ( cn $ fslocations $ referral ) )