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/etc/ldap/schema/nis.schema is in slapd 2.4.28-1.1ubuntu4.6.

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The actual contents of the file can be viewed below.

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# $OpenLDAP$
## This work is part of OpenLDAP Software <http://www.openldap.org/>.
##
## Copyright 1998-2011 The OpenLDAP Foundation.
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted only as authorized by the OpenLDAP
## Public License.
##
## A copy of this license is available in the file LICENSE in the
## top-level directory of the distribution or, alternatively, at
## <http://www.OpenLDAP.org/license.html>.

# Definitions from RFC2307 (Experimental)
#	An Approach for Using LDAP as a Network Information Service

# Depends upon core.schema and cosine.schema

# Note: The definitions in RFC2307 are given in syntaxes closely related
# to those in RFC2252, however, some liberties are taken that are not
# supported by RFC2252.  This file has been written following RFC2252
# strictly.

# OID Base is iso(1) org(3) dod(6) internet(1) directory(1) nisSchema(1).
# i.e. nisSchema in RFC2307 is 1.3.6.1.1.1
#
# Syntaxes are under 1.3.6.1.1.1.0 (two new syntaxes are defined)
#	validaters for these syntaxes are incomplete, they only
#	implement printable string validation (which is good as the
#	common use of these syntaxes violates the specification).
# Attribute types are under 1.3.6.1.1.1.1
# Object classes are under 1.3.6.1.1.1.2

# Attribute Type Definitions

# builtin
#attributetype ( 1.3.6.1.1.1.1.0 NAME 'uidNumber'
#	DESC 'An integer uniquely identifying a user in an administrative domain'
#	EQUALITY integerMatch
#	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

# builtin
#attributetype ( 1.3.6.1.1.1.1.1 NAME 'gidNumber'
#	DESC 'An integer uniquely identifying a group in an administrative domain'
#	EQUALITY integerMatch
#	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.2 NAME 'gecos'
	DESC 'The GECOS field; the common name'
	EQUALITY caseIgnoreIA5Match
	SUBSTR caseIgnoreIA5SubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.3 NAME 'homeDirectory'
	DESC 'The absolute path to the home directory'
	EQUALITY caseExactIA5Match
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.4 NAME 'loginShell'
	DESC 'The path to the login shell'
	EQUALITY caseExactIA5Match
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.5 NAME 'shadowLastChange'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.6 NAME 'shadowMin'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.7 NAME 'shadowMax'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.8 NAME 'shadowWarning'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.9 NAME 'shadowInactive'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.10 NAME 'shadowExpire'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.11 NAME 'shadowFlag'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.12 NAME 'memberUid'
	EQUALITY caseExactIA5Match
	SUBSTR caseExactIA5SubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )

attributetype ( 1.3.6.1.1.1.1.13 NAME 'memberNisNetgroup'
	EQUALITY caseExactIA5Match
	SUBSTR caseExactIA5SubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )

attributetype ( 1.3.6.1.1.1.1.14 NAME 'nisNetgroupTriple'
	DESC 'Netgroup triple'
	SYNTAX 1.3.6.1.1.1.0.0 )

attributetype ( 1.3.6.1.1.1.1.15 NAME 'ipServicePort'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.16 NAME 'ipServiceProtocol'
	SUP name )

attributetype ( 1.3.6.1.1.1.1.17 NAME 'ipProtocolNumber'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.18 NAME 'oncRpcNumber'
	EQUALITY integerMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.19 NAME 'ipHostNumber'
	DESC 'IP address'
	EQUALITY caseIgnoreIA5Match
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{128} )

attributetype ( 1.3.6.1.1.1.1.20 NAME 'ipNetworkNumber'
	DESC 'IP network'
	EQUALITY caseIgnoreIA5Match
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{128} SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.21 NAME 'ipNetmaskNumber'
	DESC 'IP netmask'
	EQUALITY caseIgnoreIA5Match
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{128} SINGLE-VALUE )

attributetype ( 1.3.6.1.1.1.1.22 NAME 'macAddress'
	DESC 'MAC address'
	EQUALITY caseIgnoreIA5Match
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{128} )

attributetype ( 1.3.6.1.1.1.1.23 NAME 'bootParameter'
	DESC 'rpc.bootparamd parameter'
	SYNTAX 1.3.6.1.1.1.0.1 )

attributetype ( 1.3.6.1.1.1.1.24 NAME 'bootFile'
	DESC 'Boot image name'
	EQUALITY caseExactIA5Match
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )

attributetype ( 1.3.6.1.1.1.1.26 NAME 'nisMapName'
	SUP name )

attributetype ( 1.3.6.1.1.1.1.27 NAME 'nisMapEntry'
	EQUALITY caseExactIA5Match
	SUBSTR caseExactIA5SubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{1024} SINGLE-VALUE )

# Object Class Definitions

objectclass ( 1.3.6.1.1.1.2.0 NAME 'posixAccount'
	DESC 'Abstraction of an account with POSIX attributes'
	SUP top AUXILIARY
	MUST ( cn $ uid $ uidNumber $ gidNumber $ homeDirectory )
	MAY ( userPassword $ loginShell $ gecos $ description ) )

objectclass ( 1.3.6.1.1.1.2.1 NAME 'shadowAccount'
	DESC 'Additional attributes for shadow passwords'
	SUP top AUXILIARY
	MUST uid
	MAY ( userPassword $ shadowLastChange $ shadowMin $
	      shadowMax $ shadowWarning $ shadowInactive $
	      shadowExpire $ shadowFlag $ description ) )

objectclass ( 1.3.6.1.1.1.2.2 NAME 'posixGroup'
	DESC 'Abstraction of a group of accounts'
	SUP top STRUCTURAL
	MUST ( cn $ gidNumber )
	MAY ( userPassword $ memberUid $ description ) )

objectclass ( 1.3.6.1.1.1.2.3 NAME 'ipService'
	DESC 'Abstraction an Internet Protocol service'
	SUP top STRUCTURAL
	MUST ( cn $ ipServicePort $ ipServiceProtocol )
	MAY ( description ) )

objectclass ( 1.3.6.1.1.1.2.4 NAME 'ipProtocol'
	DESC 'Abstraction of an IP protocol'
	SUP top STRUCTURAL
	MUST ( cn $ ipProtocolNumber $ description )
	MAY description )

objectclass ( 1.3.6.1.1.1.2.5 NAME 'oncRpc'
	DESC 'Abstraction of an ONC/RPC binding'
	SUP top STRUCTURAL
	MUST ( cn $ oncRpcNumber $ description )
	MAY description )

objectclass ( 1.3.6.1.1.1.2.6 NAME 'ipHost'
	DESC 'Abstraction of a host, an IP device'
	SUP top AUXILIARY
	MUST ( cn $ ipHostNumber )
	MAY ( l $ description $ manager ) )

objectclass ( 1.3.6.1.1.1.2.7 NAME 'ipNetwork'
	DESC 'Abstraction of an IP network'
	SUP top STRUCTURAL
	MUST ( cn $ ipNetworkNumber )
	MAY ( ipNetmaskNumber $ l $ description $ manager ) )

objectclass ( 1.3.6.1.1.1.2.8 NAME 'nisNetgroup'
	DESC 'Abstraction of a netgroup'
	SUP top STRUCTURAL
	MUST cn
	MAY ( nisNetgroupTriple $ memberNisNetgroup $ description ) )

objectclass ( 1.3.6.1.1.1.2.9 NAME 'nisMap'
	DESC 'A generic abstraction of a NIS map'
	SUP top STRUCTURAL
	MUST nisMapName
	MAY description )

objectclass ( 1.3.6.1.1.1.2.10 NAME 'nisObject'
	DESC 'An entry in a NIS map'
	SUP top STRUCTURAL
	MUST ( cn $ nisMapEntry $ nisMapName )
	MAY description )

objectclass ( 1.3.6.1.1.1.2.11 NAME 'ieee802Device'
	DESC 'A device with a MAC address'
	SUP top AUXILIARY
	MAY macAddress )

objectclass ( 1.3.6.1.1.1.2.12 NAME 'bootableDevice'
	DESC 'A device with boot parameters'
	SUP top AUXILIARY
	MAY ( bootFile $ bootParameter ) )