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/usr/share/sendmail/examples/ldap/sendmail.schema.v2 is in sendmail-base 8.15.2-3.

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The actual contents of the file can be viewed below.

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# Copyright (c) 2000-2002 Sendmail, Inc. and its suppliers.
#	All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
# $Id: sendmail.schema,v 8.21 2002/11/20 23:13:50 gshapiro Exp $

# Note that this schema is experimental at this point as it has had little
# public review.  Therefore, it may change in future versions.  Feedback
# via sendmail@sendmail.org is encouraged.

# OID arcs for Sendmail
# enterprise:		1.3.6.1.4.1
# sendmail:		enterprise.6152
# sendmail-at:		sendmail.3.1
# sendmail-oc:		sendmail.3.2

###########################################################################
#
# The Sendmail MTA attributes and objectclass
#
###########################################################################

# attribute sendmailMTACluster	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.10
	NAME 'sendmailMTACluster'
	DESC 'cluster name associated with a set of MTAs'
	EQUALITY caseIgnoreIA5Match
	SUBSTR caseIgnoreIA5SubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )

# attribute sendmailMTAHost	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.11
	NAME 'sendmailMTAHost'
	DESC 'host name associated with a MTA cluster'
	EQUALITY caseIgnoreIA5Match
	SUBSTR caseIgnoreIA5SubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )

#objectClass sendmailMTA
#	requires
#		objectClass
#	allows
#		sendmailMTACluster,
#		sendmailMTAHost,
#		Description

objectclass ( 1.3.6.1.4.1.6152.10.3.2.10
	NAME 'sendmailMTA'
	SUP top STRUCTURAL
	DESC 'Sendmail MTA definition'
	MAY ( sendmailMTACluster $ sendmailMTAHost $ Description ) )

###########################################################################
#
# The Sendmail MTA shared attributes
#
###########################################################################

# attribute sendmailMTAKey	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.13
	NAME 'sendmailMTAKey'
	DESC 'key (left hand side) of an aliases or map entry'
	EQUALITY caseIgnoreMatch
	SUBSTR caseIgnoreSubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{256} )

###########################################################################
#
# The Sendmail MTA Map attributes and objectclasses
#
###########################################################################

# attribute sendmailMTAMapName	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.14
	NAME 'sendmailMTAMapName'
	DESC 'identifier for the particular map'
	EQUALITY caseIgnoreMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{128} SINGLE-VALUE )

# attribute sendmailMTAMapValue	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.16
	NAME 'sendmailMTAMapValue'
	DESC 'value (right hand side) of a map entry'
	EQUALITY caseIgnoreMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )

# attribute sendmailMTAMapSearch cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.24
	NAME 'sendmailMTAMapSearch'
	DESC 'recursive search for values of a map entry'
	EQUALITY caseExactMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )

# attribute sendmailMTAMapURL cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.25
	NAME 'sendmailMTAMapURL'
	DESC 'recursive search URL for values of a map entry'
	EQUALITY caseExactMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )

#objectClass sendmailMTAMap
#	requires
#		objectClass,
#		sendmailMTAMapName,
#	allows
#		sendmailMTACluster,
#		sendmailMTAHost,
#		Description

objectclass ( 1.3.6.1.4.1.6152.10.3.2.11
	NAME 'sendmailMTAMap'
	SUP sendmailMTA STRUCTURAL
	DESC 'Sendmail MTA map definition'
	MUST sendmailMTAMapName
	MAY ( sendmailMTACluster $ sendmailMTAHost $ Description ) )

#objectClass sendmailMTAObject
#	requires
#		objectClass,
#		sendmailMTAMapName,
#		sendmailMTAKey,
#	allows
#		sendmailMTACluster,
#		sendmailMTAHost,
#		sendmailMTAMapValue,
#		sendmailMTAMapSearch,
#		sendmailMTAMapURL,
#		Description

objectclass ( 1.3.6.1.4.1.6152.10.3.2.12
	NAME 'sendmailMTAMapObject'
	SUP sendmailMTAMap STRUCTURAL
	DESC 'Sendmail MTA map object'
	MUST ( sendmailMTAMapName $ sendmailMTAKey )
	MAY ( sendmailMTACluster $ sendmailMTAHost $ 
		sendmailMTAMapValue $ sendmailMTAMapSearch $
		sendmailMTAMapURL $ Description ) )


###########################################################################
#
# The Sendmail MTA Alias attributes and objectclasses
#
###########################################################################

# attribute sendmailMTAAliasGrouping	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.18
	NAME 'sendmailMTAAliasGrouping'
	DESC 'name that identifies a particular aliases grouping'
	EQUALITY caseIgnoreIA5Match
	SUBSTR caseIgnoreIA5SubstringsMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )

# attribute sendmailMTAAliasValue	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.20
	NAME 'sendmailMTAAliasValue'
	DESC 'value (right hand side) of an alias'
	EQUALITY caseIgnoreMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )

# attribute sendmailMTAAliasSearch cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.26
	NAME 'sendmailMTAAliasSearch'
	DESC 'recursive search for values of an alias'
	EQUALITY caseExactMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )

# attribute sendmailMTAAliasURL cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.27
	NAME 'sendmailMTAAliasURL'
	DESC 'recursive search URL for values of an alias'
	EQUALITY caseExactMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )

#objectClass sendmailMTAAlias
#	requires
#		objectClass,
#	allows
#		sendmailMTAAliasGrouping,
#		sendmailMTACluster,
#		sendmailMTAHost,
#		Description

objectclass ( 1.3.6.1.4.1.6152.10.3.2.13
	NAME 'sendmailMTAAlias'
	SUP sendmailMTA STRUCTURAL
	DESC 'Sendmail MTA alias definition'
	MAY ( sendmailMTAAliasGrouping $
		sendmailMTACluster $ sendmailMTAHost $ Description ) )

#objectClass sendmailMTAAliasObject
#	requires
#		objectClass,
#		sendmailMTAKey,
#	allows
#		sendmailMTAAliasGrouping,
#		sendmailMTACluster,
#		sendmailMTAHost,
#		sendmailMTAAliasValue,
#		sendmailMTAAliasSearch,
#		sendmailMTAAliasURL,
#		Description

objectclass ( 1.3.6.1.4.1.6152.10.3.2.14
	NAME 'sendmailMTAAliasObject'
	SUP sendmailMTAAlias STRUCTURAL
	DESC 'Sendmail MTA alias object'
	MUST sendmailMTAKey
	MAY ( sendmailMTAAliasGrouping $ sendmailMTACluster $
		sendmailMTAHost $ sendmailMTAAliasValue $
		sendmailMTAAliasSearch $ sendmailMTAAliasURL $ Description ) )

###########################################################################
#
# The Sendmail MTA Class attributes and objectclass
#
###########################################################################

# attribute sendmailMTAClassName	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.22
	NAME 'sendmailMTAClassName'
	DESC 'identifier for the class'
	EQUALITY caseIgnoreMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{128} SINGLE-VALUE )

# attribute sendmailMTAClassValue	cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.23
	NAME 'sendmailMTAClassValue'
	DESC 'member of a class'
	EQUALITY caseIgnoreMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )

# attribute sendmailMTAClassSearch cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.28
	NAME 'sendmailMTAClassSearch'
	DESC 'recursive search for members of a class'
	EQUALITY caseExactMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )

# attribute sendmailMTAClassURL cis
attributetype ( 1.3.6.1.4.1.6152.10.3.1.29
	NAME 'sendmailMTAClassURL'
	DESC 'recursive search URL for members of a class'
	EQUALITY caseExactMatch
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )

#objectClass sendmailMTAClass
#	requires
#		objectClass,
#		sendmailMTAClassName,
#	allows
#		sendmailMTACluster,
#		sendmailMTAHost,
#		sendmailMTAClassValue,
#		sendmailMTAClassSearch,
#		sendmailMTAClassURL,
#		Description

objectclass ( 1.3.6.1.4.1.6152.10.3.2.15
	NAME 'sendmailMTAClass'
	SUP sendmailMTA STRUCTURAL
	DESC 'Sendmail MTA class definition'
	MUST sendmailMTAClassName
	MAY ( sendmailMTACluster $ sendmailMTAHost $
		sendmailMTAClassValue $ sendmailMTAClassSearch $
		sendmailMTAClassURL $ Description ) )