Schema Examples
attributetype ( 0.9.2342.19200300.100.1.1
    NAME ( 'uid' 'userid' )
    DESC 'RFC1274: user identifier'
    EQUALITY caseIgnoreMatch
    SUBSTR caseIgnoreSubstringsMatch
    SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{256} )
objectclass ( 1.3.6.1.1.1.2.0 NAME 'posixAccount' SUP top
AUXILIARY
    DESC 'Abstraction of an account with POSIX attributes'
    MUST ( cn $ uid $ uidNumber $ gidNumber $ homeDirectory )
    MAY ( userPassword $ loginShell $ gecos $ description ) )