Subject: Schema about attribute
Author: eLDAP
Posted on: 01/31/2014 08:32:14 PM
The attribute types are described by values for the subschema "attributeTypes" attribute, which is written in the AttributeTypeDescription syntax:
AttributeTypeDescription = "(" whsp
numericoid whsp ; AttributeType identifier
[ "NAME" qdescrs ] ; name used in AttributeType
[ "DESC" qdstring ] ; description
[ "OBSOLETE" whsp ]
[ "SUP" woid ] ; derived from this other
; AttributeType
[ "EQUALITY" woid ; Matching Rule name
[ "ORDERING" woid ; Matching Rule name
[ "SUBSTR" woid ] ; Matching Rule name
[ "SYNTAX" whsp noidlen whsp ] ; see section 4.3
[ "SINGLE-VALUE" whsp ] ; default multi-valued
[ "COLLECTIVE" whsp ] ; default not collective
[ "NO-USER-MODIFICATION" whsp ]; default user modifiable
[ "USAGE" whsp AttributeUsage ]; default userApplications
whsp ")"
AttributeUsage =
"userApplications" /
"directoryOperation" /
"distributedOperation" / ; DSA-shared
"dSAOperation" ; DSA-specific, value depends on server
For example, the schema about standard operational attribute 'modifyTimestamp' is defined as:
( 2.5.18.2 NAME 'modifyTimestamp' EQUALITY generalizedTimeMatch
ORDERING generalizedTimeOrderingMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.24
SINGLE-VALUE NO-USER-MODIFICATION USAGE directoryOperation )
What it tells:
directoryOperation -- this is operational attribute (it may or not be altered by user)
SINGLE-VALUE -- multiple value is not allowed for this attribute
NO-USER-MODIFICATION -- user is not allowed to alter this attribute
References:
