Representing Tables and Subtrees in the X.500 Directory
RFC 2293

Document Type RFC - Proposed Standard (March 1998; No errata)
Obsoletes RFC 1837
Author Steve Kille 
Last updated 2013-03-02
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Network Working Group                                            S. Kille
Request for Comments: 2293                                     Isode Ltd.
Obsoletes: 1837                                                March 1998
Category: Standards Track

        Representing Tables and Subtrees in the X.500 Directory

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.


   This document defines techniques for representing two types of
   information mapping in the OSI Directory [1].

   1.  Mapping from a key to a value (or set of values), as might
       be done in a table lookup.

   2.  Mapping from a distinguished name to an associated
       value (or values), where the values are not defined by the owner
       of the entry.  This is achieved by use of a directory subtree.

   These techniques were developed for supporting MHS use of Directory
   [2], but are specified separately as they have more general

Kille                       Standards Track                     [Page 1]
RFC 2293            Table and Subtrees in the X.500           March 1998

1  Representing Flat Tables

   Before considering specific function, a general purpose technique for
   representing tables in the directory is introduced.  The schema for
   this is given in Figure 1.  A table can be considered as an unordered
   set of key to (single or multiple) value mappings, where the key
   cannot be represented as a global name.  There are four reasons why
   this may occur:

   1.  The object does not have a natural global name.

   2.  The object can only be named effectively in the context of
       being a key to a binding.  In this case, the object will be given
       a natural global name by the table.

   3.  The object has a global name, and the table is being used
       to associate parameters with this object, in cases where they
       cannot be placed in the objects global entry.  Reasons why they
       might not be so placed include:

        o  The object does not have a directory entry

        o  There is no authority to place the parameters in the
           global entry

        o  The parameters are not global --- they only make sense
           in the  context of the table.

   4.  It is desirable to group information together as a
       performance optimization, so that the block of information may be
       widely replicated.

   A table is represented as a single level subtree.  The root of the
   subtree is an entry of object class Table.  This is named with a
   common name descriptive of the table.  The table will be located
   somewhere appropriate to its function.  If a table is private to an
   MTA, it will be below the MTA's entry.  If it is shared by MTA's in
   an organization, it will be located under the organization.

   The generic table entry contains only a description.  All instances
   will be subclassed, and the subclass will define the naming
   attribute.  Two subclasses are defined:

Kille                       Standards Track                     [Page 2]
RFC 2293            Table and Subtrees in the X.500           March 1998

table OBJECT-CLASS ::= {
    SUBCLASS OF {top}
    MUST CONTAIN {commonName}
    MAY CONTAIN {manager}
    ID oc-table}

tableEntry OBJECT-CLASS ::= {
    SUBCLASS OF {top}
    MAY CONTAIN {description}                                       10
    ID oc-table-entry}

textTableEntry OBJECT-CLASS ::= {
    SUBCLASS OF {tableEntry}
    MUST CONTAIN {textTableKey}
    MAY CONTAIN {textTableValue}
    ID oc-text-table-entry}

textTableKey ATTRIBUTE ::= {
    SUBTYPE OF name                                                 20
    WITH SYNTAX DirectoryString {ub-name}
    ID at-text-table-key}

textTableValue ATTRIBUTE ::= {
    SUBTYPE OF name
    WITH SYNTAX  DirectoryString {ub-description}
    ID at-text-table-value}

distinguishedNameTableEntry OBJECT-CLASS ::= {
    SUBCLASS OF {tableEntry}                                        30
    MUST CONTAIN {distinguishedNameTableKey}
    ID oc-distinguished-name-table-entry}

distinguishedNameTableKey ATTRIBUTE ::= {
    SUBTYPE OF distinguishedName
    ID at-distinguished-name-table-key}

                     Figure 1:  Representing Tables

   1.  TextEntry, which define table entries with text keys,
       which may have single or multiple values of any type.  An
       attribute is defined to allow a text value, to support the
       frequent text key to text value mapping.  Additional values may
       be defined.

Kille                       Standards Track                     [Page 3]
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