Conversion of LDAP Schemas to and from SLP Templates
RFC 2926

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Network Working Group                                           J. Kempf
Request for Comments: 2926                        Sun Microsystems, Inc.
Category: Informational                                         R. Moats
                                                            Coreon, Inc.
                                                           P. St. Pierre
                                                  Sun Microsystems, Inc.
                                                          September 2000

          Conversion of LDAP Schemas to and from SLP Templates

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   This document describes a procedure for mapping between Service
   Location Protocol (SLP) service advertisements and lightweight
   directory access protocol (LDAP) descriptions of services.  The
   document covers two aspects of the mapping.  One aspect is mapping
   between SLP service type templates and LDAP directory schema.
   Because the SLP service type template grammar is relatively simple,
   mapping from service type templates to LDAP types is straightforward.
   Mapping in the other direction is straightforward if the attributes
   are restricted to use just a few of the syntaxes defined in RFC 2252.
   If arbitrary ASN.1 types occur in the schema, then the mapping is
   more complex and may even be impossible.  The second aspect is
   representation of service information in an LDAP directory.  The
   recommended representation simplifies interoperability with SLP by
   allowing SLP directory agents to backend into LDAP directory servers.
   The resulting system allows service advertisements to propagate
   easily between SLP and LDAP.

Kempf, et al.                Informational                      [Page 1]
RFC 2926               Conversion of LDAP Schemas         September 2000

Table of Contents

   1.0 Introduction ................................................  2
   2.0 Mapping SLP Templates to LDAP Schema ........................  3
     2.1 Mapping from SLP Attribute Types to LDAP Attribute Types ..  8
       2.1.1 Integer ...............................................  8
       2.1.2 String ................................................  8
       2.1.3 Boolean ...............................................  9
       2.1.4 Opaque ................................................  9
     2.2 Keyword Attributes ........................................  9
     2.3 Template Flags ............................................  9
       2.3.1 Multi-valued ..........................................  9
       2.3.2 Optional .............................................. 10
       2.3.3 Literal ............................................... 10
       2.3.4 Explicit Matching ..................................... 10
     2.4 Default and Allowed Value Lists ........................... 10
     2.5 Descriptive Text .......................................... 11
     2.6 Generating LDAP Attribute OIDs ............................ 11
     2.7 Example ................................................... 11
   3.0 Attribute Name Conflicts .................................... 15
   4.0 Mapping from Schema to Templates ............................ 15
     4.1 Mapping LDAP Attribute Types to SLP Attribute Types ....... 16
     4.2 Mapping ASN.1 Types to SLP Types .......................... 17
       4.2.1 Integer ............................................... 18
       4.2.2 Boolean ............................................... 18
       4.2.3 Enumerated ............................................ 18
       4.2.4 Object Identifier ..................................... 19
       4.2.5 Octet String .......................................... 19
       4.2.6 Real .................................................. 19
     4.3 Example ASN.1 Schema ...................................... 19
   5.0 Representing SLP Service Advertisements in an LDAP DIT ...... 22
   6.0 Internationalization Considerations ......................... 24
   7.0 Security Considerations ..................................... 24
   8.0 References .................................................. 25
   9.0 Authors' Addresses .......................................... 26
   10.0 Full Copyright Statement ................................... 27

1.0 Introduction

   SLP templates [1] are intended to create a simple encoding of the
   syntactic and semantic conventions for individual service types,
   their attributes, and conventions.  They can easily be generated,
   transmitted, read by humans and parsed by programs, as it is a string
   based syntax with required comments.  Directory schemas serve to
   formalize directory entry structures for use with LDAP [2] These
   directories serve to store information about many types of entities.