0 INTRODUCTION
1 SCOPE
2 DOCUMENT REFERENCES
3 DEFINITIONS
4 ABBREVIATIONS
5 CONFORMANCE
6 AUTHENTICATION SUPPORT
7 DIRECTORY SYSTEM SERVICE
8 DIRECTORY SYSTEM PROTOCOL
9 USE OF UNDERLYING SERVICES
Annex A: Classification Scheme
Annex B: X.500 Conformance
Annex C: Clarifications of Base Standards