CONTENTS
Page
Introduction ................................................................................................................................................................. iv
1 Scope .............................................................................................................................................................. 1
2 Normative references ..................................................................................................................................... 1
2.1 Identical Recommendations | International Standards ........................................................................ 1
3 Definitions...................................................................................................................................................... 1
3.1 Specification of basic notation ............................................................................................................ 1
3.2 Constraint specification....................................................................................................................... 1
3.3 Parameterization of ASN.1 specification ............................................................................................ 1
3.4 Additional definitions.......................................................................................................................... 2
4 Abbreviations ................................................................................................................................................. 3
5 Convention ..................................................................................................................................................... 3
6 Notation.......................................................................................................................................................... 3
6.1 Assignments........................................................................................................................................ 3
6.2 Types................................................................................................................................................... 3
6.3 Values ................................................................................................................................................. 4
6.4 Elements.............................................................................................................................................. 4
7 ASN.1 lexical items........................................................................................................................................ 4
7.1 Information object class references..................................................................................................... 4
7.2 Information object references.............................................................................................................. 4
7.3 Information object set references ........................................................................................................ 4
7.4 Type field references........................................................................................................................... 4
7.5 Value field references ......................................................................................................................... 4
7.6 Value set field references .................................................................................................................... 5
7.7 Object field references ........................................................................................................................ 5
7.8 Object set field references................................................................................................................... 5
7.9 Word ................................................................................................................................................... 5
7.10 Additional keywords ........................................................................................................................... 5
8 Referencing definitions .................................................................................................................................. 5
9 Information object class definition and assignment ....................................................................................... 6
10 Syntax List...................................................................................................................................................... 9
11 Information object definition and assignment ................................................................................................ 11
12 Information object set definition and assignment........................................................................................... 13
13 Associated tables ............................................................................................................................................ 15
14 Notation for the object class field type........................................................................................................... 15
15 Information from objects................................................................................................................................ 17
Annex A – The TYPE-IDENTIFIER information object class ................................................................................. 20
Annex B – Abstract syntax definitions ...................................................................................................................... 21
Annex C – The instance-of type ................................................................................................................................ 22
Annex D – Examples................................................................................................................................................. 24
D.1 Example usage of simplified OPERATION class............................................................................... 24
D.2 Example usage of "ObjectClassFieldType" ........................................................................................ 25
D.3 Illustrate usage of objects and object sets............................................................................................ 25
Annex E – Tutorial annex on the ASN.1 model of object set extension.................................................................... 27
Annex F – Summary of the notation.......................................................................................................................... 28
ITU-T Rec. X.681 (07/2002) iii