4 © OSS,31 May 1999
1 Introduction 47
2 The example 48
2.1 The top-level type 49
2.2 Bold is what matters! 49
2.3 Names in italics are used to tie things together 49
2.4 Names in normal font are the names of fields/elements/items 50
2.5 Back to the example! 50
2.6 The BranchIdentification type 52
2.7 Those tags 54
3 Getting rid of the different fonts 55
4 Tying up some lose ends 56
4.1 Summary of type and value assignments 56
4.2 The form of names 57
4.3 Layout and comment 57
5 So what else do you need to know? 58
Chapter 3 Structuring an ASN.1 specification 60
1 An example 61
2 Publication style for ASN.1 specifications 62
2.1 Use of line-numbers. 63
2.2 Duplicating the ASN.1 text 64
2.3 Providing machine-readable copy 64
3 Returning to the module header! 65
3.1 Syntactic discussion 65
3.2 The tagging environment 67
3.2.1 An environment of explicit tagging 68
3.2.2 An environment of implicit tagging 68
3.2.3 An environment of automatic tagging 68
3.3 The extensibility environment 69
4 Exports/imports statements 71
5 Refining our structure 73
6 Complete specifications 76
7 Conclusion 77
Chapter 4 The basic data types and construction mechanisms - closure 78
1 Illustration by example 79
2 Discussion of the built-in types 80
2.1 The BOOLEAN type 80
2.2 The INTEGER type 80
2.3 The ENUMERATED type 82
2.4 The REAL type 83
2.5 The BIT STRING type 84
2.6 The OCTET STRING type 87
2.7 The NULL type 88
2.8 Some character string types 88
2.9 The OBJECT IDENTIFIER type 89
2.10 The ObjectDescriptor type 90
2.11 The two ASN.1 date/time types 91
3 Additional notational constructs 93
3.1 The selection-type notation 93
3.2 The COMPONENTS OF notation 94
3.3 SEQUENCE or SET? 95
3.4 SEQUENCE, SET, and CHOICE (etc) value-notation 96
4 What else is in X.680/ISO 8824-1? 97
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