ISO/IEC 11404:2007

INTERNATIONAL ISO/IEC
STANDARD 11404
Second edition
2007-12-15
Information technology — General-
Purpose Datatypes (GPD)
Technologies de l'information — Types de données

Reference number
©
ISO/IEC 2007
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ii © ISO/IEC 2007 – All rights reserved

Contents Page
Foreword. vi
0 Introduction. vii
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Conformance.8
4.1 Direct conformance .8
4.2 Indirect conformance .9
4.3 Conformance of a mapping standard.9
4.4 GPD program conformance.10
5 Conventions used in this International Standard.10
5.1 Formal syntax.10
5.2 Text conventions .11
6 Fundamental notions .11
6.1 Datatype.11
6.2 Value space .12
6.3 Datatype properties .12
6.3.1 Equality .13
6.3.2 Order .13
6.3.3 Bound.13
6.3.4 Cardinality .14
6.3.5 Exact and approximate .14
6.3.6 Numeric.14
6.4 Primitive and non-primitive datatypes .15
6.5 Datatype generator .15
6.6 Characterizing operations .15
6.7 Datatype families .16
6.8 Aggregate datatypes .17
6.8.1 Homogeneity .17
6.8.2 Size.17
6.8.3 Uniqueness.17
6.8.4 Aggregate-imposed identifier uniqueness.18
6.8.5 Aggregate-imposed ordering .18
6.8.6 Access method .18
6.8.7 Recursive structure .19
6.8.8 Structured and unstructured .19
6.8.9 Mandatory and optional components.19
6.9 Provisions associated with datatypes.19
7 Elements of the Datatype Specification Language .21
7.1 IDN character-set .21
7.2 Whitespace .22
7.3 Lexical objects .23
7.3.1 Identifiers.23
7.3.2 Digit-string.23
7.3.3 Character-literal and string-literal.23
7.3.4 Keywords.24
7.4 Annotations .24
7.5 Values .25
© ISO/IEC 2007 – All rights reserved iii

7.5.1 Independent values. 25
7.5.2 Dependent values . 26
7.6 GPD program text . 27
8 Datatypes . 27
8.1 Primitive datatypes . 28
8.1.1 Boolean . 29
8.1.2 State. 30
8.1.3 Enumerated. 31
8.1.4 Character. 32
8.1.5 Ordinal. 33
8.1.6 Date-and-Time . 34
8.1.7 Integer . 35
8.1.8 Rational . 36
8.1.9 Scaled. 37
8.1.10 Real. 38
8.1.11 Complex . 40
8.1.12 Void. 41
8.2 Subtypes and extended types . 42
8.2.1 Range . 43
8.2.2 Selecting . 43
8.2.3 Excluding . 44
8.2.4 Size . 44
8.2.5 Explicit subtypes. 45
8.2.6 Extended . 45
8.3 Generated datatypes. 46
8.3.1 Choice . 47
8.3.2 Pointer . 49
8.3.3 Procedure. 50
8.4 Aggregate Datatypes . 53
8.4.1 Record . 55
8.4.2 Class. 56
8.4.3 Set. 58
8.4.4 Bag. 59
8.4.5 Sequence . 60
8.4.6 Array .
...