ISO/IEC 14957:1996
(Main)Information technology — Notation of format for data element values
Information technology — Notation of format for data element values
Specifies the notation for stating the format, i. e. the character types used in the representation of data elements, the length of these representations and additional notations relative to the representation of numerical figures. It does not cover control characters.
Technologies de l'information — Notation du format pour les valeurs des éléments de données
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Standards Content (Sample)
INTERNATIONAL
lSO/IEC
STANDARD 14957
First edition
1996-I 2-l 5
Information technology - Notation of
format for data element values
Technologies de /‘information - Notation du format pour /es valeurs des
Mments de don&es
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ISO/IEC 14957: 1996(E)
1
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.~
1
Normative References . . .I.“.~.
1
Definitions .,.,.,.,.~.,.
Notation relative to character types and length of representation of a data
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element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.
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4.1 Character type notation
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4.1 .l Normal types .
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4.1.2 mixed types .
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4.1.3 Extended types
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4.2 Length .
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4.2.1 Fixed length .
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4.2.2 Variable length
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4.2.3 Length expressed by a number of lines of characters
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5 Additional notation for figures
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5.1 Numeration system .
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5.2 Notation for non computable format specification
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52.1 Numbers .
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5.2.2 Positive and negative numbers .
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5.3 Notation for computable format specification
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5.3.1 Types of computable formats
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5.3.2 Integer formats
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5.3.3 Decimal formats .
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5.3.4 Floating comma format .
0 lSO/IEC 1996
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Printed in Switzerland
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0 ISOAEC ISO/IEC DIS 14957:1996(E)
Foreword
IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of IS0 or IEC participate in the development of International Standards through
technical committees established by the respective organization to deal with particular fields of
technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with IS0 and IEC, also
take part in the work.
In the field of information technology, IS0 and IEC have established a joint technical committee,
ISOAEC JTC 1. Draft International Standards adopted by the joint technical committee are
circulated to national bodies for voting. Publication as an International Standard requires approval
by at least 75 % of the national bodies casting a vote.
This International Standard ISOAEC 14957 was prepared by Joint Technical Committee ISOAEC
JTC 1, Information technology, Subcommittee SC 14, Data element principles.
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ISOAEC 14957:1996(E) 0 ISO/IEC
Introduction
Data interchange is experiencing rapid expansion, in the commercial, technical and public sectors.
It gives rise to inter working between different communities which often have developed
independently information processing applications and telecommunication networks which meet
specific needs. Hence an overall situation which suffers from a lack of homogeneity.
In order to remedy this situation, an urgent standardization effort focused in particular on the
representation of data elements is necessary.
The representation of a data element supposes in the first place that the format, i.e. the type of
characters used in the representation and in the length of the latter is specified. So that these
specifications have the same significance for everyone involved, it is necessary to express them in
accordance with standardized conventions.
Such rules are likely to eliminate any and all risk of ambiguity, lack of understanding and error;
they also facilitate the comparison of data element dictionaries, the design and creation of
information systems as well as electronic data interchange (EDI).
These notations have been partially and variously expressed in different International Standards
according to the specific contexts in which they have been defined, e.g. EDIFACT (IS0 9735),
Banking Standards (as IS0 7982-l), Character sets (IS0 8859), Information processing (IS0
6093).
Therefore, the objective of this International Standard is to provide a unique source of reference
on this issue for all Standards utilizing these type of notations independently of their environments.
iv
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INTERNATIONAL STANDARD OISOAEC ISO/IEC 14957:1996(E)
Information technology - Notation of format for data element
values
1 Scope
This International Standard specifies the notation to be used for stating the format, i.e. the
character types used in the representation of data elements and the length of these
representations. It also specifies additional notations relative to the representation of numerical
figures.
The scope of this International Standard is limited to graphic characters as digits, letters and
special characters. It does not cover control characters.
These rules are applicable wherever there is reason for specifying these characteristics.
Applications include data elements dictionaries, the processing of information and EDI.
2 Normative References
The following standards contain provisions which, through reference in the text, constitute
provisions of this International Standard. At the time of publication, the editions indicated were
valid. All standards are subject to revision, and parties to agreements based on this International
Standard are encouraged to investigate the possibility of applying the most recent editions of
standards indicated below. Members of IEC and IS0 maintain reaisters of currentlv valid
International Standards.
IS0 2382.4:1987, Information processing systems - Vocabulary - Parl 04: Organization of data.
IS0 6093: 1985, Information processing - Representation of numerical
values in character strings
for information interchange.
ISO/IEC 11179-3:1994, Information techno/‘ogy - Specification and standardization of data
elements - Part 3: Basic attributes of data elements.
I EC 1360-l : 1995, Standard data element types with associated classification scheme for electric
components - Pati 1: Definitions - Principles and methods.
3 Definitions
For the purposes of this International Standard, the following definitions apply.
3.1 data element : A unit of data for which the definition, identification, representation and
permissible values are specified by means of a set of attr
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