IEC 61360-1:2002

INTERNATIONAL IEC
STANDARD 61360-1
Edition 2.1
2004-01
Edition 2:2002 consolidated with amendment 1:2003
Standard data element types with associated
classification scheme for electric components –
Part 1:
Definitions – Principles and methods

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INTERNATIONAL IEC
STANDARD 61360-1
Edition 2.1
2004-01
Edition 2:2002 consolidated with amendment 1:2003
Standard data element types with associated
classification scheme for electric components –
Part 1:
Definitions – Principles and methods

 IEC 2004  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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Commission Electrotechnique Internationale

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 61360-1 © IEC:2002+A1:2003(E)

CONTENTS
FOREWORD.4

1 General .6

1.1 Scope and object.6

1.2 ISO/IEC EXPRESS information model .6

1.3 Normative references .7

2 Definitions .8

3 Data element type specification attributes .10
3.1 Information model of a data element type .11
3.2 Identifying attributes.12
3.2.1 Code .13
3.2.2 Version number .13
3.2.3 Revision number.14
3.2.4 Preferred name .14
3.2.5 Synonymous name .14
3.2.6 Short name.15
3.2.7 Preferred letter symbol .16
3.2.8 Synonymous letter symbol.17
3.3 Semantic attributes .17
3.3.1 Definition.18
3.3.2 Note .18
3.3.3 Remark.18
3.3.4 Formula.18
3.3.5 Figure.19
3.3.6 Source document of data element type definition.19
3.4 Value attributes .19
3.4.1 Data type.21
3.4.2 Value format.23
3.4.3 Unit of measure .24
3.4.4 Value list .24
3.4.5 Referenced class identifier .26
3.5 Relationship attributes.26

3.5.1 Condition data element type .27
3.5.2 Data element type class .27
4 Data element type classification .27
4.1 Objective.27
4.2 General principles .27
4.3 Quantitative data element types .28
4.4 Non-quantitative data element types.29
5 Component class specification .29
5.1 Shape of package outlines for components .32
5.2 Component class specification attributes.32
5.3 Information model of a component class.33
5.4 Identifying attributes.33

61360-1 © IEC:2002+A1:2003(E) – 3 –

5.4.1 Code .34

5.4.2 Version number .34

5.4.3 Revision number.35

5.4.4 Preferred name .35

5.4.5 Coded name.35

5.4.6 Synonymous name .36

5.5 Semantic attributes .36

5.5.1 Definition.36

5.5.2 Note .37

5.5.3 Remark.37
5.5.4 Drawing reference .37
5.5.5 Source document of component class definition .37
5.6 Class relationships .38
6 Drawing specification attributes .39
6.1 Information model of a drawing .39
6.1.1 Code .40
6.1.2 Version number .40
6.1.3 Revision number.40
6.1.4 Drawing title .41
6.1.5 Descriptive designator .41
6.1.6 File name .41
6.1.7 File format .41

Annex A (normative) Characters from ISO/IEC 10646-1.42
Annex B (normative) Survey of type classification codes
of quantitative data element types.45
Annex C (normative) Survey of type classification codes
of non-quantitative data element types (main class A) .51
Annex D (informative) Example of a feature class construct.52

Figure 1 – Information model principle .11
Figure 2 – Identifying attributes for data element type.12
Figure 3 – Semantic attributes for data element type .17
Figure 4 – Value attributes for data element type .19
Figure 5 – Attributes of the value list for data element type.20
Figure 6 – Relationship attributes for data element type.26

Figure 7 – Classification tree .30
Figure 8 – Identifying attributes for class .33
Figure 9 – Semantic attributes for class .36
Figure 10 – Class relationships.38
Figure 11 – Identifying attributes for drawing .39

Table 1 – List of attributes of data element types .10
Table 2 – Transliteration .16
Table 3 – Survey of main classes and categories of data element types .28
Table 4 – List of attributes of class .32
Table 5 – List of attributes of drawing .39
Table A.1 – Group 00 – Plane 00 .42
Table C.1.51

– 4 – 61360-1 © IEC:2002+A1:2003(E)

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
STANDARD DATA ELEMENT TYPES WITH ASSOCIATED

CLASSIFICATION SCHEME FOR ELECTRIC COMPONENTS –

Part 1: Definitions – Principles and methods

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61360-1 has been prepared by subcommittee 3D: Data sets for
libraries, of IEC technical committee 3: Information structures, documentation and graphical
symbols.
This consolidated version of IEC 61360-1 consists of the second edition (2002) [documents
3D/93/FDIS and 3D/96/RVD] and its amendment 1 (2003) [documents 3D/120/FDIS and
3D/127/RVD].
The technical content is therefore identical to the base edition and its amendment and has
been prepared for user convenience.
It bears the edition number 2.1.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
61360-1 © IEC:2002+A1:2003(E) – 5 –

Annexes A, B and C form an integral part of this standard.

Annex D is for information only.

IEC 61360 consists of the following parts, under the general title Standard data element types

with associated classification scheme for electric components

– Part 1: Definitions – Principles and methods

– Part 2: EXPRESS dictionary schema

– Part 3: Maintenance and validation procedures

– Part 4: IEC reference collection of standard data element types, component classes and
terms
)
– Part 5: Extensions to the EXPRESS dictionary schema

The committee has decided that the contents of the base publication and its amendment 1 will
remain unchanged until 2005. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

________
1)
To be published.
– 6 – 61360-1 © IEC:2002+A1:2003(E)

STANDARD DATA ELEMENT TYPES WITH ASSOCIATED

CLASSIFICATION SCHEME FOR ELECTRIC COMPONENTS –

Part 1: Definitions – Principles and methods

1 General
1.1 Scope and object
This part of IEC 61360 provides a firm basis for the clear and unambiguous definition of
characteristic properties (data element types) of all elements of electrotechnical systems from
basic components to subassemblies and full systems. Although originally conceived in the
context of providing a basis for the exchange of information on electric/electronic
components, the principles and methods of this standard may be used in areas outside the
original conception such as assemblies of components and electrotechnical systems and
subsystems.
In addition, the standard provides for establishing a classification hierarchy and the allocation
of applicable and relevant properties to each of the classes so established in order to
describe fully the characteristics of objects belonging to that class.
Use of this standard facilitates the exchange of data describing electrotechnical systems
through a defined structure for the information to be exchanged in a computer-sensible form.
Each property to be exchanged will have an unambiguously defined meaning and consistent
naming, where relevant a defined value list, a prescribed format and defined units of measure
for all quantitative values. There is also provision for
– control of changes to definitions of the properties through version and revision numbers;
– inclusion of notes and remarks to clarify and help in the application of the definitions;
– indication of the sources of definitions and value lists;
– associated figures and formulae.
1.2 ISO/IEC EXPRESS information model
Closely associated with this part of IEC 61360 is IEC 61360-2. This part contains the
information model, using the EXPRESS modelling language. In this model, the definition and
structure of IEC 61360-1 is formalized and presented in a computer-sensible form. Use of this

information model allows dictionary information to be exchanged between different systems
using the STEP Physical File Format as defined in ISO 10303-21.
This information model has also been accepted as the common information model and is
reproduced as ISO 13584-42. Use may be made of other standards in the ISO 13584 series of
standards for extension of the concepts defined in this standard. In particular ISO 13584-24
contains provisions which allow
– extensions of the class structure to include feature and functional model classes;
– tabulation of properties;
– functional relationships among properties;
– references to graphical information;
– structuring of parts libraries.

61360-1 © IEC:2002+A1:2003(E) – 7 –

1.3 Normative references
The following referenced documents are indispensable for the application of this document.

For dated references, only the edition cited applies. For undated references, the latest edition

of the referenced document (including any amendments) applies.

IEC 60027 (all parts), Letter symbols to be used in electrical technology

IEC 60191-4:1999, Mechanical standardization of semiconductor devices – Part 4: Coding

system and classification into forms of package outlines for semiconductor device packages

IEC 60747 (all parts), Semiconductor devices – Discrete devices

IEC 60748 (all parts), Semiconductor devices – Integrated circuits
IEC 61360-2: 2002, Standard data element types with associated classification scheme for
electric components – Part 2: EXPRESS dictionary schema
IEC 61360-4:1997, Standard data element types with associated classification scheme for
electric components – Part 4: IEC reference collection of standard data element types,
component classes and terms
ISO/IEC 646:1991, Information technology – ISO 7-bit coded character set for information
interchange
ISO/IEC 6429:1992, Information technology – Control functions for coded character sets
ISO/IEC 10646-1:2000, Information technology – Universal Multiple-Octet Coded Character
Set (UCS) – Part 1: Architecture and Basic Multilingual Plane
ISO/IEC 11179-3:1994, Information technology – Specification and standardization of data
elements – Part 3: Basic attributes of data elements
ISO 31 (all parts), Quantities and units
ISO 843:1997, Information and documentation – Conversion of Greek characters into Latin
characters
ISO 2382 (all parts), Information technology – Vocabulary
ISO 6093:1985, Information processing – Representation of numerical values in character
strings for information interchange
ISO 9735:1988, Electronic data interchange for administration, commerce and transport
(EDIFACT) – Application level syntax rules

ISO 10303-21:1994, Industrial automation systems and integration – Product data
representation and exchange – Part 21: Implementation methods: Clear text encoding of the
exchange structure
ISO 13584-24, Industrial automation systems and integration – Parts library – Part 24: Logical
2)
resources: Logical model of supplier library
ISO 13584-42:1998, Industrial automation systems and integration – Parts library – Part 42:
Description methodology: Methodology for structuring part families
________
2)
To be published.
– 8 – 61360-1 © IEC:2002+A1:2003(E)

2 Definitions
For the purpose of this part of IEC 61360, the following definitions apply.

2.1
entity
any concrete or abstract object of interest, including relations among things

2.2
relation
observed connection between entities
2.3
data element type
unit of data for which the identification, description and value representation have been
specified
2.4
data element type class
class of data element types with the same type of representation, or description or value
representation
2.5
quantitative data element type
data element type with a numerical value representing a measurable physical quantity, a
quantity of information or a count of objects
2.6
non-quantitative data element type
data element type which identifies or describes an object by means of codes, abbreviations,
names, references or descriptions
2.7
condition data element type
kind of data element type whose value affects the value of another data element type
NOTE 1  A condition data element type has only a meaning when it is used in combination with another data
element type.
NOTE 2  A condition data element type does not form part of the classification tree and can be used on every level
of the classification.
2.8
classifying data element type
data element type applicable for a particular component class, addressing a single elementary
attribute of that component and having a homogeneous complementary value list, whose
values define the component subclasses
2.9
classification
systematic division of a set of items into subsets according to their difference in some
predetermined characteristics
2.10
attribute
any one of the properties to describe an entity, possibly involving one or more other entities

61360-1 © IEC:2002+A1:2003(E) – 9 –

2.11
product
result of labour or of a natural or industrial process

2.12
component
industrial product which serves a specific function or functions, which is not decomposable or

physically divisible and which is intended for use in a higher order assembled product

2.13
electric component
component with conductive terminals through which voltages or currents may be applied or
delivered
NOTE  Electric components and electric transducers are included in this definition.
2.14
component class
set of components of which each component can be described by the same group of data
element types
2.15
material
basic matter (such as metal, wood, plastic, fibre) from which the greater part of something
physical is made
2.16
feature
generalized property described by a group of related properties
2.17
geometry
a surface shape (as of a mechanical part or a crystal)
2.18
computer-sensible information
information which can be exchanged and manipulated with the interactive use of computer
systems, programs and procedures
2.19
applicable data element type
data element type that is defined for a component class and which applies to all components
belonging to that class
2.20
visible data element type
data element type that is defined for a component class but which may or may not apply to
any component belonging to that class
NOTE 1  The code of the class where a data element type is defined as visible is part of the identification of this
data element type.
NOTE 2  Within the IEC, all data element types are defined as visible at the level of the root class, that is the
superclass of the component class, material class and geometry class.
2.21
shape
external form of a component package as given by the set of data element types

– 10 – 61360-1 © IEC:2002+A1:2003(E)

2.22
outline style
physical information enclosing the apparently plane figure presented by any object to sight,

contour and/or external boundary of a component

2.23
package
term applied to an electric or electromechanical component which covers the physical outline
of the component, including terminals and any protective material or casing

2.24
drawing
a drawing illustrates the meaning of a group of data element types describing the geometrical
characteristics of a component
3 Data element type specification attributes
In this clause the various attributes of data element types as encountered in the specifications
are explained. For a list of these attributes, see table 1. These attributes are related to
identification, description, value of data element types and relationships between data
element types.
Table 1 – List of attributes of data element types
Attributes Subclause
Code 3.2.1
Version number 3.2.2
Revision number 3.2.3
Preferred name 3.2.4
Synonymous name 3.2.5
Short name 3.2.6
Preferred letter symbol 3.2.7
Synonymous letter symbol 3.2.8
Definition 3.3.1
Note 3.3.2
Remark 3.3.3
Formula 3.3.4
Figure 3.3.5
Source document of data element type definition 3.3.6
Data type 3.4.1
Value format 3.4.2
Unit of measure 3.4.3
Value list 3.4.4
Value 3.4.4.1
Value code 3.4.4.2
Value meaning 3.4.4.3
Source document(s) of value list(s) 3.4.4.4
Referenced class identifier 3.4.5
Condition data element type 3.5.1
Data element type class 3.5.2
61360-1 © IEC:2002+A1:2003(E) – 11 –

For the representation of the attributes of the data element types, in general upper-case
letters and lower-case letters are used according to the existing international standards from

which the attributes are taken. When no standard exists, the commonly used IEC

methodology is followed (IEC 60027 and IEC 60748). Characters are compliant with the

character set as defined in annex A.

3.1 Information model of a data element type

Based on the principles as described in ISO/IEC 11179-3, the attributes of a data element

type are divided into four main groups:

– identifying related attributes;
– semantic related attributes;
– value related attributes;
– relationship attributes of a data element type related to relations among entities.
In the following subclauses, the attributes are specified and clarified by the information
models.
The information models (entity-relation diagrams), given in figures 2, 3, 4, 5 and 6, of a data
element type shall be read as follows:
– from inside outwards starting with the entity in bold capital letters;
– (related) entities are indicated by ellipses;
– relation between an entity and an (related) entity is indicated by the line between those
ellipses;
– text accompanying the line between an entity and an (related) entity describes the relation;
– the combination of a relation and an entity constitutes the attribute of a data element type;
– two figures separated by a dot indicate the occurrence of the attribute: the first digit
indicates the minimum number of occurrences, the second one, the maximum number of
occurrences;
– relations and the corresponding occurrence indications are on the same side of the
relation-line positioned;
– in the information models the name of the entities shall be given in capitals and the name
of the related entities shall be given in lower case.

1.1 known by
DATA ELEMENT
preferred name
TYPE
IEC  506/02
Entity: DATA ELEMENT TYPE
Relation: known by
Related entity: preferred name
Attribute: known by preferred name
NOTE  The attribute is composed of the relation and the relevant entity.
Cardinality: 1.1 (one and not more than one)
Figure 1 – Information model principle

– 12 – 61360-1 © IEC:2002+A1:2003(E)

3.2 Identifying attributes
To identify a data element type uniquely within the IEC reference collection, IEC 61360-4 and,

for electronic information exchange, a language independent combination of characters shall

be used.
The identifier of a data element type shall consist of the combination of the six-character data

element type code, followed by a hyphen followed by the three-digit version number of the

data element type. The identifier shall be used for the identification of different occurrences of

the same data element type code.

Figure 2 shows the possible attributes of a data element used to identify a data element type.
code
has
synonymous
version number
letter symbol
represented by
has
1.1
0.2
1.1
preferred represented by 0.1
DATA ELEMENT
revision number
letter symbol
TYPE has
1.1
1.1
1.1
0.2
known by
known by
short name
preferred name
known by
synonymous
name
IEC  507/02
Figure 2 – Identifying attributes for data element type

61360-1 © IEC:2002+A1:2003(E) – 13 –

3.2.1 Code
Attribute name: code
Attribute definition: unique six-character code of a data element type

Comments: the first three characters shall be alphabetic, the last three numeric

3)
(format AAANNN). The character "X" shall not be used as first

character. The codes are issued sequential and should not have any

relationship with the meaning of the data element types.

In case of at least one attribute of the data element type, which

affects the meaning and or communication of the data element type is

changed, a new (other) data element type, having a new code, shall

be defined. Such attributes are:
− definition;
− unit of measure;
− condition data element type;
− value format;
4)
− value code
− data type
Obligation: mandatory
Character type upper-case latin letters A through Z (to avoid misunderstanding, the
of values: upper-case Latin letters O and I shall not be used) digits 0 through 9
3.2.2 Version number
Attribute name: version number
Attribute definition: number used to control the versions of a data element type
5)
Comments:
the version number of a data element type shall consist of three digits .
Consecutive version numbers shall be issued in ascending order.
A new version of the data element type shall be generated if at least
one attribute of the data element type is changed which affects the
use (communication, data base definition, etc.) but which does not
affect the meaning of that data element type.
Those attributes which, when changed, will result in a version change
are:
– preferred name – short name

– preferred letter symbol – preferred name of condition
– component class – data element type
(see super/subclass
– value code
as described in figure 10)
– reference class identifier
– value meaning
– note
Obligation: mandatory
Character type digits 0 through 9
of values:
________
3)
For local or private use within users' environment, codes starting with XAA up to and including codes starting
with XZZ, may be used and are therefore excluded from the IEC reference collection of standard data element
types (IEC 61360-4).
4)
Whether the code should be changed, so that a new data element type is generated, or whether the version
number of a data element type should be changed, is to be determined for each case separately.
5)
Although the common ISO/IEC EXPRESS information model allows more digits, within the IEC system only
three digits are to be used.
– 14 – 61360-1 © IEC:2002+A1:2003(E)

3.2.3 Revision number
Attribute name: revision number

Attribute definition: number used for administrative control of a data element type

Comments: the revision number of a data element type occurrence shall

consist of two digits. Consecutive revision numbers shall be

issued in ascending order. Per data element type, unique by its

identifier, only one revision number is current at any moment.

A new revision number of a data element type shall be generated

if an attribute of the data element type is changed which neither

affects the use (communication, data base definitions etc.) nor

the meaning of the data element type, or when editorial changes
of typing and spelling errors have been implemented.
Those attributes which, when changed, will result in a revision
change are:
– synonymous name – source document of DET
definition
– synonymous letter symbol
– source document of value list
– remark
– spelling error in the text of the
– data element type class
definition
– formula
– figure
The revision number shall be reset to the starting number 01
when the version number is changed.
Obligation: mandatory
Character type of values: digits 0 through 9
3.2.4 Preferred name
Attribute name: preferred name
Attribute definition: single-word or multi-word designation assigned to a data element
type
Comments: the preferred name of a data element type shall be identical to the
name as used in international standards, if available. The length
of the preferred name shall be limited to 70 characters
Obligation: mandatory
Character type of values: those characters from the character set of ISO/IEC 10646-1, as
defined in annex A
3.2.5 Synonymous name
Attribute name: synonymous name
Attribute definition: single-word or multi-word designation that differs from the given

preferred name but represents the same data element type
concept
Comments: the number of synonymous names shall be limited to two. For
pragmatic reasons, the length of the synonymous name shall be
limited to 70 characters
Obligation: optional
Character type those characters from the character set of ISO/IEC 10646-1, as
of values: defined in annex A
61360-1 © IEC:2002+A1:2003(E) – 15 –

3.2.6 Short name
Attribute name: short name
Attribute definition: shortened representation of the preferred name of the data
element type
Comments: the first character of the short name shall be a letter:

− preceded by a "@" character for a condition data element type

− preceded by a "$" character when defining a specific Greek

letter (if applicable the "@" character precedes the "$"

character).
− For quantitative data element types, the short name shall be
derived from the preferred letter symbol in compliance with
the following rules:
− Greek letters that are graphically identical to Latin letters are
not converted;
− specific Greek letters shall be represented by a single Latin
letter according table 2 (ISO 843, table 1). For retranslation
the translated Greek letters shall be preceded by a dollar "$"
character;
− superscripts shall be indicated by Latin letter(s) preceded by
an asterisk "*" character;
b
− Example: letter symbol; α ---->> short name: $a*b
− subscripts shall be indicated by Latin letter(s) preceded by an
underline "_" character;
− Example: λ ------>> short name: $l_peak
peak
− thru scripts shall be placed next to the main character;
− Example: letter symbol: â ---->> short name: a^
− For non-quantitative data element types, the short name shall
be a short representation of the preferred name. The length of
the short name of a data element type shall be limited to 17
characters. This short name shall be unique within each
component class
Obligation: mandatory
Character type of values: conforming with the character set of ISO/IEC 10646-1

– 16 – 61360-1 © IEC:2002+A1:2003(E)

Table 2 – Transliteration
Greek character Latin character

Upper case Lower case Upper case Lower case

1 A α A a
2 Β β B b
3 Γ γ G g
4 ∆ δ D d
5 Ε ε E e
6 Ζ ζ Z z
7 Η η I I
8 Θ θ TH th
9 Ι ι ƒ or I6 ♣ or i6
10 Κ κ K k
11 Λ λ L l
12 Μ µ M m
13 Ν ν N n
14 Ξ ξ X x
15 Ο ο O o
16 Π π P p
17 Ρ ρ R r
18 Σ σ, ς S s, s
19 Τ τ T t
20 Υ υ Y y
21 Φ ϕ F f
22 Χ χ CH ch
23 Ψ ψ PS ps
24 Ω ω σ or O6 O or o6
NOTE  In case the character set does not support the overline
character, the apostrophe character is to be used instead of the
overline character.
3.2.7 Preferred letter symbol
Attribute name: preferred letter symbol
Attribute definition: mark or characters used as a sign for expressing an object, for
example the characters standing for chemical elements in the
periodic system (Ag = silver) or the characters standing for electrical
concepts (f = frequency, T = ambient temperature)
amb
Comments: the preferred letter symbol of a data element type shall be identical to
the letter symbol of IEC 60027, IEC 60747 or IEC 60748. The first
character of the preferred letter symbol of a condition data element
type shall be a "@"
Obligation: optional
Character type those characters from the character set of ISO/IEC 10646-1, as
of values: defined in annex A
61360-1 © IEC:2002+A1:2003(E) – 17 –

3.2.8 Synonymous letter symbol

Attribute name: synonymous letter symbol

Attribute definition: mark or characters used as a sign for expressing some object that

differs from the preferred letter symbol but represents the same data

element type concept
Comments: synonymous letter symbols are sometimes inevitable for historical

reasons. The number of synonymous letter symbols shall be limited

to two. The first character of the synonymous letter symbol of a

condition data element type shall be a "@" The length of the

synonymous letter symbol shall be limited to 17 characters
Obligation: optional
Character type those characters from the character set of ISO/IEC 10646-1, as
of values: defined in annex A
3.3 Semantic attributes
Figure 3 shows the possible attributes of a data element type used to clarify the semantics of
a data element type.
definition
meaning given by
source document
note
of DET definition
derived from
included with
1.1
0.1
supplemented
0.1
by
0.1
DATA ELEMENT
figure remark
TYPE
0.1 clarified by
0.1
represented
by
formula
IEC  508/02
Figure 3 – Semantic attributes for data element type

– 18 – 61360-1 © IEC:2002+A1:2003(E)

3.3.1 Definition
Attribute name: definition
Attribute definition: statement that describes the meaning of a data element type in an

unambiguous and unique manner to permit its differentiation from all

other data element types
Comments: the definition of a data element type shall be derived from the

original IEC or ISO definition, if available. IEC or ISO standards may

differ because condition data element types may be added to the

definition and references to relevant component classes are made.

The unit of measure (if present) in which the value of the data
element type is expressed shall always be included in the definition
Obligation: mandatory
Character type those characters from the character set of ISO/IEC 10646-1, as
of values: defined in annex A
3.3.2 Note
Attribute name: note
Attribute definition: statement which provides further information on the definition, which
is essential to the understanding of that definition
Obligation: optional
Character type those characters from the character set of ISO/IEC 10646-1, as
of values: defined in annex A
3.3.3 Remark
Attribute name: remark
Attribute definition: explanatory text to further clarify the meaning of the definition
Comments: remarks shall not influence the meaning of the definition
Obligation: optional
Character type those characters from the character set of ISO/IEC 10646-1, as
of values: defined in annex A
3.3.4 Formula
Attribute name: formula
Attribute definition: rule or statement in mathematical form expressing semantics of a
quantitative data element type
Comments: a formula shall not change any essential information of the meaning
of that definition. The graphical representation of a formula shall be
stored in a file in a general available format. Methods of referencing
to such a file are in detailed described in ISO 13584-24
Obligation: optional
Character type those characters from the character set of ISO/IEC 10646-1, as
of values: defined in annex A. The required control functions should be taken
from ISO/IEC 6429
61360-1 © IEC:2002+A1:2003(E) – 19 –

3.3.5 Figure
Attribute name: figure
Attribute
...