IEC 81346-1:2009

FOREWORD
INTRODUCTION
   0.1 General
   0.2 Basic requirements for this standard
   0.3 Required properties of the standard
1 Scope
2 Normative references
3 Terms and definitions
4 Concepts
   4.1 Object
   4.2 Aspect
   4.3 Technical system
   4.4 Structuring
   4.5 Function
   4.6 Products and components
   4.7 Location
   4.8 Types, occurrences and individuals
5 Structuring principles
   5.1 General
   5.2 Forming structures (i.e. types and occurrences)
   5.3 Function-oriented structure
   5.4 Product-oriented structure
   5.5 Location-oriented structure
   5.6 Structures based on "other aspects"
   5.7 Structures based on more than one aspect
6 Construction of reference designations
   6.1 General
   6.2 Format of reference designations
       6.2.1 Single level
       6.2.2 Multi-level
       6.2.3 Use of letter codes
   6.3 Different structures within the same aspect
7 Reference designation set
8 Designation of locations
   8.1 General
   8.2 Assemblies
9 Presentation of reference designations
   9.1 Reference designations
   9.2 Reference designations set
   9.3 Presentation of identifiers for the top-node
10 Labelling
Annex A (informative) Historical background
Annex B (informative) Establishment and life cycle of objects
Annex C (informative) Manipulation of objects
Annex D (informative) Interpretation of reference
        designations using different aspects
Annex E (normative) Object represented with several top
        nodes in an aspect
Annex F (informative) Examples of multiple structures based
        on the same aspect
Annex G (informative) Example of structures and reference
        designations
Annex H (informative) Example of reference designations
        within a system
Bibliography

IEC 81346-1:2009, published jointly by IEC and ISO, establishes general principles for the structuring of systems including structuring of the information about systems. Based on these principles, rules and guidance are given for the formulation of unambiguous reference designations for objects in any system. The reference designation identifies objects for the purpose of creation and retrieval of information about an object, and where realized about its corresponding component. This edition includes the following substantial changes with respect to the previous one:

- a new introductory clause providing a description and explanation to the concepts used elsewhere in the publication;

- a more comprehensive description of the structuring principles and rules for structuring are provided;

- "other aspects" are introduced, and the prefix sign # is assigned to these aspects;

- the concept of reference designation group has been deleted;

- the specific term "transition" has been avoided and been replaced by an improved textual description of this phenomenon in annex D;

- a new clause about labelling is introduced;

- the old annexes have been removed with the exception of the annex showing an example of the application of reference designations within a system;

- a new annex explaining the manipulation of objects is introduced;

- 4 new annexes are introduced as rearrangement of detailed examples or explanatory information.

IEC 81346-1:2009 has the status of a horizontal standard in accordance with IEC Guide 108.