ISO/IEC 23091-1:2018

INTERNATIONAL ISO/IEC
STANDARD 23091-1
First edition
2018-04
Information technology — Coding-
independent code points —
Part 1:
Systems
Technologies de l'information — Points de code indépendants du
codage —
Partie 1: Systèmes
Reference number
©
ISO/IEC 2018
© ISO/IEC 2018
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ii © ISO/IEC 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Code points and usage . 1
4.1 General . 1
4.2 Applicability . 2
5 Principles for definition and referencing of code points . 2
5.1 Code point encoding and defaults . 2
5.2 Externally defined values . 3
5.3 Reference format . 3
5.4 URN format. 3
© ISO/IEC 2018 – All rights reserved iii

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO 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. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work. In the field of information technology, ISO and IEC have established a joint technical committee,
ISO/IEC JTC 1.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/IEC JTC1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
1)
Together with ISO/IEC 23091-2 and ISO/IEC 23091-3, this first edition of ISO/IEC 23091-1 cancels and
replaces ISO/IEC 23001-8:2016, which has been technically revised.
A list of all parts in the ISO/IEC 23091 series can be found on the ISO website.
1) Under preparation. Stage at time of publication: ISO/IEC DIS 23091-2:2017.
iv © ISO/IEC 2018 – All rights reserved

Introduction
There is a need to identify some characteristics of media that are logically independent of the
compression format (for example, aspects that relate to the sourcing or presentation or
...