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.

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 document 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 or www.iec.ch/members_experts/refdocs).

ISO and IEC draw attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held responsible for identifying any or all such patent rights.

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of 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 www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.

This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 35, User interfaces.

This second edition cancels and replaces the first edition (ISO/IEC 9995-11:2015), which has been technically revised.

The main changes are as follows:

new subclause 4.3 “Alternative handling of dead keys in environments using ISO/IEC 10646”;
new subclause 4.5 “Combination of a dead key with itself”, providing a way to enter combining characters directly in an ISO/IEC 10646 environment;
new subclause 4.6 “Combinations of dead keys with digits and mathematical characters”, providing a way to enter superscript and subscript digits and mathematical characters;
dropping some “peculiar character” combinations in Table 3 which conflict with the mechanism specified in the new subclause 4.5.

A list of all parts in the ISO/IEC 9995 series can be found on the ISO and IEC websites.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-committees.

1 Scope

This document defines the functionality of dead keys and repertoires of characters entered by dead keys within the general scope described in ISO/IEC 9995-1.

This document is primarily intended for word-processing and text-processing applications.

2 Normative references

3 Terms and definitions

4 Functionality of dead keys, and relation to "combining characters" as defined in ISO/IEC 10646

4.1 General

4.2 Recommended handling of dead keys in environments using ISO/IEC 10646

4.3 Alternative handling of dead keys in environments using ISO/IEC 10646

4.4 Combinations of dead keys with the Space character

4.5 Combination of a dead key with itself

4.6 Combinations of dead keys with digits and mathematical characters

4.7 Combinations of dead keys with other characters, yielding peculiar characters

5 Labelling diacritical marks on keytops

5.1 General

5.2 Labelling diacritical marks used as dead keys

5.3 Labelling diacritical marks not used as dead keys

Bibliography