ISO/IEC INTERNATIONAL STANDARD 24757 First edition 2008-11-01 Information technology Keyboard interaction model Machine-readable keyboard description Technologiesdel'information-Modeled'interactions surclaviers- Descriptiondeclavierlisiblealamachine Reference number ISO/IEC 24757:2008(E) IEC [so ISO/IEC2008 ISO/IEC 24757:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHTPROTECTEDDOCUMENT ISO/IEC2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Case postale 56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO/IEC 2008 All rights reserved ISO/IEC24757:2008(E) Contents Page Foreword. Introduction 1 Scope. 2 Conformance 3 Normative references.... 4 Terms and definitions... 5 Requirements... 5.1 Descriptionofkeysandkeyboard layouts 5.2 States resulting from the interaction offunction keys used for input 5.3 Specialkeys 5.4 Deadkeys... 5.5 Stickiness and stable (explicit) locking ortemporary (implicit) latching 5.6 Supplementarykeys (accessibleornotbythecomputer software); Email, Fnfunction keys,《Windows》keys,Sleep,On/Off).... 5.7 Complex state change (mainlyforaccessibility purposes). 5.8 Keyboard feedback... 6 5.9 Machine-readable keyboard description language...... AnnexA(normative)Protocolforthe exchangeof informationbetweenthehardwarekeyboard and the software... 8 AnnexB (normative)Formal description language. 9 B.1 Introduction. B.2 Overview B.3 Sections 9 B.3.1 Dictionaries 9 B.3.2 10 Meta-information.. B.3.3 Non-functional information.. 10 B.3.4 Functional information.. B.4 AspecificationinRELAXNGlanguageofthekeyboard descriptionformat. 11 B.5 Adescription in EBNF language of the keyboard format.... 14 B.5.1 14 B.5.2 GrammarforISO/IEC24757RelaxNGdescriptions. .15 B.6 An example keyboard description .. 16 B.7 Format in XML syntax..... 17 AnnexC (informative)Brief History of computerkeyboards and their associated software... 24 C.1 The IBM keyboard............. C.2 The AT and PS/2 keyboard ... .24 C.3 The USB keyboard... 25 AnnexD (informative)FormatMapping.... 26 D.1 26 D.2 Unix/LinuxXWindowxkbkeyboard format... D.2.1 xkb description ..... .26 D.2.2 xkbexample 26 D.2.3 Exampleofkeyboarddescription inISO/IEC24757syntax.. D.2.4 Programtoconvertxkb descriptionstoISO/lEC24757format. 122 Bibliography 136 @ ISO/IEC 2008 All rights reserved ili ISO/IEC24757:2008(E) 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 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. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires a