1、BSI Standards PublicationBS ISO/IEC 9995-11:2015Information technology Keyboard layouts for officesystemsPart 11: Functionality of dead keys andrepertoires of characters entered by deadkeysBS ISO/IEC 9995-11:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO/
2、IEC9995-11:2015.The UK participation in its preparation was entrusted to TechnicalCommittee ICT/-/6, ICT Accessibility Co-ordination.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisio
3、ns of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 82468 5ICS 35.180Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under
4、the authority of theStandards Policy and Strategy Committee on 30 June 2015.Amendments issued since publicationDate Text affectedBS ISO/IEC 9995-11:2015Information technology Keyboard layouts for office systems Part 11: Functionality of dead keys and repertoires of characters entered by dead keysTec
5、hnologies de linformation Dispositions de claviers bureautiques Partie 11: Fonctionnalit des touches mortes et rpertoires de caractres entrs par touches mortesINTERNATIONAL STANDARDISO/IEC9995-11Reference numberISO/IEC 9995-11:2015(E)First edition2015-06-01 ISO/IEC 2015BS ISO/IEC 9995-11:2015ii ISO/
6、IEC 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or postin
7、g on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 7
8、49 09 47copyrightiso.orgwww.iso.orgISO/IEC 9995-11:2015(E)BS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E)Foreword iv1 Scope . 12 Conformance . 13 Normative references 14 Terms and definitions . 15 Functionality of dead keys, and relation to “combining characters” as defined in ISO/IEC 10646 . 25.1 Ha
9、ndling of dead keys in environments using ISO/IEC 10646 . 25.2 Combinations of dead keys with the Space character . 35.3 Combinations of dead keys with other characters, yielding peculiar characters 4 ISO/IEC 2015 All rights reserved iiiContents PageBS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E)Fore
10、wordISO (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 c
11、ommittees 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 t
12、he 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 c
13、riteria 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).Attention is drawn to the possibility that some of the elements of this document may be the subject of p
14、atent rights. ISO and IEC 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
15、 name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Tech
16、nical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/IEC JTC 1, Information technology, Subcommittee SC 35, User interfaces.ISO/IEC 9995 consists of the following parts, under the general title Information techno
17、logy Keyboard layouts for office systems: Part 1: General principles governing keyboard layouts Part 2: Alphanumeric section Part 3: Complementary layouts of the alphanumeric zone of the alphanumeric section Part 4: Numeric section Part 5: Editing and function section Part 7: Symbols used to represe
18、nt functions Part 8: Allocation of letters to the keys of a numeric keypad Part 9: Multilingual-usage, multiscript keyboard group layouts Part 10: Conventional symbols and methods to represent graphic characters not uniquely recognizable by their glyph on keyboards and in documentation Part 11: Func
19、tionality of dead keys and repertoires of characters entered by dead keysThe following part has been withdrawn and the content has been included in ISO/IEC 9995-5: Part 6: Function sectioniv ISO/IEC 2015 All rights reservedBS ISO/IEC 9995-11:2015Information technology Keyboard layouts for office sys
20、tems Part 11: Functionality of dead keys and repertoires of characters entered by dead keys1 ScopeWithin the general scope described in ISO/IEC 9995-1, this part of ISO/IEC 9995 defines the functionality of dead keys and repertoires of characters entered by dead keys (see Clause 5).This part of ISO/
21、IEC 9995 is primarily intended for word-processing and text-processing applications.2 ConformanceThe layout of a keyboard conforms to this part of ISO/IEC 9995 if it contains any dead keys and if every dead key contained in this layout works as described in Clause 5. The contents of the Table 1 and
22、Table 2 only need to be complied with for such dead keys which are actually contained in the keyboard layout.3 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the editi
23、on cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO/IEC 9995-1, Information technology Keyboard layouts for text and office systems Part 1: General principles governing keyboard layoutsISO/IEC 10646, Information technology Un
24、iversal Coded Character Set (UCS)4 Terms and definitionsFor the purposes of this part of ISO/IEC 9995, the terms and definitions given in ISO/IEC 9995-1 apply.In addition, the following terms and definitions apply.4.1dead keykey which, when it is actuated, produces (according to the currently active
25、 group and level) a specific graphic character but does not change the active position.Note 1 to entry: When a key does not act as a dead key with all possible group/level combinations of a specific keyboard layout, it is called “acting as a dead key” under the precondition that a group/level combin
26、ation is active where it acts according to the definition of a “dead key” given here.Note 2 to entry: The name “dead key” originates in the naming of comparable keys present on mechanical typewriters, which did not cause a horizontal advancement of the carriage as the keys used for typing ordinary l
27、etters did.INTERNATIONAL STANDARD ISO/IEC 9995-11:2015(E) ISO/IEC 2015 All rights reserved 1BS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E)4.2peculiar charactergraphic character listed in ISO/IEC 10646, which can be entered as a sequence of a combining character (as defined in that standard) and anot
28、her character, without being the result of a canonical composition of these characters (according to Unicode normalization form C)5 Functionality of dead keys, and relation to “combining characters” as defined in ISO/IEC 10646The actuation of a dead key selects a graphic character, which, by the fac
29、t that the active position is not changed, shares its position with the graphic character entered subsequently. The outcome usually resembles an overlay of the graphic character entered by the dead key and the one entered by the subsequent keys. By entering sequences of dead keys, the result may be
30、an overlay of more than two graphic characters.This standard identifies in 5.2 and 5.3 characters which represent such results where a physical overlay is not appropriate, by enumerating single characters or special combinations of characters by identifying these by their code points given in ISO/IE
31、C 10646, for such dead keys which are associated with “combining characters” as defined in that standard.NOTE This implies that dead keys usually are associated with diacritical marks, to produce an accented character by entering the basic letter subsequently.5.1 Handling of dead keys in environment
32、s using ISO/IEC 10646NOTE 1 A characteristic of ISO/IEC 10646, unlike e.g. ISO/IEC 6937, is that combining characters are inserted into the text stream after the basic character to which they apply, thus reverting the input sequence given by dead keys.In environments using ISO/IEC 10646, the functio
33、n of dead keys is outlined by the following algorithm:Step 1. If a combining character is entered by a dead key, it is buffered by the keyboard functional unit (KFU; i.e. the responsible combination of hardware/ firmware/driver software/etc.).Step 2. If a character is entered while the KFU is buffer
34、ing characters, proceed as follows:Step 2.1 If a backspace” is entered while the KFU is buffering characters and if this backspace” does not cancel the selection of a group or a level, the buffered character sequence is dropped, and the buffering stops.Step 2.2 Otherwise, if the combination of the l
35、ast character previously buffered and the newly entered character is enumerated in Tables 1 and 2 of this standard, or any additional table contained in the definition of the keyboard layout, the last buffered character is replaced by the result character from the list.Step 2.3 Special case: This st
36、ep only applies if the definition of a keyboard layout specifies a “combining character application character”. If this character is entered, the buffered sequence is output unchanged (without the “combining character application character” itself), and the buffering stops.NOTE 2 According to ISO/IE
37、C 10646, this means that the buffered combining character, or the sequence of such, is applied to the character entered previously.NOTE 3 It is recommended to select the full stop as the “combining character application character”.Step 2.4: Otherwise, the newly entered character is appended to the s
38、equence of buffered characters.Step 3: If the last character in the buffered sequence is no longer a combining character, proceed as follows:Step 3.1: The last character in the buffered character sequence is moved to the beginning of this sequence.Step 3.2: The Unicode normalization form C (canonica
39、l composition) is applied to the the buffered sequence.Step 3.3: The resulting character sequence is output, and the buffering stops.2 ISO/IEC 2015 All rights reservedBS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E)5.2 Combinations of dead keys with the Space characterIn environments using ISO/IEC 106
40、46, dead keys followed by a space result in the entering of a spacing clone of the combining character associated with the dead key, if such one is defined in ISO/IEC 10646.However, if an “alternative resulting character” is specified in the 3rd column of Table 1, this is to be used rather than the
41、spacing clone specified in the second column of Table 1: if this “alternative resulting character” is not associated to any key directly in the keyboard layout definition, or also, if the dead key is specified in the keyboard layout definition by the inclusion of a “common secondary group layout” as
42、 defined in ISO/IEC 9995-3.For combining characters where is no such spacing clone, the definition of a keyboard layout may list specific characters which are to be used instead.Whenever a dead key is entered following by a space where neither ISO/IEC 10646 specifies a spacing clone, nor the definit
43、ion of the keyboard layout lists a specific character, the result is a space followed by the combining character, according to section 5.1.The following Table 1 lists all combining characters contained in the character collection MLS (Multilingual Latin Subset) as specified in ISO/IEC 10646, togethe
44、r with the according spacing clones or similar characters if applicable.Table 1 Diacritical marks in MLS:Name of the combining character Name of spacing clone (resulting char-acter when applied to Space)Name of the alternative resulting characterU+0300 combining grave accent U+02CB modifier letter g
45、rave accent U+0060 grave accentU+0301 combining acute accent U+02CA modifier letter acute accent U+00B4 acute accentU+0302 combining circumflex accent U+02C6 modifier letter circumflex accent U+005E circumflex accentU+0303 combining tilde U+02DC small tilde U+007E tildeU+0304 combining macron U+02C9
46、 modifier letter macron U+00AF macronU+0306 combining breve U+02D8 breveU+0307 combining dot above U+02D9 dot aboveU+0308 combining diaeresis U+00A8 diaeresisU+0309 combining hook aboveU+030A combining ring above U+02DA ring aboveU+030B combining double acute accentU+02DD double acute accentU+030C c
47、ombining caron U+02C7 caronU+030D combining vertical line above U+02C8 modifier letter vertical lineU+030E combining double vertical line aboveU+030F combining double grave accentU+0310 combining candrabinduU+0311 combining inverted breveU+0313 combining comma above U+02BC modifier letter apostrophe
48、U+0315 combining comma above rightU+031B combining horn ISO/IEC 2015 All rights reserved 3BS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E)Name of the combining character Name of spacing clone (resulting char-acter when applied to Space)Name of the alternative resulting characterU+0323 combining dot be
49、lowU+0324 combining diaeresis belowU+0325 combining ring belowU+0326 combining comma belowU+0327 combining cedilla U+00B8 cedillaU+0328 combining ogonek U+02DB ogonekU+0329 combining vertical line below U+02CC modifier letter low vertical lineU+032D combining circumflex accent belowU+A788 modifier letter low circumflex accentU+032E combining breve belowU+0331 combining macron below U+02CD modifier letter low macronU+0332 combining low lineU+0335 combining short stroke over-layU+2212 minus signU+0338 combining long solidus o
