1、BSI Standards Publication BS ISO/IEC 9995-11:2015 Information technology Keyboard layouts for office systems Part 11: Functionality of dead keys and repertoires of characters entered by dead keysBS ISO/IEC 9995-11:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation
2、 of ISO/IEC 9995-11:2015. The UK participation in its preparation was entrusted to Technical Committee ICT/-/6, ICT Accessibility Co-ordination. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the nec
3、essary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 82468 5 ICS 35.180 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standar
4、d was published under the authority of the Standards Policy and Strategy Committee on 30 June 2015. Amendments issued since publication Date Text affectedBS ISO/IEC 9995-11:2015 Information technology Keyboard layouts for office systems Part 11: Functionality of dead keys and repertoires of characte
5、rs entered by dead keys Technologies de linformation Dispositions de claviers bureautiques Partie 11: Fonctionnalit des touches mortes et rpertoires de caractres entrs par touches mortes INTERNATIONAL STANDARD ISO/IEC 9995-11 Reference number ISO/IEC 9995-11:2015(E) First edition 2015-06-01 ISO/IEC
6、2015 BS ISO/IEC 9995-11:2015ii ISO/IEC 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015, Published in Switzerland All 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 mechanic
7、al, including photocopying, or posting 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 office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Swit
8、zerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/IEC 9995-11:2015(E)BS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E)Foreword iv 1 Scope . 1 2 Conformance . 1 3 Normative references 1 4 Terms and definitions . 1 5 Functionality of dead keys, and relation to “combining
9、 characters” as defined in ISO/IEC 10646 . 2 5.1 Handling of dead keys in environments using ISO/IEC 10646 . 2 5.2 Combinations of dead keys with the Space character . 3 5.3 Combinations of dead keys with other characters, yielding peculiar characters 4 ISO/IEC 2015 All rights reserved iii Contents
10、PageBS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(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 ISO or IEC participate in the de
11、velopment 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-govern
12、mental, 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 D
13、irectives, 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). Attention is drawn to the possibility that som
14、e of the elements of this document may be the subject of patent 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
15、 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 meaning of ISO specific terms and expressions related to conformity assessment, as well as inform
16、ation about ISOs adherence to the WTO principles in the Technical 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 th
17、e following parts, under the general title Information technology 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:
18、 Editing and function section Part 7: Symbols used to represent 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 b
19、y their glyph on keyboards and in documentation Part 11: Functionality of dead keys and repertoires of characters entered by dead keys The 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
20、-11:2015Information technology Keyboard layouts for office systems Part 11: Functionality of dead keys and repertoires of characters entered by dead keys 1 Scope Within the general scope described in ISO/IEC 9995-1, this part of ISO/IEC 9995 defines the functionality of dead keys and repertoires of
21、characters entered by dead keys (see Clause 5). This part of ISO/IEC 9995 is primarily intended for word-processing and text-processing applications. 2 Conformance The 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 layo
22、ut works as described in Clause 5. The contents of the Table 1 and Table 2 only need to be complied with for such dead keys which are actually contained in the keyboard layout. 3 Normative references The following documents, in whole or in part, are normatively referenced in this document and are in
23、dispensable for its application. For dated references, only the edition 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 princip
24、les governing keyboard layouts ISO/IEC 10646, Information technology Universal Coded Character Set (UCS) 4 Terms and definitions For 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. 4.1 dead ke
25、y key which, when it is actuated, produces (according to the currently active 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
26、called “acting as a dead key” under the precondition that a group/level combination is active where it acts according to the definition of a “dead key” given here. Not e 2 to ent r y : T he na me “ dead key ” or ig inat es in t he na ming of compa rable keys present on mecha nic a l t y pew r it er
27、s, which did not cause a horizontal advancement of the carriage as the keys used for typing ordinary letters did. INTERNATIONAL ST ANDARD ISO/IEC 9995-11:2015(E) ISO/IEC 2015 All rights reserved 1BS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E) 4.2 peculiar character graphic character listed in ISO/IE
28、C 10646, which can be entered as a sequence of a combining character (as defined in that standard) and another 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 chara
29、cters” as defined in ISO/IEC 10646 The actuation of a dead key selects a graphic character, which, by the fact 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 th
30、e dead key and the one entered by the subsequent keys. By entering sequences of dead keys, the result may be 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 sin
31、gle characters or special combinations of characters by identifying these by their code points given in ISO/IEC 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 p
32、roduce an accented character by entering the basic letter subsequently. 5.1 Handling of dead keys in environments using ISO/IEC 10646 NOTE 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
33、 they apply, thus reverting the input sequence given by dead keys. In environments using ISO/IEC 10646, the function 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 responsib
34、le combination of hardware/ firmware/driver software/etc.). Step 2. If a character is entered while the KFU is buffering 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 leve
35、l, the buffered character sequence is dropped, and the buffering stops. Step 2.2 Otherwise, if the combination of the last character previously buffered and the newly entered character is enumerated in Table s 1 and 2 of this st andard, or any additional t able cont ained in the def inition of the k
36、eyboard layout, the last buffered character is replaced by the result character from the list. Step 2.3 Special case: This step 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 u
37、nchanged (without the “combining character application character” itself), and the buffering stops. NOTE 2 According to ISO/IEC 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 ful
38、l stop as the “combining character application character”. Step 2.4: Otherwise, the newly entered character is appended to the sequence 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
39、in the buffered character sequence is moved to the beginning of this sequence. Step 3.2: The Unicode normalization form C (canonical 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 reservedB
40、S ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E) 5.2 Combinations of dead keys with the Space character In environments using ISO/IEC 10646, 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
41、 10646. However, if an “alternative resulting character” is specified in the 3rd column of Table 1, this is to be used rather than the 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 defin
42、ition, or also, if the dead key is specified in the keyboard layout definition by the inclusion of a “common secondary group layout” as 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
43、 used instead. Whenever a dead key is entered following by a space where neither ISO/IEC 10646 specifies a spacing clone, nor the definition 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 l
44、ists all combining characters contained in the character collection MLS (Multilingual Latin Subset) as specified in ISO/IEC 10646, together 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 (
45、resulting char- acter when applied to Space) Name of the alternative resulting character U+0300 combining grave accent U+02CB modifier letter grave accent U+0060 grave accent U+0301 combining acute accent U+02CA modifier letter acute accent U+00B4 acute accent U+0302 combining circumflex accent U+02
46、C6 modifier letter circumflex accent U+005E circumflex accent U+0303 combining tilde U+02DC small tilde U+007E tilde U+0304 combining macron U+02C9 modifier letter macron U+00AF macron U+0306 combining breve U+02D8 breve U+0307 combining dot above U+02D9 dot above U+0308 combining diaeresis U+00A8 d
47、iaeresis U+0309 combining hook above U+030A combining ring above U+02DA ring above U+030B combining double acute accent U+02DD double acute accent U+030C combining caron U+02C7 caron U+030D combining vertical line above U+02C8 modifier letter vertical line U+030E combining double vertical line above
48、 U+030F combining double grave accent U+0310 combining candrabindu U+0311 combining inverted breve U+0313 combining comma above U+02BC modifier letter apostrophe U+0315 combining comma above right U+031B combining horn ISO/IEC 2015 All rights reserved 3BS ISO/IEC 9995-11:2015ISO/IEC 9995-11:2015(E)
49、Name of the combining character Name of spacing clone (resulting char- acter when applied to Space) Name of the alternative resulting character U+0323 combining dot below U+0324 combining diaeresis below U+0325 combining ring below U+0326 combining comma below U+0327 combining cedilla U+00B8 cedilla U+0328 combining ogonek U+02DB ogonek U+0329 combining vertical line below U+02CC modifier letter low vertical line U+032D combining circumflex accent below U+A788 mod
