ISO/IEC INTERNATIONAL STANDARD 14651 Sixth edition 2020-12 Information technology International string ordering and comparison Method for comparing character strings and description of the common template tailorable ordering Technologies de I'information - Classement international et comparaison de chaines de caracteres - - Méthode de comparaison de chaines de caracteres et description du modele commun et adaptable d'ordre de classement Reference number IS0/IEC 14651:2020(E) IEC Tso @IS0/IEC 2020 IS0/IEC2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may on the internet or an intranet, without prior written permission. Permission can be requested from either Iso at the address beloworIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland i @IS0/IEC2020-Allrightsreserved Contents Page Foreword ..iv Introduction ..V 1 Scope. 1 2 Normative references 3 Terms and definitions 4 Symbols and conventions ..3 5 Conformance. .3 .4 6 String comparison 6.1 Preparation of character strings prior to comparison .4 6.2 .5 Key building and comparison. Preliminary considerations 6.2.1 .5 6.2.2 Reference ordering key formation. .6 6.2.3 Reference comparison method for ordering character strings .8 6.2.4 Key ordering definition 6.3 Common Template Table: Formation and interpretation .10 6.3.1 General 10 6.3.2 BNF syntax rules for the Common Template Table in Annex A 10 6.3.3 Well-formedness conditions .12 ..13 6.3.4 Interpretation of tailored tables 6.3.5 Evaluation of weight tables. .15 6.3.6 Conditions for considering specific table equivalences .15 Conditions for results to be considered equivalent. ..15 6.3.7 6.4 Declaration of a delta. .15 6.5 Name of the Common Template Table and name declaration .17 ..18 Annex A (normative) Common Template Table .20 Annex B (informative) Example tailoring deltas ..29 Annex C (informative) Preparation Annex D (informative) Tutorial on solutions brought by this document to problems of ..45 lexical ordering ..49 Annex E (informative) Searching and fuzzy matches Bibliography .51 iii IS0/IEC2020-Allrightsreserved