GB/T 13000-2025Information technology - Universal coded character set(UCS) (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents".

This document replaces GB/T 13000-2010 "Information Technology Universal Multiple-Octet Coded Character Set (UCS)" and GB/T 13000-Compared with 2010, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Added the provisions for the Third Ideographic Plane (TIP), three encoding forms of UCS and seven encoding schemes in the scope (see Chapter 1);

b) Some of the terms and definitions have been modified (see Chapter 3, Chapter 4 of the 2010 edition);

c) The provisions on information exchange conformity (see 4.2, 2.2 of the 2010 edition) and equipment conformity (see 4.3, 2.3 of the 2010 edition) have been changed;

d) Added a chapter on "Electronic Data Annexes" (see Chapter 5);

e) Changed the scope of the UCS code space and added the Third Ideographic Plane (TIP) to the overall structure of UCS (see 6 Chapter 7.1 of the 2010 edition, Chapter 5, 6.1);

f) Changed the character encoding format (see 7.2, 6.2 of the 2010 edition), deleted the eight-bit order (see 6.3 of the 2010 edition), added the code type specification (see 7.3), and changed the format of the code short identifier (UID) (see 7.6, 2010 edition) 6.5 of the 2011 edition), added the provisions for eight-bit sequence identifiers (see 7.8);

g) Added a chapter on "UCS encoding format" (see Chapter 10);

h) Added a chapter on "UCS Coding Scheme" (see Chapter 11);

i) Deleted the chapter "Level of Implementation" (see Chapter 14 of the 2010 edition);

j) Added the UCS encoding scheme identifier (see 13.2), and deleted the identifier of the UCS encoding representation with implementation level (see 16.2 of the 2010 edition);

k) The provisions on mirror characters have been changed (see Chapter 16, Chapter 19 and Appendix E of the 2010 edition);

l) Added the provisions of ideographic character descriptors (see 17.5), variant selectors and variant selector sequences (see 17.6);

m) Added the rules for combination categories and regular order (see 21.2) and combination grapheme connectors (see 21.7);

n) added unique spelling rules for the scripts of India and some South Asian countries (see 23.2) and etymological references for graphic symbols (see 23.4);

o) Added the CJK Chinese character etymology standard classification (see 24.1), changed the etymology reference list (see 24.1.2010 version 27.1), added Added CJK Chinese character etymology reference file (see 24.2), CJK unified Chinese character etymology reference information representation method (see 24.3), CJK compatible Chinese character etymology reference information representation method (see 24.4);

p) Added "Etymology of Xixia characters", "Etymology of Nüshu characters", "Character names and notes" and "Named UCS sequence "Recognition of Symbols" (see Chapters 25, 26, 27, and 28);

q) New languages have been added (see Chapter 29, Chapter 30, Chapter 31 and Chapter 33);

r) Added a chapter on "The Structure of the Third Ideographic Plane (TIP)" (see Chapter 32);

s) The code table, character name list and character source have been changed (see Chapter 34, Chapter 33 of the 2010 edition);

t) The list of graphic character sets used for subsets has been changed (see Appendix E, Appendix A of the 2010 edition).

This document is modified to adopt ISO/IEC 10646:2020 "Universal Coded Character Set (UCS) for Information Technology" and ISO/IEC 10646:2020/Amd1.2023.

This document has the following structural adjustments compared to ISO/IEC 10646:2020 and ISO/IEC 10646:2020/Amd1.2023.

--- To avoid the occurrence of suspended sections, 27.5.1, G.1, I.1, I.2.3.1 and I.2.4.1 are added, and the number of the following chapters is postponed in sequence;

--- Note 2 of 34.1 corresponds to Appendix M in ISO/IEC 10646:2020;

--- Note 4 of 34.2 corresponds to Appendix Q in ISO/IEC 10646:2020;

--- Appendix A corresponds to Appendix U in ISO/IEC 10646:2020;

--- Appendix B corresponds to Appendix N in ISO/IEC 10646:2020;

--- Appendix C corresponds to Appendix K in ISO/IEC 10646:2020;

--- Appendix D corresponds to Appendix J in ISO/IEC 10646:2020;

--- Appendix E corresponds to Appendix A in ISO/IEC 10646:2020;

--- Appendix F corresponds to Appendix G in ISO/IEC 10646:2020;

--- Appendix G corresponds to Appendix F in ISO/IEC 10646:2020;

--- Appendix H corresponds to Appendix I in ISO/IEC 10646:2020, which adds H.2.1 and H.2.2;

--- Appendix I corresponds to Appendix S in ISO/IEC 10646:2020;

--- Appendix J corresponds to Appendix L in ISO/IEC 10646:2020;

--- Appendix K corresponds to Appendix R in ISO/IEC 10646:2020;

--- Appendix M corresponds to Appendix P in ISO/IEC 10646:2020;

--- Appendix N corresponds to 34.5 in ISO/IEC 10646:2020;

--- Deleted Annex B, Annex C, Annex D, Annex E, Annex H and Annex T of ISO/IEC 10646:2020.

The technical differences between this document and ISO/IEC 10646:2020 and ISO/IEC 10646:2020/Amd1.2023 and their reasons are as follows.

--- Moved the supplementary content of the entity name formation rules applicable to non-English versions from the notes to the main text to comply with the national standard drafting rules;

--- Deleted the contents of the abolished documents or standards and explained them with footnotes to comply with the national standard drafting rules;

--- Changed the inaccurate standard numbers cited in international standards and explained them with footnotes to comply with the national standard drafting rules;

Other new additions are consistent with ISO/IEC 10646:2020/Amd1.2023.

The following editorial changes were made to this document.

--- Changed the note of the term "dedicated plane" and added other commonly used translations;

--- Added notes on the use of special characters;

---Added content about CJK Chinese character recognition and sorting;

--- Added a note on the character source list, the content of which comes from Annex M of ISO/IEC 10646:2020;

--- Added a note on the query method of the Korean syllable code mapping table, the content of which comes from Appendix Q of ISO/IEC 10646:2020;

--- Added Chinese translation of block names;

--- Changed the appendix number of the referenced document in the identification related content of ASN.1 character transfer syntax;

--- Added character names that are not listed in the character name list file that are missing from ISO/IEC 10646:2020/Amd1.2023

--- Added Appendix L (informative) "Supplementary explanation of some Chinese characters and symbols";

---Added references.

1 Scope

This document.

---Specifies the architecture of UCS;

--- Defines the terms used in UCS;

---Describes the overall structure of the UCS code space;

---Specifies the UCS allocated planes. UCS Basic Multilingual Plane (BMP), Supplementary Multilingual Plane (SMP), Supplementary Ideographic Plane (SMP) the Sigmographic Plane (SIP), the Third Ideographic Plane (TIP), and the Supplementary Special Purpose Plane (SSP);

--- Defines graphic character sets for writing in various languages around the world;

---Specifies the names and encodings of graphic characters and format characters of BMP, SMP, SIP, TIP and SSP of UCS;

---Specifies the encoding of control characters and special characters;

---Specifies three encoding forms of UCS. UTF-8, UTF-16 and UTF-32;

---Specifies seven UCS encoding schemes. UTF-8, UTF-16, UTF-16BE, UTF-16LE, UTF-32, UTF-32BE and UTF-32LE;

---Specifies the management methods for future supplementary coded characters.

This document is applicable to technical products that have the function of information processing and exchange of graphic characters in various languages around the world.

Note. This document does not specify whether the characters it encodes are suitable for use as identifiers in programming languages. Appendix A gives information on characters suitable for use as identifiers.

Reference documents.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this text.

Only the version corresponding to that date is applicable to this document; for undated referenced documents, the latest version (including all amendments) is applicable to this document.

ISO/IEC 2022 Information technology character code structure and extension technology Note. GB/T 2311-2000 Information technology character code structure and extension technology (ISO/IEC 2022:1994, IDT) ISO/IEC 6429 Information technology coded character set control functions