Ideographic Description Characters (Unicode block)
Ideographic Description Characters is a Unicode block containing graphic characters used for describing CJK ideographs. They are used in Ideographic Description Sequences (IDS) to provide a description of an ideograph, in terms of what other ideographs make it up and how they are laid out relative to one another.[3] An IDS provides the reader with a description of an ideograph that cannot be represented properly, usually because it is not encoded in Unicode; rendering systems are not intended to automatically compose the pieces into a complete ideograph, and the descriptions are not standardized.
| Ideographic Description Characters | |
|---|---|
| Range | U+2FF0..U+2FFF (16 code points) |
| Plane | BMP |
| Scripts | Common |
| Assigned | 12 code points |
| Unused | 4 reserved code points |
| Source standards | GB 2312-80 |
| Unicode version history | |
| 3.0 | 12 (+12) |
| Note: [1][2] | |
Block
| Ideographic Description Characters[1][2] Official Unicode Consortium code chart (PDF) | ||||||||||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F | |
| U+2FFx | ⿰ | ⿱ | ⿲ | ⿳ | ⿴ | ⿵ | ⿶ | ⿷ | ⿸ | ⿹ | ⿺ | ⿻ | ||||
| Notes | ||||||||||||||||
History
The following Unicode-related documents record the purpose and process of defining specific characters in the Ideographic Description Characters block:
| Version | Final code points[lower-alpha 1] | Count | UTC ID | L2 ID | WG2 ID | IRG ID | Document |
|---|---|---|---|---|---|---|---|
| 3.0 | U+2FF0..2FFB | 12 | X3L2/95-111 | N1284 | Ideographic Structure Symbol (additional request), 1995-11-07 | ||
| N1303 (html, doc) | Umamaheswaran, V. S.; Ksar, Mike (1996-01-26), "8.13 Ideographic structure symbols", Minutes of Meeting 29, Tokyo | ||||||
| N1348 | Ideographic Components and Composition Scheme, 1996-02-05 | ||||||
| N1357 | Revised Ideographic Structure Symbols, 1996-04-12 | ||||||
| N1353 | Umamaheswaran, V. S.; Ksar, Mike (1996-06-25), "9", Draft minutes of WG2 Copenhagen Meeting # 30 | ||||||
| L2/97-026 | N1494 | IRG proposal: Ideographic structure character, 1996-06-27 | |||||
| N1430 | N365 | Proposal Summary Form: Ideographic Structure Character, 1996-08-01 | |||||
| N1453 | Ksar, Mike; Umamaheswaran, V. S. (1996-12-06), "9.6 Ideographic Structure Characters", WG 2 Minutes - Quebec Meeting 31 | ||||||
| L2/97-023 | N1486 | N437 | IRG #8 Resolutions, 1997-01-16 | ||||
| N1489 | Supplement to Ideographic Components and Composition Schemes, 1997-01-16 | ||||||
| N1490 | N436 | Response to WG2 question on Ideographic Structure Characters, 1997-01-16 | |||||
| L2/97-030 | N1503 (pdf, doc) | Umamaheswaran, V. S.; Ksar, Mike (1997-04-01), "9.6", Unconfirmed Minutes of WG 2 Meeting #32, Singapore; 1997-01-20--24 | |||||
| L2/97-114 | N1544 (html, doc) | N453 | Sato, T. K. (1997-04-08), Questions on the "Han structure method" described in WG2 N1490 (IRG N436) | ||||
| L2/97-255R | Aliprand, Joan (1997-12-03), "4.B.2 Ideographic Structure Characters", Approved Minutes - UTC #73 & L2 #170 joint meeting, Palo Alto, CA - August 4-5, 1997 | ||||||
| N1680 | Project Sub-Division Proposal on Scheme of Ideograph Description Sequence, 1997-12-18 | ||||||
| N1782 | Clause X Ideographic Description Sequence (IDS) – IRG N575, 1998-05-06 | ||||||
| L2/98-158 | Aliprand, Joan; Winkler, Arnold (1998-05-26), "SC2 SC2 Action re Ideographic Description Sequences", Draft Minutes - UTC #76 & NCITS Subgroup L2 #173 joint meeting, Tredyffrin, Pennsylvania, April 20-22, 1998 | ||||||
| N1842 | Proposed text for a Draft for amendment 28 - Ideographic Description Sequences, 1998-06-03 | ||||||
| L2/98-286 | N1703 | Umamaheswaran, V. S.; Ksar, Mike (1998-07-02), "9.5", Unconfirmed Meeting Minutes, WG 2 Meeting #34, Redmond, WA, USA; 1998-03-16--20, The original proposal was to use character composition. It has changed from being composition to description over its three year development. | |||||
| L2/98-317 | N1892 (pdf, doc) | Combined CD registration and consideration ballot on WD for 10646-1/Amd. 28, AMENDMENT 28: Ideographic description characters, 1998-10-22 | |||||
| L2/99-010 | N1903 (pdf, html, doc) | Umamaheswaran, V. S. (1998-12-30), "10.3", Minutes of WG 2 meeting 35, London, U.K.; 1998-09-21--25 | |||||
| L2/99-072.1 | N1971 | Irish Comments on SC 2 N 3186, 1999-01-19 | |||||
| L2/99-072 | N1970 (html, doc) | Summary of Voting on SC 2 N 3186, PDAM ballot on WD for 10646-1/Amd. 28: Ideographic description characters, 1999-02-05 | |||||
| N2023 | Paterson, Bruce (1999-04-06), FPDAM 28 Text - Ideographic Description Characters | ||||||
| L2/99-120 | Text for FPDAM ballot of ISO/IEC 10646, Amd. 28 - Ideographic description characters, 1999-04-07 | ||||||
| UTC/1999-014 | Jenkins, John (1999-06-01), Recursion depth limit for IDC's | ||||||
| UTC/1999-015 | Whistler, Ken (1999-06-01), Re: Brief note on length of ideograph descriptions | ||||||
| UTC/1999-020 | Jenkins, John (1999-06-04), Diagram and language [for Ideograph Description Sequences] | ||||||
| L2/99-176R | Moore, Lisa (1999-11-04), "Recursion Limit for Ideographic Description Characters", Minutes from the joint UTC/L2 meeting in Seattle, June 8-10, 1999 | ||||||
| L2/99-232 | N2003 | Umamaheswaran, V. S. (1999-08-03), "6.1.2 PDAM28 - Ideographic Description Characters", Minutes of WG 2 meeting 36, Fukuoka, Japan, 1999-03-09--15 | |||||
| L2/99-253 | N2067 | Summary of Voting on SC 2 N 3312, ISO 10646-1/FPDAM 28 - Ideographic description characters, 1999-08-19 | |||||
| L2/99-301 | N2123 | Disposition of Comments Report on SC 2 N 3312, ISO/IEC 10646-1/FPDAM 28, AMENDMENT 28: Ideographic description characters, 1999-09-20 | |||||
| L2/99-302 | N2124 | Paterson, Bruce (1999-09-24), Revised Text for FDAM ballot of ISO/IEC 10646-1/FDAM 28, AMENDMENT 28: Ideographic description characters | |||||
| L2/00-010 | N2103 | Umamaheswaran, V. S. (2000-01-05), "6.4.3", Minutes of WG 2 meeting 37, Copenhagen, Denmark: 1999-09-13--16 | |||||
| L2/00-045 | Summary of FDAM voting: ISO 10646 Amd. 28: Ideographic description characters, 2000-01-31 | ||||||
| L2/02-221 | N2480 | Cook, Richard (2002-05-18), Proposal to add Ideographic Description Characters (IDC) to the UCS | |||||
| L2/02-436 | N2534 | N955 | IRG Radical Classification, 2002-11-21 | ||||
| L2/12-087 | Proposed Changes to ISO/IEC 10646 Annex I, Ideographic Description Characters, 2012-02-09 | ||||||
| L2/12-007 | Moore, Lisa (2012-02-14), "Consensus 130-C13", UTC #130 / L2 #227 Minutes, Submit L2/12-087 on extensions to ideographic description sequences to WG2. | ||||||
| L2/15-065 | Jenkins, John (2015-02-02), Proposal to Add IDS Links to Online Unihan Database | ||||||
| L2/15-070 | Davis, Mark (2015-02-03), IDS in Unihan | ||||||
| L2/15-313 | Lunde, Ken (2015-11-03), Request for IDS Data | ||||||
| |||||||
Ideographic Description Sequences
IDS := Ideographic | Radical | CJK_Stroke | Private Use | U+FF1F | IDS_BinaryOperator IDS IDS | IDS_TrinaryOperator IDS IDS IDS
CJK_Stroke := U+31C0 | U+31C1 | ... | U+31E3
IDS_BinaryOperator := U+2FF0 | U+2FF1 | U+2FF4 | U+2FF5 | U+2FF6 | U+2FF7 | U+2FF8 | U+2FF9 | U+2FFA | U+2FFB
IDS_TrinaryOperator:= U+2FF2 | U+2FF3
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References
- "Unicode character database". The Unicode Standard. Retrieved 2016-07-09.
- "Enumerated Versions of The Unicode Standard". The Unicode Standard. Retrieved 2016-07-09.
- IDS are described in chapter 18.2 of the Unicode Standard 9.0 on pages 689 through 692.
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