WH/T 91-2020 in English
VALIDGuidelines for deseription of Gaiji
- Issued on:2020-09-01
- Implemented on:2021-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
| Standard No: | WH/T 91-2020 |
| Document status: | VALID |
| Title in English: | Guidelines for deseription of Gaiji |
| Title in Chinese: | 汉文古籍集外字描述规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-09-01 |
| Implemented on: | 2021-01-01 |
| ICS Classification: | 01.140-Information sciences. Publishing |
| Chinese Classification: | A14-Library, Archives, Literature and Information |
| Professional Classification: | WH-Culture |
| Related Keywords: | idc characters idc ideographic description characters
ideographic description characters chinese character components gaiji japanese idc characters gaiji introduction standard background |
| Related Topics: | How to describe the infrared peak
How to describe in the paper outlining Test English description English description foreign academician |
本标准规范了汉文古籍集外字描述的基本原则、集外字拆分流程和描述数据结构。
本标准适用于汉文古籍数字化过程中对汉字集外字描述。
Introduction
Standard Background and Significance
As the basic standard for the digitization of ancient books, WH/T91-2020 systematically stipulates the technical specifications of Ideographic Description Characters (IDC) and Ideographic Description Sequence (IDS) for the first time. The standard is based on Unicode 12.0 and clearly defines the encoding positions of 12 IDC characters (U+2FF0 to U+2FFB).
Core Terms Definition
| Term | Full English Name | Definition |
|---|---|---|
| IDS | Ideographic Description Sequence | A sequence of Chinese character structure descriptions formed by the combination of IDC characters |
| IDC | Ideographic Description Characters | 12 special characters used to describe the relationship between Chinese character components |
| Gaiji | Japanese for "rare character" | Specifically refers to difficult characters and variant characters that appear in ancient books |
Analysis of IDC Character Functions
The standard divides 12 IDC characters into three categories of functions:
- Basic combining characters (10): including ⿰(U+2FF0), ⿱(U+2FF1), ⿴(U+2FF4), etc., used to describe common Chinese character structural relationships
- Mirror combining characters (2): ⿲(U+2FF2) and ⿳(U+2FF3), used to handle special mirror structures
- Placeholder: "?"(U+FF1F) is used to represent unknown components
Typical case: The character "明" can be represented as ⿰日月, where ⿰ represents the left-right structural relationship.
IDS construction rules
Chapter 4 of the standard specifies the construction method of the IDS sequence in detail:
- The basic structure description shall not exceed 3 levels of nesting
- The mirror structure must use special characters
- Complex structures can use temporary encoding (U+FFFF0 to U+FFFF3)
Implementation suggestions
According to the requirements of Chapter 7 of the standard, the following should be noted when digitizing ancient books:
- Basic combination characters should be used to describe regular structures
- Decomposition description should be used for nested structures with more than three levels
- Difficult characters should be processed in conjunction with Unicode extension area encoding
Special case: For the character "龜", it is recommended to use the multi-layer description method of ⿳⿰⿱⿰丨一⿰丨一⿰⿰⿱⿰丨一⿰丨一⿰⿰⿱⿰丨一⿰丨一⿰⿰⿱⿰丨一⿰丨一⿰.
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