ISO/IEC 2022:1994 PDF

Name: ISO/IEC 2022:1994 — Information technology — Character code structure and extension techniques
SKU: ISO/IEC 2022:1994
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Information technology — Character code structure and extension techniques

Название (английский):

ISO/IEC 2022:1994

Information technology — Character code structure and extension techniques

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 54
Дата публикации:: 1 декабря 1994 г.
Издание:: ISO/IEC IS 2022 edition 4 version 1
ICS:: 35.040

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Описание (английский):

Cancels and replaces the third edition (1986). Specifies the structure of 8-bit codes and 7-bit codes which provide for the coding of character sets. The codes specified here are designed to be used for data that is processed sequentially in a forward direction. Use of these codes in strings of data which are processed in some other way, or which are included in data formatted for fixed-length record processing, may have undesirable results or may require additional special treatment to ensure correct interpretation.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO/IEC 2022:1994 - Information technology - Character code structure and extension techniques - defines a framework for structuring 7‑bit and 8‑bit character codes and the extension techniques used to call up additional character sets and control functions. This fourth edition (1994) replaces the 1986 edition and focuses on interoperable code elements, escape sequences, and conformance rules. The standard is intended for data processed sequentially in a forward direction and warns that other processing models (e.g., fixed‑length records or non‑sequential parsing) may require special handling.

Key topics and technical requirements

Common code elements: Defines common elements used by both 7‑bit and 8‑bit codes so an 8‑bit code can be transformed to an equivalent 7‑bit code and vice‑versa.

Character sets and control functions: Classification and formal description of graphic character sets, control function sets, combining characters, and single control functions.

S‑bit and 7‑bit code structure: Layout of code tables, invocation mechanisms for character sets, and rules for shift functions (locking and non‑locking).

Escape sequences & code identification: Syntax and semantics of escape sequences, designation functions for identifying and selecting character sets (including DRCS - dynamically redefinable character sets) and code identification functions.

Conformance and device requirements: Definitions of full and limited conformance, requirements for originating and receiving devices, and rules prohibiting use of reserved or unregistered coded values.

Transformation rules: Procedures for transforming between 8‑bit and 7‑bit representations while preserving meaning.

Code announcement & switching: Mechanisms for announcing available code structure facilities, delimiters, and designating other coding systems.

Applications and who uses it

Software and firmware developers implementing terminal emulators, text renderers, and communication stacks that must support multiple character repertoires.

Protocol designers and standards authors who need standardized escape sequences and code‑identification methods for international data interchange.

System integrators and archivists handling legacy 7‑bit/8‑bit text data to ensure correct interpretation and conversion.

Manufacturers of input/output devices (printers, terminals) and libraries managing control functions and code switching. Practical benefits include reliable multilingual interchange, interoperability between environments using 7‑bit and 8‑bit encodings, and minimized conflicts when systems interoperate.

Related standards

ISO/IEC 4873 (8‑bit code structure conforming to this standard)

ISO/IEC 646 (7‑bit code structure conforming to this standard)

ISO 2375 (registration of escape sequences)

ISO/IEC 6429 (control functions)

ISO 8824 / ISO 8825 (ASN.1 related object identifiers)

ISO/IEC 10646 (not structured according to this standard; noted in text)

Keywords: ISO/IEC 2022, character code, code structure, escape sequences, 7‑bit, 8‑bit, code extension, character sets, code identification, conformance, interoperability.

ISO/IEC 2022:1994 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO/IEC 2022:1994/Cor 1:1999

Information technology — Character code structure and extension techniques — Technical Corrigendum 1

ISO/IEC 4873:1991

Information technology — ISO 8-bit code for information interchange — Structure and rules for implementation

ISO/IEC 646:1991

Information technology — ISO 7-bit coded character set for information interchange

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