标准编号：ISO/IEC 10646:2017
中文名称：信息技术 通用编码字符集（UCS）
英文名称：Information technology — Universal Coded Character Set (UCS)
发布日期：2017-12
标准范围
This International Standard specifies the Universal Coded Character Set (UCS). It is applicable to the represen-tation, transmission, interchange, processing, storage, input, and presentation of the written form of the lan-guages of the world as well as of additional symbols.
This International Standard
• specifies the architecture of this International Standard,
• defines terms used in this International Standard,
• describes the general structure of the UCS codespace,
• specifies the Basic Multilingual Plane (BMP) of the UCS,
• specifies supplementary planes of the UCS: the Supplementary Multilingual Plane (SMP), the Supplemen-tary Ideographic Plane (SIP), the Tertiary Ideographic Plane (TIP), and the Supplementary Special-purpose Plane (SSP),
• defines a set of graphic characters used in scripts and the written form of languages on a world-wide scale,
• specifies the names for the graphic characters and format characters of the BMP, SMP, SIP, TIP, SSP and their coded representations within the UCS codespace,
• specifies the coded representations for control characters and private use characters,
• specifies three encoding forms of the UCS: UTF-8, UTF-16, and UTF-32,
• specifies seven encoding schemes of the UCS: UTF-8, UTF-16, UTF-16BE, UTF-16LE, UTF-32, UTF-32BE, and UTF-32LE,
• specifies the management of future additions to this coded character set.
The UCS is an encoding system different from that specified in ISO/IEC 2022. The method to designate UCS from ISO/IEC 2022 is specified in 12.2.
A graphic character will be assigned only one code point in the standard, located either in the BMP or in one of the supplementary planes.
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