GB/T 2311-2000 in English

本标准规定了为字符集编码所提供的8位代码和7位代码的结构。

Scope

This standard specifies the structure of 8-bit codes and 7-bit codes provided for character set encoding. The code elements used in the structure are common between 8-bit codes and 7-bit codes. The code uses a variety of techniques to extend its basic 8-bit code and 7-bit code capabilities. Since 8-bit codes are now more widely used, this edition places more emphasis on 8-bit codes than previous editions. The use of common elements in both 8-digit codes and 7-digit codes enables an easy and direct conversion of any element indicated to be consistent with an 8-digit code to the corresponding 7-digit code, and vice versa. GB/T 11383 is consistent with the 8-digit code structure in this standard, and GB/T 1988 is consistent with the 7-digit code structure in this standard. The code structure conditions specified in this standard include various methods of expanding the number of graphic characters and control functions available in the code. They also include techniques for establishing and forming definitions of specific codes, and for providing coded identities for the structure and constituent elements of those specific codes. The specific code can also be identified by the object identifier of GB/T 16262. Appendix A specifies the form of object identifiers. According to GB/T 12054, the individual character sets and control functions used for these 8-bit and 7-bit codes shall be registered in the registry of coded character sets using escape sequences (see Appendix B). The registry contains details of the character sets and control functions involved and their coded representations, as well as the coded identifiers associated with those character sets. The principles established by this standard can be used to form auxiliary code structure conditions. For example, GB/T 5261 followed this step to formulate parameterized control functions. The use of a uniform structure for the 8-bit and 7-bit codes specified here has the following advantages: - permits the use of uniform terms for the code structure in the design of information processing systems; - provides a standardized method for calling agreed character sets into use; - allow data exchange between environments using 8-bit and 7-bit codes respectively; - reduce the risk of conflicts between systems requiring interoperability. When two implementation-level systems with different code structure conditions need to communicate with each other, they can do so by using code structure conditions common to both systems. The code specified here is designed for forward sequential processing of data. These codes are intended to be processed in other ways, or are included in data in a fixed-length record processing format, may have undesirable results, or may require additional special processing to ensure accurate interpretation.