Within the set of character set standards there are two generic code structures, that defined by ISO/IEC 2022 for 7 and 8 bit transport mechanisms and that defined by the new ISO 10646 for a multi-octet transport mechanism. This part of ISO/IEC ISP 12070 is concerned with the ISO/IEC 2022 code structure.
This part of ISO/IEC ISP 12070 is applicable in the following cases:
a) the use of ASN.1 type GeneralString
b) the use of ASN. 1 type GraphicString
c) the use of ASN. 1 type TeletexString
d) the use of non-ASN.1 character strings (e.g. when a character string is embedded in the ASN.1 OCTET STRING as in ODA)
In many instances the requirements of this part of ISO/IEC ISP 12070 apply to all of these cases but where there are specific requirements applying to particular cases, these are highlighted separately.
This part of ISO/IEC ISP 12070 lays down requirements so that a consistent approach may be taken when specifying the use of coded character sets in functional standards.
Some specifications relate to "pass-through" services (e.g. MHS and Directory). Such services are outside the scope of this part of ISO/IEC ISP 12070.
Requirements for the use of character sets in Telematic services (eg Teletex and Videotex) are outside the scope of this part of ISO/JEC ISP 12070.
The requirements specified in part of ISO/IEC ISP 12070 specifically apply to Western Europe but may be applicable in other regions of the world.