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TC 304 The profile ISO/IEC ISP 12070 was planned as an International Standardized Profile in multiple parts. Each part would provide requirements that may be used to ensure a consistent approach when specifying the use of coded character sets in functional standards. Since activity on OSI has now come to a halt internationally, it is unlikely that that the remaining parts will be produced.
Within the set of character set standards there are two generic code structures, that defined by ISO/IEC 2022 for 7-bit and 8-bit transport mechanisms and that defined by the new ISO/IEC 10646 for a multiple-octet transport mechanism. It was the intention to cover both of these generic code structures as future parts were prepared. Part 1 is concerned with the ISO/IEC 2022 code structure. The requirements that it specifies apply specifically to Western Europe but they may be applicable also to other regions of the world.
Abstract Syntax Notation One (ASN.1) forms part of the Presentation Layer of the OSI model. It is specified in the four-part standard ISO/IEC 8824, the current edition of which was published in 1995, replacing the second edition of 1990 that was a one-part standard. The ASN.1 standard defines a number of character string types, of which those listed above are a selection.
The last case in the list is particularly relevant for character based data streams and for this reason ISO/IEC ISP 12070-1 is included in this guide. It contains a number of specific conformance requirements which go a long way towards supporting implementation interoperability. These could be used as a checklist for developers but also as requirements to be referenced during the procurement process.