Gives an interchange format suitable for the transfer of structured documents between equipment designed for raster processing. Documents supported by ISO/IEC ISP 15124 are based on a paradigm of an electronic engineering drawing or illustration. These documents contain one or more pages with each page consisting of a base image in the form of a bi-tonal raster graphic, character or geometric graphics content. The base image may be further annotated with character, raster or geometric graphics content.