It has already been done: http://www.rfc-editor.org/rfc/rfc97.pdf PDF is an ISO standard, and the RFC Editor has already set a precedent by using this format when they are unable to locate an electronic copy of a very old RFC. This seems like a fine format to capture images, pictures, glyphs, and other such things that are difficult to render in ASCII. No hats on, Russ _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf