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
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