I think IGES may be closer to an http hyperlinking
capability than CGM is. IGES, a widely used standard
for CAD file exchange, is also in the process of being
registered as a MIME type. I don't know if there are any
PD IGES browsers on the way, but there are several commercial
ones (which probably don't yet handle http hyperlinking).
> The real problem is not HTML, but implementation of modular browsers.
... or just other browsers with http linking capability,
which can "interoperate" with HTML browsers.
--Steve Waterbury.
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"Sometimes you're the windshield; sometimes you're the bug."
- Knopfler