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Fwd: In-Band Information Considered Harmful

I just read this on the Perl5Porters list:

From :Chip Salzenberg <chip@xxxxxxxxxxxxxxx>
> At the Conference, I was pleased to speak at length with Ted Nelson
> on many subjects, and made the point to me that one of the Xanadu
> system's best features was its total separation of markup (i.e. 
> formatting and hyperlinks) from content.  It would have allowed
> (e.g.) me to use one set of markup and (e.g.) you to use another
> set, all without duplicating or mangling the original content.  None
> of this is at all feasible with HTML/XML, which would require either
> duplicating content or commingling various independent sets of
> markup data.

Ted, what's this stuff?  (Yet Another) part of Xanadu I haven't heard
of!  Sounds GREAT from Perl's POV.