[bug #60571] Footnote markers defeat end-of-sentence recognition

[Dave]

Follow-up Comment #3, bug #60571 (project groff):

[comment #2 comment #2:]
> The following remain.

And of those. Heirloom uses   

; @ j J P T U 

> I think before long we want to propose to the *roff community
> the reservation of one of the above characters for an extended
> escape syntax of much the same form as \D and \X.

That makes a great deal of sense to me.

Offhand, < seems the best candidate for a double-agent escape character /
begin delimiter, since it has an obvious companion for an end delimiter (at
the risk of maybe making roff code look a little HTMLy).

> none of the symbols in the above list have any obvious mnemonic
> value to me for the purpose the Heirloom bug submitter and I want.

Given the paucity of available letters, we may be in the Post-Mnemonic Era for
assigning new roff escapes.  Traditional Unix commands with a multitude of
single-letter command-line switches have felt this crunch as well.

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