Choosing the Set of Renderable Strings

[Richard Wordingham via Unicode]

On Mon, 14 May 2018 08:55:05 +0100 (BST)
William_J_G Overington via Unicode <unicode at unicode.org> wrote:

> One possibility that might be worth consideration is to map each
> otherwise unmapped glyph in the font each to a distinct code point in
> the Private Use Area. This being as well as all of the automated
> glyph substitution, not instead of it.

That's what the Xishuangbanna News does for final consonants.  My
issues are generally not with producing the right image, but
rather with enabling the semantically correct sequence of
characters.  (It would be daft to impose phonetic order on the users
and then prohibit it piecemeal.)  I can overcome the USE, the question
is which battles the font is to fight.

Richard.