Doug Ewell scripsit:

> CGJ + COMBINING DIAERESIS is a hack, but then again the need to draw a
> distinction between the exact same combining mark used for two different
> phonetic purposes is a bit of a hack too.

However, there used to be typographical distinctions in certain German
fonts between umlaut and diaeresis: see the examples on p. 15 of Victor
Gaultney's paper "Problems of diacritic design for Latin script text
faces" at http://www.sil.org/~gaultney/ProbsOfDiacDesignLowRes.pdf
(warning: 1.4M), particularly Figure 39.

> The alternative proposed by DIN, creating a new COMBINING UMLAUT
> character, would have caused *unprecedented and catastrophic*
> equivalence and normalization problems.

Indeed.

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