CLDR ticket #10898: addition of content

[Marcel Schneider via CLDR-Users]

Iʼve summed up the rationale of using a dead-key based group selector 
in a new comment on ticket #10898:

https://unicode.org/cldr/trac/ticket/10898#comment:6

We know that ISO/IEC 9995 is widely disregarded by the industry, but 
the point in using such a group selector clearly exceeds what pertains 
to that standard. 

Generic dead keys are used also on layouts not conforming to ISO 9995. 

Mapping the generic group selector on AltGr/Option + Space is unrelated 
to any standard yet, but is actually proposed as the most straightforward
and interoperable (and intuitive) solution.

Any feedback is welcome. Please feel free to comment directly on the 
ticket (and the other related ticket #10851) likewise.

Regards,

Marcel