>(I also don't quite understand the semantics of a base character followed by 
>tag characters, to say the truth.)

Page 2 of the following document is where the idea was introduced.

http://www.unicode.org/L2/L2015/15145r-add-regional-ind.pdf

The document is linked from the following page.

http://www.unicode.org/L2/L2015/Register-2015.html

William Overington

16 September 2016


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