I was peeping in the "Miscellaneous Mathematical Symbols-B" block proposed
for Unicode 3.2 (http://www.unicode.org/charts/draftunicode32/U32-2980.pdf),
when I noticed that many of those character could have been composed using
an existing base character and an existing non spacing mark.
For instance:
- 29B1..29B4 (empty sets) could be composed using various diacritics (0305,
030A, 20D6, 20D7);
- 29B5..29C3 (circle symbols) could be composed using 20DD (COMBINING
ENCLOSING CIRCLE)
- 29C4..29C8 (square symbols) could be composed using 20DE (COMBINING
ENCLOSING SQUARE)
- 29CC (triangle symbols) could be composed using 20E4 (a new combining
encoding triangle, also in 3.2:
http://www.unicode.org/charts/draftunicode32/U32-20D0.pdf)
But they don't have any compatibility decomposition. And this is also true
for all existing symbols that could be composed with diacritics. What is the
rationale for this choice?
_ Marco
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