Hi,

The following are excerpts from the mapping tables contained on the Unicode
3.0 CD for CNS-11643 and BIG5. The mapping tables are 7 years old. However
since they are on the Unicode 3.0 CD I am assuming that they are still
valid...

CNS-11643
# WARNING!  It is currently impossible to provide round-trip compatibility
#               between CNS 11643-1986 and Unicode.  
#   (1) Some characters are not currently mapped because
#         of conflicts with other mappings.  They include the following:
#
#       CNS         Description                    Comments
#       0x12224      SPACING HEAVY OVERSCORE       not in Unicode
#       0x12226      SPACING HEAVY UNDERSCORE      not in Unicode
#
The same two characters from the Big-5 table are said to be missing from
Unicode.

What the document isn't saying is how to handle round-trip compatibility to
Unicode and back to CNS-11643 (same with Big-5).  Are there any compatible
characters in Unicode to map these code points to?  If we map these
characters to the Private Use Area, we can return them to CNS-11643, but if
we display them directly in Unicode, how can we cope with the font issue?

Thanks,

Guy Lacoursière
Software Globalisation Consultant
Cognos Incorporated









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