Re: trying to understand the relationship between the Version 1 Hangul syllables and the later versions'

From: Ken Whistler <>
Date: Wed, 24 Jun 2015 13:20:20 -0700

No, there were in fact round-trip mappings defined (and used)
at the time. See, e.g.:

which shows the Unicode 1.1 <--> KS C 5601-1987 mappings for
the old range of Unicode 1.1 Hangul syllables 3400..3D2D.

shows the updated mappings for the complete johab set for Unicode 2.0
to an EUC encoding of KS C 5601-1992.

I'm not sure about the details of the implementation of KS C 5657-1991.
Somebody more familiar with the churn in Korean standards from
the early 1990's might know, however.


On 6/24/2015 1:03 PM, Karl Williamson wrote:
> On 06/19/2015 04:12 PM, Ken Whistler wrote:
>> The Unicode 2.0 set of 11,172 was known as the "Johab" set from KS C
>> 5601-1992.
>> That was an algorithmically designed replacement of the earlier sets
>> from
>> Korean standards -- designed to cover all modern syllables
>> algorithmically,
>> by putting all the combinations of initial, medial and final jamos in a
>> defined
>> alphabetical order, whether or not each syllable that resulted was
>> actually
>> attested in modern Korean use or not.
> Does this mean the original 2 standards (KS C 5601-1987 and KS C
> 5657-1991) fell into disuse (or perhaps never were actually used) so
> there was no need to map the new code points to them (hence no
> round-trip defined)?
Received on Wed Jun 24 2015 - 15:21:35 CDT

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