ISO/IEC JTC/1 SC/2 WG/2 N2223R
2000-06-01

ISO/IEC JTC/1 SC/2 WG/2
Universal Multiple-Octet Coded Character Set (UCS)
Secretariat: ANSI

Title:

Beyond the request of JIS COMPATIBILITY IDEOGRAPHS revised

Doc. Type:expert contribution

Source:Takayuki K. Sato -Japan

Project:

02:18.01

Status:To be considered at #39 WG2 meeting in Greece (SEP2000)

Date:

2000-06-01

Distribution: ISO/IEC JTC/1 SC/2 WG2Reference:

WG2 N2197, Resolution M38.11

WG2 N2142, N2196, N2221R,

N2222R
Medium:Japan proposes WG2 to open the discussion on the issues described in this document.

Issue-1:

Definition of the COMPATIBILITY IDEOGRAPHS in contrast with the UNIFIED IDEOGRAPHS

in somewhere ISO/IEC 10646 is necessary:

The more people believes the CJK UNIFICATION, the more difficulty to understand an existence of theCOMPATIBILITY IDEOGRAPH, for non native user of the CJK IDEOGRAPHS in particular. Therefore it
might be better to include an explanation of both IDEOGRAPHS within the ISO/IEC 10646.

One sample of the explanation is definitions in N2196.
other ways to explain. .

Definitions in N2196 are: (for reference)

1

But, it may not be necessary to be so. It may beDefinition-1: CJK COMPATIBILITY IDEOGRAPH CJK ideograph that has to be unified with existingCJK UNIFIED IDEOGRAPH in principle. However, different code position is assigned for the CJKCOMPATIBILITY IDEOGRAPH to guarantee “ round trip conversion” between UCS and existing
national standard(s) or industrial practices.
Definition-2: CJK UNIFIED IDEOGRAPH CJK ideograph that is independent ideograph from any otherCJK UNIFIED IDEOGRAPH per the unification rule of the UCS. The unification is done by theunification rule defined in the ISO/IEC 10646.

By the way, Japan strongly request WG2 to confirm the N2196 as a guidance rule of the
COMPATIBILITY IDEOGRAPHS.

Issue-2:

Existing CJK COMPATIBILITY IDEOGRAPHS.

Since both WG2 N2142 and N2196 are requesting “ compatibility information” for the COMPATIBILITY
IDEOGRAPHS.

However, existing CJK COMPATIBILITY IDEOGRAPHS (F900-FA2D) do not havesuch an information.
There might be better to amend ISO/IEC 10646-1 by the compatibility information for those CJKCOMPATIBILITY IDEOGRAPHS.

Issue-3:Is annex P right place to amend the compatibility ideograph?

The compatibility information has two key components. One is the source standard and another is“ corresponding CJK UNIFIED IDEOGRAPH (or it’ s extension).
The source standard information is just a couple of lines of text for a group of the COMPATIBILITY
IDEOGRAPH, thus annex P might be a good place to fill in. Besides, the correspondence data mightmake the annex P too large (and not practice to use).
It is better to consider locating the corresponding data onto separated place. Some of ideas are:••To create new annex for this data orAdd parenthesized data to the character nameIssue-4: Mapping information.

To avoid the mapping data inconsistency problem.

It is better that the mapping data should be definedwithin the source standard. ISO/IEC 10646 does have only a data of the name of the source standard
for the COMPATIBILITY IDEOGRAPHS. The mapping data is only necessary for the users of the source
standard. The other users are not expected to use the COMPATIBILITY IDEOGRAPHS in principle.
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