Background:

The US member body, Canada and some other member bodies have expressed their opinion at the SC 2

- Crete meeting that for registering of sub-repertoires of ISO/IEC 10646 it should be sufficient to use

the collection identifier mechanism of 10646, and that the project proposal to expand the scope of ISO

7350 be abandoned. This paper expands on this position.

At the Crete, SC 2 meeting in July 1997, the following resolutions were taken:

RESOLUTION M 07.22 (Disposition of Comments on CD 7350, Registration of repertoires of

graphic characters from ISO/IEC 10367)

SC 2 resolves to suspend this project on 7350 Revision (see Resolution M07.28).

UNANIMOUS

RESOLUTION M 07.28 (Collection Identifiers for 10646 subsets/sub-repertoire)

With reference to WG 2 Resolution M33.31 in document N 2927, and WG 3 Resolution M12.11 in

document N 2933, SC 2 instructs WG 2, in corporation with WG 3 to prepare a proposal to cover

the requirements for Collection Identifiers for 10646 subsets and report to the next SC 2 Plenary.

SC 2 further invites National Bodies and Liaison Organizations to communicate their needs to WG

2. SC 2 invites US and Canadian National Bodies to assist WG 2 in this effort.

UNANIMOUS

Collections are defined in the latest Technical Corrigendum (COR.2) to 10646-1: 1983 (E), which was

recently balloted in SC 2 (Ref. ISO/IEC JTC 1/SC 2/WG 2 N 1664; Draft Technical Corrigendum No.2

to ISO/IEC 10646-1:1 1983 (E))

4.11: collection: A set of coded characters which is numbered and named and which consists of

those coded characters whose code positions lie within one or more identified ranges.

Note - If an of the identified ranges include code positions to which no character is allocated, the

repertoire of the collection will change if an additional character is assigned to any of those

positions at a future amendment of this International Standard.

4.17: dense collection: A collection in which every code position within the identified range(s) has

a character allocated to it.

Note - The repertoire of a dense collection can not be extended at a future amendment of this

International Standard unless one or more of the identified ranges of code positions is extended.

Annex A of 10646 lists a number of sub-repertoires of 10646. The COR.2 has marked some of these as

"dense collections" based on the definitions cited above.

Note: There is another US / Canada contribution proposing a revisiting the above definitions and

proposing removal of the part "unless one or more…" in the Note under the definition 4.17 above.

Also, note that the words "extended at a future amendment" should be changed to "extended by a future

amendment" in both the above clauses.

Sub-Repertoire of 10646 as Collections

A sub-repertoire of 10646 consists entirely of a set of coded characters defined in the standard. A

"dense collection identifier" can be assigned to any such sub-repertoire by giving it a number, a suitable

name and the list of one or more contiguous ranges of the code positions assigned to these characters in

the standard. The standard already has a listing of the code positions and names of characters assigned