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N 435
Date : 1998-04-15
Contact 1: Secretariat ISO/IEC JTC 1/SC 2/WG 3 ELOT Mrs K.Velli (acting)
Acharnon 313, 111 45 Kato Patissia, ATHENS GREECE
Tel: +30 1 22 80 001 Fax : +30 1 22 86 219 E-mail :
kkb@elot.gr
Contact 2 : Convenor ISO/IEC JTC 1/SC 2/WG 3 Mr E.Melagrakis
Acharnon 313, 111 45 Kato Patissia, ATHENS GREECE
Tel: +30 1 22 80 001 Fax : +30 1 22 86 219 E-mail:
eem@elot.gr
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TITLE :
Use of Collection Identifiers for Identifying Sub- Repertoires of
10646
SOURCE :
USA (ANSI) and Canada
PROJECT:
JTC 1.02.16
STATUS :
Member body positions
ACTION ID :
For the consideration of WG 2 and WG 3
DUE DATE :
---
DISTRIBUTION :
P, O and L Members of ISO/IEC JTC 1/SC 2
WG Conveners, Secretariats
WG 3 Members
ISO/IEC JTC 1 Secretariat
ISO/IEC ITTF
MEDIUM :
P
NO OF PAGES :
3
,62,(&-7&6&:*
N 435
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
,62,(&-7&6&:*
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to that code position, and there is no need to replicate this information in the sub-repertoire definition.
At present, a request to ISO/IEC JTC 1/SC 2 (which will be assigned to ISO/IEC SC 2/WG 2) to issue
a collection identifier and enter that into the Annex A of the standard is all that is needed to identify
such a sub-repertoire.
The existing procedure to add a collection identifier is through a "technical amendment" to the
standard, since Annex A is a "normative" annex of the standard. Even though this procedure is more
complex and cumbersome than a simple registration procedure, it can be effectively used to handle the
requests for registration of sub-repertoires of 10646. A request for identifying a sub-repertoire can be
prepared and submitted by a member body, a liaison organization or an individual expert to SC 2, along
with some background information and rationale behind the request.
It is further proposed that the existing "technical amendment" procedure be retained as it gives the
maximum amount of filtering and control of requests for identifying sub-repertoires by ISO at the same
time being able to respond responsibly to legitimate requests.
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