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Defect Report Number: 8632-1/030

 

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Submitter: Moeller

 

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Addressed to: JTC1/SC 24/WG 6 Rapporteur Group on ISO/IEC 8632, CGM

 

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WG secretariat: NNI

 

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Date Circulated by WG secretariat: 1 July 1994

 

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Deadline on response from editor: : 1 October 1994

 

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Defect Report concerning IS 8632:1992 Computer Graphics: Metafile for the storage and transfer of picture description information (CGM) Part 1, Functional

specification.

 

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Qualifier (e.g. error, omission, clarification required): Clarification.

 

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References in document (e.g. page, clause, figure and/or table numbers):

p 17,18,132, clause 4.3.4.3, 5.3.14

 

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Nature of defect (complete, concise explanation of the perceived problem):

 

Character set versions are not handled in CGM. This facility was added to
ISO 2022:1986 and CGM should be capable of handling it.

 

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Solution proposed by the submitter (optional):

As CGM: 1992 refers explicitely to ISO 2022: 1986 I believe that we should have a defect report which

  1. adds a new subclause 4.3.4.6 entitled "Revision of character sets"
  2. modifies subclause 5.3.14, in that the second parameter is simply renamed, so that it can contain a designating escape sequence but also, in addition, a preceding version escape sequence.

 

As the version escape sequence is NOT required, existing metafiles will remain valid!

 

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Editor's response (any material proposed for processing as a technical corrigendum to, an amendment to, or a commentary on the International Standard or DIS final text is attached separately to this completed report):

Insert new clause, 4.3.4.6 Revision of character sets

 

ISO 2022:1986 allows for the revision of character sets. It states " ESC 2/6 F, when used, shall immediately precede a designating escape sequence and indicate a revision of a registered set. F will specify the revision number 1 to 63 by taking values 4/0 to 7/14 respectively. Revisions are only permitted to add a character or characters to a set and shall be submitted to the Registration Authority as required by ISO 2375, pointing out that the submission is a revision of a registered set."

 

In clause 5.3.14,change the second parameter "designation sequence tail" to "character set designation" In 3rd para, first sentence change "designation sequence tail" to "character set designation" and replace last sentence with "The character set designation consists of, optionally the character set revision sequence, and the designation sequence tail. The character set revision escape sequence, if present, is indicated by <ESC> 2/6 F, where F specifies the revision number 1 to 63 by taking values 4/0 to 7/14 respectively. The designation sequence tail consists of the character or characters that forms the "tail end" of such designating escape sequences for that character set.