Fwd: Re: Fwd: CGM:1999 defect

[Lofton Henderson <lofton@rockynet.com>]

CGM Open members --

Attached please find the contents of a defect which I just submitted to 
SC24 for CGM:1999.  If you have any problems, comments, or correction, 
please let me know immediately.  The ISO committee is meeting this week.

If you are a user of MetaCheck, I am informed that MetaCheck 5.18 does the 
correct check, even though CGM:1999 had it specified wrong.  This is 
because MC 5.18 was being released around the time the original defect 
(8632:1992-1/065) was being processed and CGM:1999 published.  The ad hoc 
technical group got the solution right, and it went into MC correctly, but 
into the final CGM text (and defect report text) incorrectly.

-Lofton.


>X-Sender: lofton@terminal.rockynet.com
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>Date: Mon, 11 Jun 2001 10:50:11 -0600
>To: Steve Carson <carson@gscassociates.com>,puk@igraphics.com,
>  100434.3031@compuserve.com
>From: Lofton Henderson <lofton@rockynet.com>
>Subject: Re: Fwd: CGM:1999 defect
>X-RCPT-TO: <lofton@rockynet.com>
>
>Hi Everyone,
>
>Here is the defect which should be processed.  You'll need to fuss around 
>with some details, such as the "Secretariat" and the dates.  Please let me 
>know if you need anything else.
>
>Thanks,
>-Lofton.
>
>
>
>*******************
>Lofton Henderson
>1919 Fourteenth St., #604
>Boulder, CO   80302
>
>Phone:  303-449-8728
>Email:  lofton@rockynet.com
>*******************

Title: Reflectance

1	Defect Report Number: 8632:1999-1/001
2	Submitter: Henderson
3	Addressed to: JTC1/SC 24/WG 6 Rapporteur Group on ISO/IEC 8632, CGM
4	WG secretariat: ???
5	Date Circulated by WG secretariat: DD MMM 2001
6	Deadline on response from editor: :DD MMM 2001
7	Defect Report concerning IS 8632:1999 Computer Graphics: Metafile for the storage and transfer of picture description information (CGM) Part 1, Functional specification.
8	Qualifier (e.g. error, omission, clarification required): Correction
9	References in document (e.g. page, clause, figure and/or table numbers): clause 7.6.24, page 177; clause 7.6.25, page 178.
10	Nature of defect (complete, concise explanation of the perceived problem): There is a mistake in each of the Description sections, for NUBS and NURBS. In the Description section of clause 7.6.24, the last sentence of the 2nd paragraph says: "The end value shall be less than the n-th knot value (where n is the number of control points). In the Description section of clause 7.6.25, the last sentence of the 3rd paragraph says: "The end value shall be less than or equal to the n-th knot value (where n is the number of control points). The two statements are inconsistent, and both are incorrect. The correct statement in both cases is: "The end value shall be less than or equal to the (n+1)st knot value (where n is the number of control points)." Note: this latter sentence is as agreed by a technical committee examining problems with the NUBS & NURBS specifications prior to the 1999 republication of ISO/IEC 8632. However the agreed correction was not accurately reflected in the defect report, 8632:1992-1/065, nor in the final text of ISO/IEC 8632:1999.
11	Solution proposed by the submitter (optional): Replace the last sentence of the 2nd paragraph of the Description section of 7.6.24, and the last sentence the 3rd paragraph of the Description section of 7.6.25, with the sentence: "The end value shall be less than or equal to the (n+1)st knot value (where n is the number of control points)."
12	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): Amend the standard as proposed above.