EXPRESS language version identifier

[Yoshihito KIKUCHI]

I agree with Dr. Peter Wilson.

After of DAM release, edition 2 based and TC2 based model will be
intermingled in model description. I am afraid that this leads a
significantly trouble in upward compatibility. So, I reported some
comments from Japanese delegation in previous Myrtle Beach meeting as
following.

- DAM based EXPRESS model should have a version identifier. If version
identifier is omitted, the version should be interpreted as version 3
(TC2 level).
- The version identifier should have 1 to 4.
- Conformance class should be used for version 4 based but with no new
feature model.

In my memory, above three comments are agreed. I hope version id will
be remained and these agreements will carry out.

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Dr. Yoshihito KIKUCHI        E-Mail: kikuchi at eli.hokkai-s-u.ac.jp
Hokkai-Gakuen University     Tel:    +81-11-841-1161 (Ext. 845)
Faculty of Eng.              Fax:    +81-11-551-2951
Dep. of Elec. and Info. Eng.

From: "Wilson, Peter R" <peter.r.wilson at boeing.com>
Subject: EXPRESS language version identifier
Date: Wed, 12 Jun 2002 09:42:18 -0700
Message-ID: <2B3AE89CEF0DD44EA000B433DEE83D990361E83F at XCH-KNT-05.nw.nos.boeing.com>

>     I have heard a rumour that WG11 at Stockholm is recommending the removal
> of the EXPRESS language version identifier from the DAM.
> 
>     I think that this would be a poor decision. Briefly:
> 
> o For long term data retention EXPRESS models and data (e.g., Part 21 files)
> will be stored. There needs to be standard method for identifying the stored
> EXPRESS language version.
> 
> o The DAM introduces new keywords. Any edition 1 model that has used these
> as identifiers will be in error if they are parsed as edition 2. EXPRESS
> usage is not limited to SC4 so any argument based on "STEP has not used
> these as identifiers" is specious.
> 
> Peter W.
> 
> PS. What is the probability that proposed changes to the DAM will be
> circulated to interested WG11 members before the end of the Stockholm
> meeting? 
> 
> Dr Peter R. Wilson
> Boeing Commercial Airplanes
> PO Box 3707, MS 6H-AF, Seattle, WA 98124-2207
> (Package Delivery: MS 6H-AF, 1601 E. Valley Frontage Road, Renton, WA 98055)
> Tel: (425) 237-3506, Fax: (425) 237-3428
> Email: peter.r.wilson at boeing.com
> --------------------------------
> Any opinions expressed above are personal;
> they shall not be construed as representative of any organisation.
> --------------------------------
>