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RE: CGZ files

From: Lofton Henderson <lofton@rockynet.com>
Date: Mon, 20 Oct 2008 10:06:18 -0600
Message-Id: <5.1.0.14.2.20081020100330.032e1eb0@localhost>
To: "Bezaire, Benoit" <bbezaire@ptc.com>, "WebCGM WG" <public-webcgm-wg@w3.org>

Benoit,

Oops, my message crossed with yours.

In short:  I agree that this is a conformance requirement for WebCGM 2.1, 
specifically that 2.1 viewers must handle gzip-compressed 2.1 instances, 
and that valid 2.1 instances included plain Binary Encoding as well as 
gzip-compressed instances of binary-encoded 2.1 metafiles.

Long analysis:  see my other just-sent message.

-Lofton.

At 11:23 AM 10/20/2008 -0400, Bezaire, Benoit wrote:

>I see your point, however...
>
>We have customers using WebCGM 1.0 "compliant" tools (IsoDraw/IsoView v6
>for example). Now, these customers could get a WebCGM 1.0 .cgz and those
>"compliant" applications would reject them. That's not very
>user-friendly.
>
>Maybe it's better to do this as a WebCGM 2.1 feature.
>
>Benoit.
>
>-----Original Message-----
>From: Don L. [mailto:dlarson@cgmlarson.com]
>Sent: Friday, October 17, 2008 6:59 PM
>To: Bezaire, Benoit
>Cc: WebCGM WG
>Subject: re: CGZ files
>
>Benoit
>
> >  Hi  All,
> >
> >  I find the draft  underspecified about compressed CGM files. More
> > specifically, we would like to  know what kind of CGM files may be
> > compressed?
> >
> >  Version1 to  4?
> >  Can I compress a  WebCGM 1.0 CGM file for example?
> >
> >  Is this a WebCGM 2.1  conformance feature for viewer and authoring
>tools?
> >  Or is this a new WebCGM  2.1 (and only 2.1) 'encoding scheme' ... for
>
> > lack  of a better  word?
>
>I think 'encoding scheme' is a better characterization. The text for
>this feature in the webcgm 2.1 spec was extracted from the SVG spec.
>
>My thinking is that this is a viewer conformance issue and a WebCGM 2.1
>viewer should be able to open a file with a .cgz extension and know that
>it needa to decode this file according to the gzip spec. with the
>assumption that results will be a file that conforms to the WebCGM
>profile (any version e.g.
>1.0 , 2.x).
>
>Don.
>
> >  Thanks.
> >  Benoit.
Received on Monday, 20 October 2008 16:23:56 GMT

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