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Re: SVG12: snapshotTime optional

From: Chris Lilley <chris@w3.org>
Date: Mon, 18 Apr 2005 21:01:24 +0200
Message-ID: <1124978297.20050418210124@w3.org>
To: Bjoern Hoehrmann <derhoermi@gmx.net>
Cc: www-svg@w3.org

On Monday, April 18, 2005, 12:59:00 AM, Bjoern wrote:

BH> Dear Scalable Vector Graphics Working Group,

BH>   In
BH> http://www.w3.org/TR/2005/WD-SVGMobile12-20050413/struct.html the
BH> snapshotTime attribute is defined as

BH> [...]
BH>   Indicates a moment in time which is most relevant for a still-image of
BH>   the animated svg content. This time can be used as a hint to the SVG
BH>   User Agent for rendering a still-image of an animated SVG Document,
BH>   such as a preview.
BH> [...]

BH> This language suggests that implementation of this feature is optional.

It is thumbnail generation which is optional. SVG says nothing about how
big a thumbnail should be, whether it is animated, etc.

This language feature allows a content author to pick a moment in time
which is useful and representative, in the event that the tumbnail of
the animation is a single static image.

BH> This would violate
BH> http://www.w3.org/TR/2003/WD-SVGTiny12Reqs-20031209/
BH> which prohibes optional features in Tiny 1.2. Please either remove this
BH> feature from the draft or clearly indicate that implementation of this
BH> feature is mandatory.

How would you express a mandatory requirement on thumbnails? For
example, on many systems a fixed icon per media type is used Or a fixed
one for all images. or an animated icon could be used. or an icon that
has a red bar across the diagonal with the first frame in the upper left
half and the last frame in the bottom right half. Or many other ways.

 Chris Lilley                    mailto:chris@w3.org
 Chair, W3C SVG Working Group
 W3C Graphics Activity Lead
Received on Monday, 18 April 2005 19:01:26 UTC

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