As far as I know, support for SVG or _any_ vector image format is much, much
less common than for bitmap formats such as PNG or GIF.
Yes, but SVG is catching up rapidly. As a W3C standard, it *will* be
widely implemented.
So editing bitmaps is
fairly trivial with well-defined results. With vector formats, there is a
very complex one-way relationship between the file and what you see on the
screen so the ability to edit them requires much, much more complexity.
But we are describing an *archival* format. It's not important that they
be editable, it's important that they be renderable on the widest range of
output devices as is possible.
--lyndon
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