Thanks everyone for setting me straight on coordinate systems!

Andreas' and André's comments about the FireFox 1.5 sensitivity to
coordinate range limits are a bit disturbing. I spent a good hour or two
debugging a scripted SVG file that had a related issue. I had build a
little test map that tracked coordinates into a window that was in
geographic coordinates (both the map and the tracking window were using the
same viewBox.) It worked fine in ASV but in FF, I found that text embedded
in tspan tags vanishes when you use size attributes less than one. I didn't
pursue it in detail, but it seemed like the problem was related to not
enough range across the map relative to the font sizes. Once I took the
tracking window out of geographic space and into a pixel-based integer
space, everything was fine.

I've been told by one ex-SVG developer that "SVG is dying, and that's why I
don't use it anymore," so I was hoping that since the mozilla team is
building it into the new Firefox that maybe this would revitalize it.
However, since I'm just learning about ecma/java scripting, running into
bugs like these is very frustrating since I don't know if it's my buggy
script or mozilla's buggy or unfinished SVG code causing the problem!

BTW Andreas, your scripting examples in "Navigation Tools for SVG Maps" at
http://www.carto.net/papers/svg/navigationTools/ are fantastic! They're
still way over my head, but I can get them to work even though I don't yet
understand what's going on. It proves to me that with the addition of some 
sophisticated scripting, SVG really can be a useful tool and not just a 
"map toy."

- Bill Thoen


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