svg/xforms calculator sample (and some smaller test cases)

this is the same functionality as the xforms calc program but uses svg 
elements to fire the xforms events. There are a couple of little issues 
(like I want to implement the "." and SquareRoot button and I want to get a 
nice rollover/mousedown effect, etc. I'd like to add xforms validation and 
keyboard support as well, but that'll come in time).

The biggest "hack" in there right now is outputting the xforms instance data 
inside the SVG interface. Namely, xforms binding isn't supported for svg 
elements and I couldn't use xforms binding inside an svg foreignObject 
element.. even though "hardcoding" the <xf:output> works.. it won't bind. 
See sample02 and sample04 for how I wish it would have worked. Suggestions 
for how to do this in script are welcome as well, but for now there's not 
javascript anywhere.

I'm open to suggestions for how you would have implemented the display of 
the "Result" and "Memory" fields.. or any other suggestions too. Note: I'm 
not an artist/designer.. so I apologize if the svg isn't "all it could be."

If I get really ambitious it'd be interesting to see if I could break out 
the xform actions and the UI so that you could plug in either an SVG or 
XHTML output (possibly dependent on if svg is available?)

http://artforms.progressivex.com/mozilla/svgcalc.xml

http://artforms.progressivex.com/mozilla/sample02.xml
http://artforms.progressivex.com/mozilla/sample04.xml

http://artforms.progressivex.com/mozilla/sample01.xml  -- I posted this 
early as a proof of concept of having xforms output inside an svg element 
(using svg's foreignObject)

http://artforms.progressivex.com/mozilla/sample03.xml -- silly test of 
xf:extension to output svg. It works, but I don't know how useful this is.

you need xforms and svg support enabled in your browser to view these 
properly. I can post a screenshot of it if you wanna see but don't have it 
and don't want to get one. Just let me know.

-Andrew