Exporting SVG to raster image

Hi,
 
I am evaluating using SVG tools (Adobe SVG) as a possible solution to create interactive web graphical content. One of the requirements of the project that I am working on is that the user should be able to export the resultant graphic in BMP or JPEG format.
 
Is there a way to export SVG to raster format (BMP or JPEG)? Is this part of the spec? or it is vender implementation dependent?
 
Does SVG support belnding/transparent graphics?
 
Thanks,
Walid