Inkscape does not support the animation tags. HTML5 promises a lot of support for SVG animation. Firefox next release will use the Mozilla engine that is being developed now. The builds already support SMIL animation .
The <animateMotion> element allows for much more flexibility in SVG animations. Mozilla’s nightly builds have supported animation of most SVG attributes and properties for a while now, but <animateMotion> gives authors the added ability to effortlessly animate an element to move along any arbitrary path.