title: Smil animations on svg
body: <p>Greeting to all,</p>
  
  <p>I recently found myself reading the following article (<a href="http://apike.ca/prog_svg_smil.html" rel="nofollow">http://apike.ca/prog_svg_smil.html</a>) and more specifically the "Animation Element - animateMotion".</p>
  
  <p>Is there a way of "telling" the moving "marker" to accelerate or decelerate on specific portions (segments) of the path, or is its speed always defined by the "dur" attribute (in seconds)?</p>
  
  <p>Thanks in advance.</p>