XML/SVG/opacity

Rendering Rectangles with Opacity

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20001102//EN"
 "http://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd">
<svg width="100%" height="100%">
  <g transform="translate(50,50)">
    <rect x="0" y="0" width="150" height="50" style="fill:red;"
      opacity="1" />
  </g>
  <g transform="translate(50,250)">
    <rect x="0" y="0" width="150" height="50" style="fill:red;"
      opacity=".2" />
  </g>
</svg>