Listing A: button.svg
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg width="200" height="50">
 <a xlink:href="http://www.builder.com">
 <rect x="3" y="6" width="193" height="37"  
  style="fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:1"/>
 <text x="26px" y="17px" transform="translate(13 12)"
  style="fill:rgb(0,0,0);font-size:24;font-family:Arial">Button</text>
 </a>
</svg>