<?xml version=“1.0” standalone=“no”?> <!DOCTYPE svg PUBLIC “-//W3C//DTD SVG April 1999//EN”

"http://www.w3.org/Graphics/SVG/svg-19990412.dtd">

<svg width=“4in” height=“3in”>

<defs>
  <symbol id="Triangle" min-x="0" min-y="0" max-x="100" 
    max-y="100" ref-x="0" ref-y="50">
    <path d="M 0 0 L 0 100 L 100 50 z"/>
   </symbol>
 </defs>
<desc>An double-headed arrow example using markers
</desc>
<path d="M0 0">
  <!-- Place an arrowhead rotated 180 degrees at the 
       beginning of the path -->
  <marker href="#Triangle" width="200" height="200" 
        style="text-transform: rotate(180)"/>
  <data d="M 2000 2000"/>
  <!-- Turn off markers in the middle of the path -->
  <marker href=""/>
  <data d="L 4000 2000 L 4000 4000"/>
  <!-- Place an arrowhead at the end of the path-->
  <marker href="#Triangle" width="200" height="200"/>
  <data d="L 6000 4000"/>
</path>

</svg>