1<?xml version="1.0" standalone="no"?> 2<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG April 1999//EN" "http://www.w3.org/Graphics/SVG/svg-19990412.dtd"> 3<svg width="4in" height="3in"> 4 <defs> 5 <symbol id="Triangle" min-x="0" min-y="0" max-x="100" max-y="100" ref-x="0" ref-y="50"> 6 <path d="M 0 0 L 0 100 L 100 50 z"/> 7 </symbol> 8 </defs> 9 <desc>An double-headed arrow example using markers 10 </desc> 11 <path d="M0 0"> 12 <!-- Place an arrowhead rotated 180 degrees at the 13 beginning of the path --> 14 <marker href="#Triangle" width="200" height="200" style="text-transform: rotate(180)"/> 15 <data d="M 2000 2000"/> 16 17 <!-- Turn off markers in the middle of the path --> 18 <marker href=""/> 19 <data d="L 4000 2000 L 4000 4000"/> 20 21 <!-- Place an arrowhead at the end of the path--> 22 <marker href="#Triangle" width="200" height="200"/> 23 <data d="L 6000 4000"/> 24 </path> 25</svg> 26