<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG April 1999//EN" "http://www.w3.org/Graphics/SVG/svg-19990412.dtd">
<svg width="4in" height="3in">
  <title>Kona Lavadome mountain bike
  </title>
  <desc>This picture shows a mountain bike, a human-propelled, 
  multi-terrain vehicle. While it can be succesfully used on moorland, 
  forest, roads, and large hills it is not actually suitable for going 
  up mountains.
  </desc>
  <g id="bike">
    <defs>
      <symbol id="spoke">
        <desc>14/12 gauge double butted spoke</desc>
<!-- the path data goes here -->
      </symbol>
      <symbol id="hub">
        <desc>black anodised low torsion hub</desc>
<!--the path data goes here -->
      </symbol>
      <symbol id="rim">
        <desc>twin wall, eyeletted rim</desc>
<!-- the path data goes here-->
      </symbol>
      <symbol id="cogs">
        <desc>8 speed, wide ratio gearing</desc>
<!--the path data goes here -->
      </symbol>
      <symbol id="lacing">
        <desc>double cross lacing of 32 spokes</desc>
      </symbol>
    </defs>
<!-- the overall bike drawing goes here -->
    <g id="frontwheel">
      <title>Front wheel</title>
      <desc>The front wheel provides grip, steering and some shock absorption</desc>
      <use href="id(lacing)" style="rotation: 20deg; fillcolor: black"/>
    </g>
    <g id="backwheel"/>
    <g id="frame">
<!-- and so on -->
    </g>
  </g>
</svg>