User:Con-struct/TestAutoSVG/MarkerShape

    <g id="graphXXXmarkershape" transform="translate(10,10)"><rect x="-5" y="-5" width="10" height="10"/></g>  <!-- regular square --> 
    <marker id="graph1marker" class="graph1marker" refX="10" refY="10" viewBox="0 0 20 20" markerUnits="userSpaceOnUse" markerWidth="20" markerHeight="20">
      <use xlink:href="#graph1markershape"/>  
    </marker>
    <marker id="graph1markerstretch" class="graph1marker" refX="10" refY="10" viewBox="0 0 20 20" markerUnits="userSpaceOnUse" markerWidth="20" markerHeight="20">
      <use transform="scale(1, 1)" xlink:href="#graph1markershape"/>  
    </marker>