Zvon Graphotron - vcg: backarrowstyle

<graphotron xmlns:vcg="http://zvon.org/graphotron/vcg" xmlns="http://zvon.org/graphotron" >
     <vertex match="/*/*">
          <name select="name()"/>
     </vertex>
     <edge match="/*/START1" select="/*/END1">
          <vcg:backarrowstyle>solid</vcg:backarrowstyle>
          <vcg:backarrowcolor>yellow</vcg:backarrowcolor>
     </edge>
     <edge match="/*/START2" select="/*/END2">
          <vcg:backarrowsize>20</vcg:backarrowsize>
          <vcg:backarrowstyle>line</vcg:backarrowstyle>
          <vcg:backarrowcolor>green</vcg:backarrowcolor>
     </edge>
     <edge match="/*/START3" select="/*/END3">
          <vcg:backarrowsize>10</vcg:backarrowsize>
          <vcg:backarrowcolor>blue</vcg:backarrowcolor>
     </edge>
     <edge match="/*/START4" select="/*/END4">
          <vcg:backarrowsize>10</vcg:backarrowsize>
          <vcg:backarrowstyle>solid</vcg:backarrowstyle>
          <vcg:backarrowcolor>magenta</vcg:backarrowcolor>
     </edge>
</graphotron>

Namespace:	http://zvon.org/graphotron/vcg
Element:	backarrowstyle
Description:	arrowstyle, backarrowstyle : each edge has two arrow heads: the one appears at the target node (the normal arrow head), the other appears at the source node (the backarrow head). Normal edges only have the normal solid arrow head, while the backarrow head is not drawn, i.e. it is none. Arrowstyle is the style of the normal arrow head, and backarrowstyle is the style of the backarrow head. Styles are none, i.e. no arrow head, solid, and line.
Values:	none, line, solid