<?xml version="1.0" ?>
<svg
xmlns = "http://www.w3.org/2000/svg"
version = "1.1"
width = "500"
height = "500"
>
<polyline
points =" 10, 10
490, 10
10,490
490,490"
stroke = "green"
stroke-width = "8"
fill = "none"
/>
</svg>
<marker> which allows to define an arrowhead for a polyline.