param1 :
param2 :
param3 :
param4 :
<mask
  id="test_mask_dom1"
  maskUnits="userSpaceOnUse"
  x=""
  y=""
  width=""
  height=""
>
  <path
    d = "M 60,50 130,210 190,60 60,50"
    fill = "#cccccc"
    fill-opacity = "0.4"
  />
  <path
    d = "M 90,70 160,230 220,80 90,70"
    fill = "#cccccc"
    fill-opacity = "0.4"
  />
  <path
    d = "M 120,90 190,250 250,100 120,90"
    fill = "#cccccc"
    fill-opacity = "0.4"
  />
  <path
    d = "M 150,110 220,270 280,120 150,110"
    fill = "#cccccc"
    fill-opacity = "0.4"
  />
</mask>