<ElementDatabase name="C">
 <Column name = "i" type = "int">
  0 0 1 1 2 3 4 4 5 6 7 7 8 ;
  1 0 1 1 2 3 4 4 5 6 7 7 8 ;
 </Column>
 <Column name = "j" type = "int">
  0 0 1 2 2 3 4 5 5 6 7 8 8 ;
  1 0 0 1 2 3 3 4 5 6 6 7 8 ;
 </Column>
 <Column name = "v" type = "float">
  0 1.0 1.0 0.5 0.5 1.0 1.0 0.5 0.5 1.0 1.0 0.5 0.5 ;
  1 0.5 0.5 1.0 1.0 0.5 0.5 1.0 1.0 0.5 0.5 1.0 1.0 ;
 </Column>
</ElementDatabase>
