[Dune] The Alberta Grid File in dune-grid-howto

[Ankur Jayesh]

Dear Sir,
I am trying to read the file grids/2dgrid.al in dune-grid-howto module and I
have a doubt in that respect.

The file contains the text:

DIM: 2
DIM_OF_WORLD: 2

number of elements: 2
number of vertices: 4

vertex coordinates:
0.0 0.0
1.0 0.0
1.0 1.0
0.0 1.0

element vertices:
2 0 1
0 2 3

element boundaries:
1 1 0
1 1 0


While I have understood everything else, the thing that perplexes me is the
element boundaries section.
I can neither make head or tail of what it does. I would be thankful for
help there.
Especially, what does the "1 1 0" string specify ? (the vertices or the
coordinates etc....)

Regards
Jayesh
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