v.support

[etep at etep.dsnet.it]

I am in trouble using v.support command because I cannot make clear about
the methods used to build areas and isles.
Following you can find a few little examples (dig_ascii file format) where
the results are not clear:

Example 1:
A  5
  1.0    1.0
  1.0    3.0
  3.0    3.0
  3.0    1.0
  1.0    1.0
-->	Aree: 1
	Isole: 1

Example 2:
  1.0    1.0
  1.0    5.0
  5.0    5.0
  5.0    1.0
  1.0    1.0
A  5
  2.0    2.0
  2.0    4.0
  4.0    4.0
  4.0    2.0
  2.0    2.0
-->	Areas: 2
	Isles: 2

Example 3:
A  5
  1.0    1.0
  1.0    5.0
  5.0    5.0
  5.0    1.0
  1.0    1.0
A  2
  1.0    1.0
  2.0    2.0
-->	Areas: 0
	Isles: 1


Examples 4:
A  5
  1.0    1.0
  1.0    5.0
  5.0    5.0
  5.0    1.0
  1.0    1.0
A  2
  1.5    1.5
  2.0    2.0
-->	Areas: 1
	Isles: 1

Examples 5:
A  5
  1.0    1.0
  1.0    5.0
  5.0    5.0
  5.0    1.0
  1.0    1.0
A  2
  5.0    5.0
  4.0    4.0

-->	Areas: 1
	Isles: 1

Probably a detailed programmers documentation about isles and areas could
help me to understand how v.support works. Could someone help me to find it ?  

Thank You in advance!
Elena
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