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<say>hello world</say>

...
    [link to="someURL"]<d>someOtherColName</d>[/link]
  </mask>
(/db)

rule 1 : tags are computed from the innermost towards the outermost.

<a><b><c>d</c></b></a>

let us say that d = 5
and that c means add 7
and that b means multiply by 2
and a means add 10

<c>5</c> = 12
<b>12</b> = 24
<a>24</a> = 34

<a><b><c>d</c></b></a>

$result = $data+10;

[a][b][c]5[/c][/b][/a]

<a>[b]<c>5</c>[/b]</a>

1 : <a>[b]<c>5</c>[/b]</a>
2 : <a>[b]12[/b]</a>
3 : [b]12[/b]10

 (given this="hello")
   <hello>
...
     [use]someOtherFile[/use]
   </else>
 (/given)

(given this="(c)5(/c)")
  <12>
...
     [link to="someurl"]click[/link] here to try again!
  </else>
 (/given)