hello world >hello world (db mode="mask") (use)queries/someSQLquery(/use) someColName
[link to="someURL"]someOtherColName[/link] (/db) ##

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

d

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

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5 = 12
12 = 24
24 = 34

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d

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$result = $data+10;

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

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[b]5[/b]

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1 : [b]5[/b]
2 : [b]12[/b]
3 : [b]12[/b]10

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 (given this="hello")
   
     [use]somefile[/use]
   
   
     [use]someOtherFile[/use]
   
 (/given)

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(given this="(c)5(/c)")
  <12>
     the answer is 12!
  
  
     the answer was not 12, so therefore c was given 
     a value other than 5

     [link to="someurl"]click[/link] here to try again!
  
 (/given)