data Symbol 
     = \lit(str string) 
     | \cilit(str string)
     | \char-class(list[CharRange] ranges)
data Symbol
     = \empty() 
     | \opt(Symbol symbol)  
     | \iter(Symbol symbol)   
     | \iter-star(Symbol symbol)   
     | \iter-seps(Symbol symbol, list[Symbol] separators)   
     | \iter-star-seps(Symbol symbol, list[Symbol] separators) 
     | \alt(set[Symbol] alternatives)
     | \seq(list[Symbol] symbols)
data Symbol = \conditional(Symbol symbol, set[Condition] conditions) ;
Usage import ParseTree;
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