[antlr-interest] Antlr 3 syntax question

[shmuel siegel]

I would also like to understand the usage of alternatives and 
parenthesis. According to AntlrWorks, the following rule has 4 
alternatives consistent with the visual layout of this rule. The second 
and third alternatives are identical. My question is "Why is there an 
implied parenthesis around the second alternative?". In other words, 
does sequencing of tokens always take precedence to alternatives?

levelExpr     :
        INT
    |
         '@level' '(' 'offset' '=' INT ')'
    |
         ('@level' '(' 'offset' '=' INT ')' )
    |
    ;



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