Re: FW: different AST's

> Why are the AST's emitted by the online grammar checkers at the XML 
Query
> website different from those produced by walking the formal BNF's 
manually?
> The former omit a lot of the intermediate productions. How come?

When we make the JavaCC/JJTree parser we spec certain nodes as "void" in 
certain contexts, meaning, they don't have real meaning in the AST, so 
don't construct them.  I would like to void more nodes, actually.   It's 
really only a means of keeping the size of the tree down.

-scott