Op
TreeVisitor
For example, <and> <or> <isNull/> <true/> </or> <false> </and> becomes essentially (and (or (isNull (true))) (false))
<and> <or> <isNull/> <true/> </or> <false> </and>
(and (or (isNull (true))) (false))
See Also: ParenParserSee Also: for "semi-Lisp" implementation