Package TWiki::Infix::Node 
Base class for node types generated by Infix::Parser. You don't 
have to use
it, but it may be useful.
 ClassMethod newNode ($o,@p) -> \$if 
Construct a new parse node (contract with Infix::Parser)
 ClassMethod newLeaf ($val,$type) -> \$if 
Construct a new terminal node (contract with Infix::Parser)
 ObjectMethod evaluate (...) -> $result 
Execute the parse node. The parameter array is passed on, by reference,
to the evaluation functions.