On 23/09/14 12:18, Bert Gunter wrote: <SNIP> > Daniel: > > Do you understand what a parse tree is? <SNIP> Paraphrasing a quote attributed to Feynman: "If you think you understand what a parse tree is, then you don't understand what a parse tree is." :-) cheers, Rolf -- Rolf Turner Technical Editor ANZJS