add section on what constitutes a good AST

Anniepoo / swipldcgtut

A tutorial for DCG's in swi-Prolog

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add section on what constitutes a good AST #7

Open Anniepoo opened 8 years ago

Anniepoo commented 8 years ago

the tutorial could use some good words on semantic issues - notably, what constitutes good output of a lexical analyzer, and what constitutes a good AST.