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I wrote: > you need a formal specification too, in BNF, as in r5rs. Here's a stab at how to do this: The r5rs formal syntax is extended by making the following modifications: -- In r5rs 7.1.1, -- For each X in token, identifier, variable, boolean, character, string, and number, change the name of entity <X> to <raw X>. -- Add "#;" to the <raw token> rule. -- In r5rs 7.1.2, -- Add this rule: <commented datum> ---> #; <datum> -- For each X in token, identifier, variable, boolean, character, string, and number, add a rule: <X> --> <commented datum>* <raw X> -- In all of the production rules of 7.1.2 through 7.1.5, every literal entity like "(", ")", "quote", or "lambda" is defined to mean the corresponding <token> or <identifier>, not a <raw token> or <raw identifier>. I encourage anyone who would like to see different behavior standardized to provide a formal specification of what he desires. -al