What is default value for tokens?

Hi all,

My grammar contains:

%token QUALIFIED-NAME           ;; qualified identifier or symbol
%token LITERAL                  ;; any literal, string, number, char
%token COMMENT                  ;; any comment

and then I get warnings:

*Warning* default value of <<no-type>> tokens changed to LITERAL, was
COMMENT
*Warning* default value of <<no-type>> tokens changed to QUALIFIED-NAME,
was LITERAL

Questions:

   1. What is the 'type' thing and why is it useful?
   2. What is 'default value' and why is it useful?


Thanks,
Gracjan

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