[antlr-interest] Question on the protected keyword in lexer

[Bryan Ewbank]

INT and FLOAT are "protected", meaning that they are not considered in 
determining what may be returned from the lexer. That's all it means.
 Said another way, if I see the token "0' following by ".", the lexer cannot 
know if it is supposed to use rule INT, or rule FLOAT_OR_INT. Making INT 
protected means that it is not visible outside the lexer, and therefore it's 
not considered when determining ambiguity.
 Hope this helps,
- Bryan
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