[antlr-interest] what causes the Group of rules

[bace.spam at gmx.net]

Hi all.

Just a short question, I am using antlr v3 and antlr.works. In antlr.works I found out that you can group parser and lexer rules. 

// $<Group
NEWLINE                    : (('\r')? '\n' | '\r');
// $>

What does it mean? Is it only to support overview or has this some consequences to the parser/lexer behavior?

Thank you very much!
Markus
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