private rules

Hello. A private-scoped rule cannot be referenced in the rule
definitions of other grammars and in other non-grammar documents and is
directly accessible only within its containing grammar. But if I have a
private rule, and user says something matching this rule, will this mean
that e.g. a field is filled? Or only public rules can be matched by user
input? 

 

 

Best regards, Anastasia Petrova