Category "grammar"

How can I parse the code that is conforming to a grammar expressed using ANTLR4 and then generate XML tags

I have specified a grammar using ANTLR4 using VScode and the extension by Mike Lischke. I am wondering if there is a way to parse the code of the program that i

Empty productions in RFC 5234 (Augmented BNF)

Does Augmented BNF (as specified by RFC 5234) allow matches to empty string? From reading grammar of the Augmented BNF itself (section 4, ABNF Definition of ABN