function ABNFToText(
    const AText: String
): String;

String - Plain text representation of the ABNF rule(s).

ABNFToText is a String function used to a string containing Augmented Backus-Naur Form syntax data and rules to its representation as plain text. Augmented Backus-Naur Form is described in the following Internet Standards document: 

RFC 2234 - Augmented BNF for Syntax Specifications: ABNF  

ABNF is often used to define a syntax format used in many Internet specifications. 

ABNFToText conforms to the rule forms, definitions, naming conventions, and operators in ABNF using 7-bit US-ASCII in an 8-bit field, with the high (8th) bit set to zero (NET-ASCII).