ABNF
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... Augmented BNF defined in [5].
Some general ABNF definitions that are required throughout the
document will be defined later in this section. At first reading, it
may be wise to simply recall that these definitions exist here, and
...
...
This document imports the core ABNF definitions given in Appendix A
of [5]. There definitions will be found for basic ABNF ...
... ABNF definitions given in Appendix A
of [5]. There definitions will be found for basic ABNF elements like
ALPHA ...
... finds relevant.
Note that in ABNF, string literals are case insensitive. That
convention is preserved in this document, and implies that FTP
commands ...
...
Implementors should note that the ABNF syntax used in this document
and in other FTP related documents (but not used in [3 ...
... Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 4234draft, October 2005. ...