RFC 3659:Extensions to FTP
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Protocol Element


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... FTP commands are protocol elements, and are always expressed in ASCII. FTP ...
... ASCII. FTP responses are composed of the numeric code, which is a protocol element, and a message, which is often expected to convey information to the user. It is not expected that users normally interact directly with the protocol elements ...
... protocol element, and a message, which is often expected to convey information to the user. It is not expected that users normally interact directly with the protocol elements, rather the user-FTP process constructs the commands, and interprets the results, in the manner best suited for the particular user. Explanatory text in ...



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