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RFC 4790, "Internet Application Protocol Collation Registry", March 2007

Area Assignment: app
See Also: RFC 4790w/ inline errata

Errata ID: 3510
Status: Verified
Type: Editorial
Publication Format(s) : TEXT

Reported By: John Klensin
Date Reported: 2013-03-08
Verifier Name: Barry Leiba
Date Verified: 2013-03-08

Section Global says:

US-ASCII (most places)

It should say:

ASCII (but see note)


The terms "US-ASCII" and "ASCII" are used interchangeably in this document, sometimes in the same paragraph (see the first paragraph of 9.2.1). Neither is anchored in a reference to either X3.4-1986 (e.g., the "us-ascii charset") or to X3.4-1968 or RFC 20 (e.g., NVT ASCII). There is one explicit mention of the "US-ASCII charset" (Section 5) but all the rest, including the section titles that use "ASCII" already, appear to be talking about the ASCII repertoire with terms like "ASCII" (or "US-ASCII") letters. Except where the charset, or some very special property of X3.4-1986, is intended, I believe that all of these should be just "ASCII".

I don't think this is likely to cause any significant confusion among anyone who is likely to read this spec, much less confusion sufficient to cause interoperability problems (hence, it is not a technical error), but it is confusing and should be cleaned up --both to rationalize the terminology and to provide citations for the terminology that is used-- if the document is ever updated.

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