Subject: [xmpp] [Technical Errata Reported] RFC7622 (5789)

From: RFC Errata System <[email-masked]>
Date: Mon, 22 Jul 2019 02:12:44 -0700 (PDT)

The following errata report has been submitted for RFC7622,
"Extensible Messaging and Presence Protocol (XMPP): Address Format".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid5789

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Type: Technical
Reported by: Florian Schmaus <[email-masked]>

Section: 3.2.1

Original Text
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An entity that prepares a string for inclusion in an XMPP domainpart
slot MUST ensure that the string consists only of Unicode code points
that are allowed in NR-LDH labels or U-labels as defined in
[RFC5890].

Corrected Text
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An entity that prepares a string for inclusion in an XMPP
domainpart slot MUST ensure that the string consists only of
- code points allowed in U-labels as defined in [RFC5890]
- % U+0025 PERCENT SIGN
- . U+002E (FULL STOP, DNS label separator "dot")
- : U+003A (COLON)
- ] U+005B (LEFT SQUARE BRACKET)
- [ U+005D (RIGHT SQUARE BRACKET)

Notes
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This is a follow up and update on Errata ID #5769.  Besides allowing DNS label separators in the domainpart, this further allows codepoints not allowed in U-labels but required by the IP-literal rule of RFC6874, which is used by RFC7622 to allow IPv6 addresses in XMPP domainparts. As in the previous errata, this also drops the reference to NR-LDH labels, which I believe to be unnecessary.

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RFC7622 (draft-ietf-xmpp-6122bis-24)
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Title               : Extensible Messaging and Presence Protocol (XMPP): Address Format
Publication Date    : September 2015
Author(s)           : P. Saint-Andre
Category            : PROPOSED STANDARD
Source              : Extensible Messaging and Presence Protocol
Area                : Applications and Real-Time
Stream              : IETF
Verifying Party     : IESG