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Update content/appendices.md

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Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
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Tulir Asokan 2025-01-14 20:05:38 +02:00 committed by GitHub
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@ -615,10 +615,11 @@ and servers MUST accept user IDs with localparts consisting of any legal
unicode codepoint except for `:` and `NUL` (U+0000), including other control
characters and the empty string. Localparts MUST be valid UTF-8 sequences.
Servers SHOULD NOT produce user IDs with localparts outside of the following
character set, and SHOULD NOT forward such user IDs to clients when referenced
outside the context of an event. For example, device list updates from "invalid"
user IDs would be dropped by the receiving server.
User IDs with localparts containing characters outside the range U+0021 to U+007E, or with
an empty localpart, are considered non-compliant. For current room versions, servers must
still accept events using such user IDs over federation; however they SHOULD NOT forward
such user IDs to clients when referenced outside the context of an event. For example,
device list updates from non-compliant user IDs would be dropped by the receiving server.
extended_user_id_char = %x21-39 / %x3B-7E ; all ASCII printing chars except :