[Standards] Some issues in XEP-0106: JID Escaping

Waqas Hussain waqas20 at gmail.com
Sat Feb 13 20:42:25 UTC 2010

Guus der Kinderen<http://jabber.markmail.org/message/kihf36azo2kvmczf?q=guus>
out some problems in XEP-0106 in the JDev chatroom.

Section 1. of the XEP lists nine code points which are forbidden in a node
identifier. The character '\' is not in that list, and is used as the escape
character in the algorithms described in the XEP.

Section 4.3 states:

"In order to maintain as much backward compatibility as possible, partial
> escape sequences and escape sequences corresponding to characters not on the
> list of disallowed characters MUST be ignored."

The sequence '\5c' (corresponding to the character '\') as input to the
escaping algorithm needs to be escaped. But it isn't a partial escape
sequence, and it doesn't correspond to a disallowed character, so the above
text dictates that it not be escaped. This breaks the algorithm. A possible
correction is to refer to the mapping in tables 1 or 2, instead of the list
of disallowed characters.

In section 5.1, table 3, the last four examples 9, 10, 11 and 12 do not
follow section 4.3 exceptions. The '\' characters in those examples MUST not
be escaped, according to section 4.3. Example 12 in that list would be
correct with the above suggested correction to section 4.3.

Waqas Hussain
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