[Standards] roster schema

Richard Dobson richard at dobson-i.net
Fri Jul 6 09:54:01 UTC 2007

> In my working copy of rfc3921bis I have:
> ***
>    The server SHOULD return a <not-allowed/> error to the client if the
>    roster set violates any of the following rules:
>    1.  The <item/> element MAY contain a 'name' attribute, but the value
>        of the 'name' attribute SHOULD NOT be more than 1023 characters
>        in length.
>    2.  The XML character data of any given <group/> element MUST NOT be
>        of zero length and SHOULD NOT be more than 1023 characters in
>        length.
> ***
> It says SHOULD NOT. If a server has good reasons to go over 1024, it is
> perfectly allowed to do so. So this is a guideline, not a requirement.
> As a guideline I think it makes a lot of sense (we can quibble over the
> size).

It would be handy to also specify an extended additional error along 
with the <not-allowed/> so that the client can know what part of the 
roster item is wrong which would add to the flexibility, e.g. 
<name-limit-exceeded xmlns="urn:xmpp:roster:errors"/> and 
<groupname-limit-exceeded xmlns="urn:xmpp:roster:errors"/>.

This will allow the client to present the appropriate message to the 
user as to what they need to modify, this along with the not set in 
stone limit of 1023 is flexible enough for me.


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