[Standards] XEP-0106: JID\20Escaping

[Peter Saint-Andre]

Ian Paterson wrote:
> Peter Saint-Andre wrote:
>> Joe Hildebrand wrote:
>>> On Jun 3, 2007, at 1:39 PM, Ian Paterson wrote:
>>>
>>>> Peter Saint-Andre wrote:
>>>>> 3. A node identifier MUST NOT start with the string \20, which 
>>>>> would be escaped to SP (" ") and therefore mess up transformations 
>>>>> to numerous other systems (and probably also mess with users' 
>>>>> heads). I think \20 is OK at the end of a node identifier but we 
>>>>> might want to discourage that as well.
>>>>
>>>> Yes, we might want to discourage all whitespace characters at the 
>>>> start or end of a node identifier (e.g., non-breaking spaces, tabs...).
>>>
>>> "Real" whitespace isn't allowed at all, and \20 is the only escaped 
>>> whitespace that is permissible.  Therefore, prohibiting \20 at the 
>>> ends is sufficient.
>>
>> Correct.
> 
> Yes, sorry, my bad.
> 
> I guess I didn't understand why the Introduction of XEP-0106 says:
> "All whitespace characters (which reduce to U+0020, also called SP)"
> 
> Instead of saying:
> U+0020 (<space> or SP)

I suppose that's an oblique reference to the nodeprep profile of 
stringprep, which prohibits both ASCII space characters and non-ASCII 
space characters as specified in Appendices C.1.1 and C.1.2 of RFC 3454.

Peter

-- 
Peter Saint-Andre
XMPP Standards Foundation
http://www.xmpp.org/xsf/people/stpeter.shtml

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