[jdev] presence stanza processing with group chat

[Tong]

In JEP0045, for example 127 (the Note under example 128), it says presence
stanzas such as this

<presence
    from='crone1 at shakespeare.lit/desktop'
    to='darkcave at macbeth.shakespeare.lit/firstwitch'>
</presence>

should be assumed to come from a client that supports "group char 1.0"
and a default room should be created.

My question is: how does the server/service tell whether this is a
room creation request, or a directed presence request as described in
rfc3921 5.1.4 or am I totally off?
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