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>The X::IQ relationship</A
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><P
>As has been noted, some of the X namespaces have cousins in the
IQ space—<I
CLASS="EMPHASIS"
>autoupdate</I
>,
<I
CLASS="EMPHASIS"
>conference</I
>, <I
CLASS="EMPHASIS"
>roster</I
>,
and <I
CLASS="EMPHASIS"
>oob</I
>. If you're still confused about
which to use where, there's a rule of thumb about context: The
IQ namespaces generally are used to qualify a
<I
CLASS="EMPHASIS"
>conversation</I
> that revolves around whatever
the namespace represents, while the X namespaces apply more
to one-off, ad-hoc, information-laden messages. </P
><P
>For example, the
<TT
CLASS="LITERAL"
>jabber:iq:conference</TT
> namespace qualifies the
much of the content of a conversation between a user and the
conferencing service regarding entry to a specific room.
The <TT
CLASS="LITERAL"
>jabber:x:conference</TT
> namespace
is used to provide context and meaning to a pointer to a room.</P
><P
>Likewise, the <TT
CLASS="LITERAL"
>jabber:x:oob</TT
> namespace qualifies
a pointer to some piece of information that is out of band, where
as the <TT
CLASS="LITERAL"
>jabber:iq:oob</TT
> namespace provides
context to a negotiation that leads to the usage of that external
bandwidth.</P
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