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>Chapter 7. Messages, Presence, and Presence Subscription</A
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>Now that we have a decent grounding in the Jabber protocol and technology,
let's put it to work for us. This chapter fits Jabber into solutions for 
two or three common problems, and shows how the technology and features 
lend themselves very well to application-to-person (A2P) scenarios.</P
><P
>By way of introduction, we'll have a look at constructing and sending
simple Jabber messages, to effect an "in your face" notification mechanism
for a version control system.  We'll also introduce a usage of the 
<TT
CLASS="LITERAL"
>&#60;presence/&#62;</TT
> element as an availability
indicator for connecting systems. Finally we'll combine the two features
(<TT
CLASS="LITERAL"
>&#60;message/&#62;</TT
> and the concept of 
<I
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>availability</I
>) to make the notification mechanism 
"sensitive" to the presence of the person being notified. </P
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