January 2002
Beginner
480 pages
13h 15m
English
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jabber:iq:roster
In Section 5.4.2.3 in Chapter 5,
we looked at the presence subscription mechanism
used to coordinate and record information about the relationships
between users and how they exchange availability information. This mechanism
revolves around certain types of <presence/>
elements and storage of information in the users’ rosters.
The roster structure is managed within the jabber:iq:roster
namespace. Clients make roster requests when they connect to the Jabber server,
to pull down the roster that is stored server-side. They also update
the roster to add, change, or remove entries. However, roster updates aren’t limited to just the client; there are certain attributes within each roster
item that are maintained by the server, in response to presence subscription
activity.
The roster in Example 6-5 contains five items. Three
are friends, grouped together using
<group>Friends</group>, which is used by clients to build the roster item display in a structured (hierarchical) way.
Example 6-5. A typical roster
<query xmlns='jabber:iq:roster'> <item jid='shiels@jabber.org' subscription='both' name='Robert'> <group>Friends</group> </item> <item jid='piers@jabber.org' subscription='both' name='piers'> <group>Friends</group> </item> <item jid='sabine@pipetree.com' subscription='to' name='Sabine'> <group>Friends</group> </item> <item jid='jim@company-a.com' subscription='from' name='Jim'> <group>Work</group> </item> <item jid='jim@company-b.com' subscription='none' ask='subscribe' ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.