Subscribing

When subscribing to a friend’s tag, the users’ own tag cloud is shown. This tag cloud is shown in the Figure below. The users have to select the tags to which their friend’s tag will be associated. A tag may be associated with one or more tags.

View Window - Subscribing

View Window - Subscribing

Let us suppose Nick associates Debbie’s Environment tag with his Science tag. Now every time Debbie publishes something tagged with Environment, these entries are automatically tagged with Science.

Thus, for users to share information, they don’t have necessarily to share the same concepts. All they have to do is to show how their friends’ concepts are associated with their own concepts. This is what tag links do. The Figure below shows Nick’s tag links. Debbie’s Environment tag is now associated with Nick’s Science tag. Since Nick is subscribed to Debbie’s tag, the color of the tag link is blue (incoming link). Outgoing tag links are in red.

Subscribe Window

Subscribe Window

Subscribing to Debbie’s Environment tag in XMPP:

<iq type='set' from='nick@iss.im'
to='debbie@iss.im' id='subscribing'>
<pubsub xmlns='http://jabber.org/protocol/pubsub'>
<subscribe node='environment' jid='nick@iss.im'/>
</pubsub>
</iq>