Full list of XML values for presence plugin

Hi there, can anyone point me in the direction of a list of XML values that can come from the presence plugin?

So far I’'ve seen:

presence type=“unavailable”

presence from=“ID/JabberFoX”

presence type=“error” … forbidden

the presence from=“ID/JabberFoX” one is the most confusing. I presume it just means the user is online, using the JabberFox client.

Is there definitive list of what can come back from the presence plugin via xml? I’'m querying it automatically from a VLE to find out if VLE users are also logged in to chat.