The XMPP protocol

Is there a Time Stamp in the Message?

Do you know whether the message protocol provide date Stamp in its message XML format?

Can't seem to find it specific in the Jabber doc, does that mean for message send, there will be no way to trace the sent date of the message?

Offline messages are stored (in the XML files on the HD) with the time stamp; it is then a feature of the client to show this information. Online messages do not have (obviously) the time stamp.

Priority tag for routing messages with the highest priority?

I notice in the Presence packet, there is a priority attribute for routing messages with the highest priority (Does TIMP have this implementation?). Wonder why this is not included in the Message packet as well?

The priority attribute in the presence packet is a Jabber feature.

Jabber allows you to connect with the same username and the same password several times.

Each sessions of a single user is identified by a resource and a priority:
a "buddy" can address a message to particular resource specifying a to="user@server/resource".

If the message is like "user@server", the server delivers the message to the highest priority resource (==user session).