Creating plugin to send SMIL document

Hi everyone,

I'm quite a newbie when it comes to developing stuff, but as a part of a 
project I'm planning to develop a plugin that uses Exodus to send SMIL 
(semantic markup and integration language) documents (an XML namespace) 
between two or more clients. These SMIL documents are supposed to create 
a basis for developing a distributed scene with distributed content.

The Exodus Plugin should help me to manage a way of including (someway) 
the SMIL in the message body. Say I have a .smi/.smil file containing 
the SMIL-document. I then want to put this content into the message, 
pass the message from one Exodus client to another Exodus client, and 
make that other client extract the smil document from the message and 
create a new .smi/.smil file  ready to be read by a SMIL-player (I 
prefer Ambulant).

Could anyone please help me and tell me where to start? I'd like to use C++.

How do I create the plugin? Which classes should I implement? What 
functions could I use?

/SO