[JDEV] Question on file transfer in Jabber

[Sokolov, Daniel]

Hi Everybody!

I am a novice to Jabber and I have faced the problem of how to implement the
binary file transfer in jabber. 

I have studied the documentation on Jabber and this mailing list and
understood that there is no standard solution for this problem. I understood
that there are three possible approaches to this problem:

1) To implement  "peer-to-peer" file transfer. 
2) To implement file transfer via an intermediate fileserver. One client
uploads a file on some server and notifies the second client. The second
client then downloads the file.
3) To "insert"  the file into the Jabber's XML protocol (possibly by means
of MIME)

Could anybody please answer my questions:
1) Are there any other possible solutions?
2) Is any of the above solution better or more standard than all the others?
3) Where can I find any information on implementing the file transfer in
jabber?

Thank you very much in advance.

Daniel Sokolov