[Standards] Image preview in file transfer (XEP-0096)

[Detlev Casanova]

Hi all,
I would like to know if there is a way to send a preview of a file (in most 
cases, images) through the first stanza for the stream initiation.

Something like
<iq type='set' id='offer1' to='receiver at jabber.org/resource'>
  <si xmlns='http://jabber.org/protocol/si' 
      id='a0'
      mime-type='text/plain'
      profile='http://jabber.org/protocol/si/profile/file-transfer'>
    <file xmlns='http://jabber.org/protocol/si/profile/file-transfer'
          name='test.png'
          size='1022'>
    <preview>[Binary data]</preview>
    </file>
    <feature xmlns='http://jabber.org/protocol/feature-neg'>
      <x xmlns='jabber:x:data' type='form'>
        <field var='stream-method' type='list-single'>
        <option><value>http://jabber.org/protocol/bytestreams</value></option>
        <option><value>http://jabber.org/protocol/ibb</value></option>
        </field>
      </x>
    </feature>
  </si>
</iq>

This way, a preview of the file can be shown when the user is asked for the 
transfer.

In advance, thanks.

Detlev.
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