Thoughts on using Pubsub with FIS

pubsub_fis.xml

<iq type="get" to="[email protected]/fis">
  <query xmlns="http://jabber.org/protocol/disco#items" node="urn:xmpp:fis:shares:0">
    <item jid="pubsub.example.com" node="file_share_1" name="Pictures" />
    <item jid="pubsub.example.com" node="file_share_2" name="Music" />
  </query>
</iq>

<iq type="get" to="pubsub.example.com">
  <pubsub xmlns="http://jabber.org/protocol/pubsub">
    <items node="file_share_1" />
  </pubsub>
</iq>

<iq type="result" to="[email protected]/myself">
  <pubsub xmlns="http://jabber.org/protocol/pubsub">
    <items node="file_share_1">
      <item id="foo/bar/baz.jpg">
        <file xmlns="urn:xmpp:fis:0"
              name="baz.jpg"
              size="1024"
              mime-type="image/jpeg"
              date="1969-07-21T02:56:15Z">
          <hash xmlns="urn:xmpp:hashes:1" algo="sha-1">552da749930852c69ae5d2141d3766b1</hash>
        </file>
      </item>
      <item id="foo/blah.jpg">
        <file xmlns="urn:xmpp:fis:0"
              name="blah.jpg"
              size="1024"
              mime-type="image/jpeg"
              date="1969-07-21T02:56:15Z">
          <hash xmlns="urn:xmpp:hashes:1" algo="sha-1">552da749930852c69ae5d2141d3766b1</hash>
        </file>
      </item>
    </items>
  </pubsub>
</iq>

<message to="[email protected]/myself" from="pubsub.example.com">
  <event xmlns="http://jabber.org/protocol/pubsub#event">
    <items node="file_share_1">
      <item id="foo/bar/meh.gif">
         <file xmlns="urn:xmpp:fis:0"
              name="blah.jpg"
              size="1024"
              mime-type="image/jpeg"
              date="1969-07-21T02:56:15Z">
          <hash xmlns="urn:xmpp:hashes:1" algo="sha-1">552da749930852c69ae5d2141d3766b1</hash>
        </file>
      </item>
    </items>
  </event>
</message>

<message to="[email protected]/myself" from="pubsub.example.com">
  <event xmlns="http://jabber.org/protocol/pubsub#event">
    <items node="file_share_1">
      <retract id="foo/bar/meh.gif" />
    </items>
  </event>
</message>