code: public void revokeOwnership(Collection<? extends Jid> jids) throws XMPPErrorException, NoResponseException, NotConnectedException, InterruptedException {
          changeAffiliationByAdmin(jids, MUCAffiliation.admin);
      }
docs: Revokes ownership privileges from other users. The occupant that loses ownership
  privileges will become an administrator. Room owners may revoke ownership privileges.
  Some room implementations will not allow to grant ownership privileges to other users.
  
  @param jids the bare XMPP user IDs of the users to revoke ownership.
  @throws XMPPErrorException if an error occurs revoking ownership privileges from a user.
  @throws NoResponseException if there was no response from the server.
  @throws NotConnectedException
  @throws InterruptedException