  plugin used.  An example plugin is provided in the PostgreSQL distribution.
   Additional plugins can be
   written to extend the choice of available formats without modifying any
   core code.
   Every output plugin has access to each individual new row produced
   by <code class="command">INSERT</code> and the new row version created
   by <code class="command">UPDATE</code>.  Availability of old row versions for
   <code class="command">UPDATE</code> and <code class="command">DELETE</code> depends on
 