tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">error</code> <code class="type">text</code>
      </p>
      <p>
       If not <code class="literal">NULL</code>, an error message indicating why this
       line could not be processed
      </p></td></tr></tbody></table></div></div><br class="table-break" /><p>
   Usually, a row reflecting an incorrect entry will have values for only
   the <code class="structfield">line_number</code> and <code class="str