div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both"><a id="upgrade_4_0_txn"></a>txn_XXX</h2>
          </div>
        </div>
      </div>
      <p>The C API for the Berkeley DB Transaction subsystem was reworked in the 4.0
release as follows:</p>
      <div class="informaltable">
        <table border="1" width="80%">
          <colgroup>
            <col />
            <col />
          </colgroup>
          <thead>
            <tr>
              <th>Histo