    <tr>
      <th>check.chaprefs</th>
      <td><p>(logical, default: <code>TRUE</code>) If <code>TRUE</code>, require all cross-references to use <code>\Chapref</code>.</p></td>
    </tr>
    </table>
    
    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p><code>NULL</code>, invisibly if labels check out. An error otherwise.</p>
    
    <h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

    <p>Checks each label has a prefix and 