</a>
          <ul>
            <li><a href="#hartmanns_samling">Hartmann's collection</a></li>
          </ul>
        </li>
        <li><a href="#structure">The structure of the entries</a>
        <ul>
          <li><a href="#work">The work concept</a></li>
          <li><a href="#identification">Identification</a></li>
          <li><a href="#titles">Work titles</a></li>
          <li><a href="#music">Instrumentation and incipits</a></li>
          <li><a href="#sources">Sources</a></li>
   