If an author omits some content from the digital publication, or if we allow blank pages to be skipped, should the page list have gaps for the missing content or should we require all the source pages be listed?

For example, we could use a elements without an href attribute to represent omitted pages:

<ol>
   ...
   <li><a href="c02.html#page43">43</a></li>
   <li><a>44</a></li>
   <li><a href="c03.html#page45">45</a></li>
   ...
</ol>