According to the epub spec a page number can be defined as:
<p>
…
<span epub:type="pagebreak" id="page23">23</span>
…
</p>
And in the page-list:
<nav epub:type="page-list">
<ol>
…
<li><a href="georgia.xhtml#page752">752</a></li>
…
</ol>
</nav>
Does the value of the page number need to be a integer value? In otherwords, will the following be valid:
<p>
…
<span epub:type="pagebreak" id="pagei">i</span>
…
</p>
Will this cause issues on any of the popular readers?