Exception: Senses (not sub-entries)
Headings that begin with a number or Roman numeral are senses of the main headword and are not sub-entry headwords.
Example
XML
<e id="acref-9780195300826-e-0036" doi="10.1093/acref/9780195300826.013.0036">
<headwordGroup>
<headword>Aigina</headword><altHeadwordGroup>[<headword>Aegina</headword>]</altHeadwordGroup>
</headwordGroup>
<section role="main"><textMatter>
<div1>
<p>Greek island in the Saronic Gulf of the...</p>
<div2>
<titleGroup>
<title>
<p>1. <sc>Bronze Age</sc>.</p>
</title>
</titleGroup>
<p>An important factor in the prehistory of...</p>
</div2>
<!-- content skipped for brevity -->
</div1></textMatter>
</section>
</e>