Page identifier for an article that does not have traditional page numbers; the value could be an article identifier, DOI, etc., for example, “E70”.
Text, numbers, or special characters.
<pub-date pub-type="pub">
<day>28</day>
<month>8</month>
<year>2002</year>
</pub-date>
<volume>2</volume>
<elocation-id>E27</elocation-id>
<lpage>10060</lpage>
<history>
<date date-type="accepted">
<day>22</day>
<month>8</month>
<year>2002</year>
</date>
</history>
common.ent