<!ELEMENT era (#PCDATA) >
...
<date date-type="received" calendar="Japanese"
iso-8601-date="1947-07-01">
<day>1</day>
<month>7</month>
<year>22</year>
<era>昭和</era>
</date>
...
Journal Publishing Tag Library NISO JATS Draft Version 1.1d2
Version of December 2014