... <month>01</month> <year>2001</year> ...
<!ELEMENT string-date (#PCDATA %string-date-elements;)* >
(#PCDATA | day | era | month | season | year)*
...
<ref id="B12">
<label>[12 Lapeyre]</label>
<element-citation>
<string-name>Rene Lapeyre du Fontclaire Carnu, IV</string-name>
<article-title>Foraminifera of the Lower Hellstooth</article-title>
<source>Local Paleo</source>
<string-date iso-8601-date="1924">Some time before
<year>1924</year></string-date>
<publisher-loc>Rockville, MD</publisher-loc>
</element-citation>
</ref>
...
Journal Publishing Tag Library NISO JATS Draft Version 1.1d2
Version of December 2014