The year of a copyright of the article
Since the <copyright-statement> element is intended for display, this element’s contents may not be displayed (but will be available for searching). The <copyright-year> element need not be used, if having the year as part of the <copyright-statement> (see <copyright-statement>) is sufficient.
This element (<copyright-year>) has been significantly remodeled in version 3.0 of the Tag Set. The values and/or usage in version 3.0 are not backward-compatible with that in previous versions of the Tag Set. Specifically, in prior versions the <copyright-year> element was allowed outside the <permissions> container element (although this was not best practice).
<!ELEMENT copyright-year (#PCDATA) >
Text, numbers, or special characters
<article> <front> <article-meta> <title-group>...</title-group> <contrib-group> <contrib contrib-type="author">... </contrib-group> <permissions> <copyright-statement>Copyright © 1999, British Medical Journal</copyright-statement> <copyright-year>1999</copyright-year> <copyright-holder>British Medical Journal</copyright-holder> </permissions> <abstract> <p>To examine the effectiveness of day hospital attendance in prolonging independent living for elderly people.</p> </abstract> </article-meta> ...