The year of a copyright of the book
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
...
<book-meta>
<book-id>...</book-id>
<book-title-group>
<book-title><italic>C. ELEGANS</italic> II
</book-title>
</book-title-group>
...
<publisher>
<publisher-name>Cold Spring Harbor Laboratory Press</publisher-name>
<publisher-loc>Plainview, NY</publisher-loc>
</publisher>
<permissions>
<copyright-statement>© 1997 Cold Spring Harbor Laboratory
Press</copyright-statement>
<copyright-year>1997</copyright-year>
<copyright-holder>Cold Spring Harbor Laboratory Press</copyright-holder>
</permissions>
<abstract>...</abstract>
</book-meta>
...
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