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> ...