<copyrfirst>
The <copyrfirst> element contains the copyright year, or the
first copyright year within a multi-year copyright statement.
Specialization hierarchy
The <copyrfirst> element is specialized from
<data>. It is defined in the bookmap module.
Attributes
The following attributes are available on this element: data-element attributes, link-relationship attributes, and universal attributes.
Example
See the example in bookmap.