<copyrfirst>
The <copyrfirst>
element contains the copyright year, or the first copyright year
within a multiyear copyright statement.
See appendix for information about this element in OASIS document type shells.
- topic/data bookmap/copyrfirst
See the example in bookmap.
The following attributes are available on this element: Data element attributes group, Link relationship attribute group, Universal attribute group, and outputclass.