There are three copyright elements which may be contained in the <permissions> grouping element:

• <copyright-statement>, which is the textual statement of the copyright intended for print and display (The full statement usually contains the copyright holder’s name and the year among other information.);
• <copyright-year>, a metadata element that names just the copyright year (This is intended for metadata searching and aggregation and is typically not displayed.); and
• <copyright-holder>, also a metadata element that is typically not displayed.

This Tag Set includes several date elements. For the date of publication of a book (metadata) use the element <pub-date>. For the copyright date of a book (metadata) use the copyright year element <copyright-year>. The <date> element is be used for dates concerning a book or book part’s publication history such as the date last updated (also metadata). For the publication date of a cited work in a bibliographic reference <mixed-citation> or <element-citation>, use the individual elements <month>, <day>, and <year>. If no month or month/day construction is given within a <mixed-citation> or <element-citation>, and the only date is a season or a textual form of the date, such as “Third Quarter”, use the <season> element inside the <mixed-citation> or <element-citation> element.