Historical figures as diverse as Buster Keaton, Abraham Lincoln, Amelia Earhart, Joe Louis, Jack Ruby, and Elvis Presley appear in the lyrical content.

An element particle similarly represents the relationship of a complex type and an element declaration, and indicates the minimum and maximum number of times the element may appear in the content.

Any changes that have already been made by the team appear in the content and are referenced with annotations.

This information is needed because some XML vocabularies allow qualified names (containing namespace prefixes) to appear in the content of elements or attributes, as well as in their names.