In this ePub3-format hypertext ebook, the index is an organizing system that presents an alphabetical arrangement of terms to enable lookup and discovery of corresponding subject matter, selectable with hypertext links designed to lead the reader to a term’s first use, its definition or a featured mention within the content.
When an index term’s referent is a paragraph or phrase located within the main flow of text, the number and title of its parent section are offered as the link anchor text. When an index term’s referent is a section, sidebar, figure, table, or example, then its label is offered as the link anchor text. When an index term’s referent is a footnote, then a footnote call marker is offered as the link anchor text.
Due to variation in aesthetic factors such as font size and multi-column layout, and engineering factors such as interpretation and implementation of standards, it is impossible to predict whether or how ebook readers will implement the hypertext links that we intended to present to you.
Although we cannot predict exactly how your book reader will present or resolve those links, we can explain our intent, by way of an example. The entry for AACR2 immediately below, has two referents: the first connects to the 3rd paragraph of §18.104.22.168, “Scope, Scale, and Resource Description”, immediately following endnote208[LIS]; and the second referent connects to the AACR2 entry in the glossary.
Our intent is for this Index to be a useful discovery interface. ...