Indexes Processors can generate indexes from the content of indexing elements. Index overviewDITA provides several elements to enable indexing. Whether and how an index is rendered will vary based on implementation decisions and rendering formats.Index elementsThe contents of <indexterm> elements provides the text for the entries in an index. <indexterm> elements can be nested to create additional levels of indexing, such as secondary and tertiary index entries. Location of indexterm elements<indexterm> elements can occur in topic prologs, anywhere else in DITA topics, and in DITA maps.Index locatorsAn <indexterm> element binds the content of the element, typically a term, to a specific location in a document.Index redirectionThe <index-see> and <index-see-also> elements enable redirection to other index entries within a generated index.Index rangesAuthors can use the @start and @end attributes on a pair of <indexterm> elements to index an extended discussion. The generated index entry reflects the span between the two <indexterm> elements. Index sorting The combination of an <indexterm> and a <sort-as> element specifies a sort phrase under which an index entry is grouped or sorted.Examples of indexingThis section contains examples and scenarios that illustrate the use and processing of indexing elements.Parent topic: DITA processing