Indexes Processors can generate an index from the content of indexing elements. Index elementsThe content of <indexterm> elements provides the text for the entries in a generated index. <indexterm> elements can be nested to create 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 locatorsTypically, an <indexterm> element instructs a processor to generate an index entry with a locator.Index redirectionThe <index-see> and <index-see-also> elements enable redirection to other index entries within the generated index.Index rangesAuthors can use the @start and @end attributes on <indexterm> elements to index extended discussions. Processors generate index entries that range over several locators. Index sorting The combination of an <indexterm> and <sort-as> element specifies a sort phrase under which an index entry is sorted.Merging index elementsProcessors merge indexing elements in order to construct the effective index for a publication.Examples of indexingThis section contains examples and scenarios that illustrate the use and processing of indexing elements.Parent topic: DITA processing