DITA incorporates powerful features for indexing, including multi-level indexing, and "see" and "see-also" redirection. Index entries can be applied in the ditamap, in the topic prolog, and inline within the topic content.

The indexing features in DITA are built around three elements: indexterm, index-see, and index-see-also. These elements can technically be placed at almost any point in the body of a topic, as well as in the topic prolog and in the topicmeta of the topicref in the ditamap. However, to avoid potential translation and processing complications, the elements should be deliberately placed in specific locations within the topic or map.