Wikipedia,  the free encyclopedia, describes DITA as "an XML-based architecture for authoring, producing, and delivering technical information. The architecture and a related DTD and a W3C-Schema was developed by IBM ... Unlike book-oriented approaches that are based on chapters and pages, DITA uses topics - small chunks of information that can be easily reused across various contexts and deliverables. DITA also has built-in extensibility support, meaning you can customize document type definitions (or DTDs) without breaking compatibility with existing applications and processes. For these reasons and more, DITA goes beyond any previous approach in helping you overcome barriers to XML adoption, maximize content reuse, and reduce information redundancies..."