Changes from previous versions

B.2.1 Changes from DITA 1.2 to DITA 1.3
DITA 1.3 adds a number of new features and refinements to DITA.

B.2.2 Changes from DITA 1.1 to DITA 1.2
DITA 1.2 added a number of new features to DITA, including indirect addressing using map-defined keys; the ability to define content-model constraints for DITA document types; specializations for learning content and the machine industry; and taxonomies, ontologies, and controlled vocabularies. Other refinements include extended markup for glossaries and terminology.

B.2.3 Changes from DITA 1.0 to DITA 1.1
The DITA 1.1 specification was designed to be backwards-compatible with applications that conform to the DITA 1.0 specification.

B.2 Changes from previous versions