The architectural specification provides information about how DITA is designed. It is
divided into three sections: Base, technical content, and learning and training.
2.1 Architectural Specification: Base
Base DITA includes the topic, map elements, metadata, classification, and specialization elements. It also includes domains for hazard statement, typographic, and utility elements
2.2 Architectural Specification: Technical Content Version
Previously, the document types and specializations for technical content were included as an integral part of the base DITA specification. With the release of DITA 1.2 and the increasingly number of specializations that are part of the DITA specification, the document types and specializations for technical content have a dedicated section in the DITA specification.
2.3 Architectural Specification: Learning and Training Version
DITA 1.2 introduces the Learning and Training specialization, which is designed for developing instructional materials. It contains all of base DITA and some (but not all) parts of the Technical Content package.