Contributing author: IBM
Date: August 8, 2006
The DITA architecture supports the proper construction of specialized DTDs from any higher-level DTD or schema. The base DTD is ditabase, which contains an archetype topic structure and three peer topics that are typed specializations from the base topic, concept, task, and reference. The principles of specialization and inheritance resemble the principle of variation in species proposed by Charles Darwin, so the name is reminiscent of the key extensibility mechanism inherent in the architecture.