Topics are the building blocks of modular documents, and
organising topics by semantic information types is one of the architectural
features of DITA.
Information is not knowledge. Knowledge is not
wisdom. Wisdom is not truth.
Content models and information types
A content model is a framework that represents the structure of the information to be stored. In DITA, a content model is implemented as an information type, or topic type.
A fundamental principle of DITA is information typing, which categorises information according to the nature of the content. The three base DITA information types are concept, task and reference.
What is a topic?
A topic in DITA is an independent chunk of information covering a single idea or task, authored as a unit, and stored in its own file. Topics are categorised by information type. DITA's topic-based architecture enables the same topic to be used in different publications.