From the DITA specification: "Task topics answer "How do I?" questions, and have a well-defined structure that describes how to complete a procedure to accomplish a specific goal. "
DITA concept topics answer "What is..." questions. Use the concept topic to introduce the background or overview information for tasks or reference topics.
Reference topics document programming constructs or facts about a product. Examples of reference topics include language elements, class descriptions, commands, functions, statements, protocols, types, declarators, operands, and API information, which provide quick access to facts, but no explanation of concepts or procedures. For instance for the SVN Client this is the command line:
