Map group elements
The map group domain elements define, group, or reference content. Many of the map group elements are convenience elements, which means that they simply make it easier for an author to make use of existing functions.
For example, the topichead element allows a map to specify a heading without allowing a reference to a topic. While a topicref element might accomplish the same thing by creating a title and leaving off the href attribute, the topichead element simply makes the intent clearer and prevents the accidental inclusion of an href attribute.
Parent topic