The <topicgroup> element identifies a group of topics (such as a concepts, tasks, or
references) or other resources. A <topicgroup> can contain other <topicgroup>
elements, allowing you to express navigation or table-of-contents hierarchies, as well as
implying relationships between the containing <topicgroup> and its children. You can set
the collection-type of a container <topicgroup> to determine how its children are related
to each other. Relationships end up expressed as links in the output (with each participant in
a relationship having links to the other participants by default).
Insert Topic Group action from the main toolbar (or
from the Insert submenu of the contextual menu). Those actions open the Insert Topic Group dialog box that allows you to easily
insert a <topicgroup> element and various attributes can be specified (such as
Collection type, Type,
Scope, Format, etc.)