The <topichead> element provides a title-only entry in a navigation map, as an
alternative to the fully-linked title provided by the <topicref> element.
Insert Topic Heading
action from the main toolbar (or from the Insert submenu of the
contextual menu). Those actions open the Insert Topic Head dialog box that allows you to easily
insert a <topichead> element. A Navigation title
(@navtitle attribute) is required but other attributes can also be specified
from this dialog box (such as Type, Scope,
Format, etc.)