Use the concept topic to introduce the background or
overview information for tasks or reference topics. The concept topic has
the restriction that following a section or example, only other sections or
examples are permitted as content.
concept
The <concept> element is the top-level element for a topic that answers the question what is? Concepts provide background information that users must know before they can successfully work with a product or interface. Often, a concept is an extended definition of a major abstraction such as a process or function. It might also have an example or a graphic, but generally the structure of a concept is fairly simple.
conbody
The <conbody> element is the main body-level element for a concept. Like the <body> element of a general <topic>, <conbody> allows paragraphs, lists, and other elements as well as sections and examples. But <conbody> has a constraint that a section or an example can be followed only by other sections or examples.