The Glossary object represents a glossary of terms in the printed and online documentation. It takes care of things like sorting terms, help definition pop-ups, and how the glossary is represented in both print and online documentation.
Any Topic objects placed one level below a Glossary object are considered to be glossary terms, and as such will be sorted alphabetically. You may have additional levels under the Glossary object. However, only the topics on the first level are treated as glossary terms.
When glossary terms are published to a printed document, they are automatically assigned Heading 5 style, regardless of what you have entered in the Document Heading Style property. Also, super header and section break information is ignored.