and they are completely interchangable.</p><p>Suppose you document a class with the <code>Class</code> keyword and a struct with <code>Struct</code>.&nbsp; They are both keywords for the Class topic type by default, so they will appear in the same index.&nbsp; If you wanted structs to have their own index, you would <a href="#AddingTopicTypes">add a topic type for structs</a> and <a href="#ChangingKeywords">change the <code>Struct</code> keyword to point to it.</a></p></div><div class=Topic><a name="AddingT