Here is an example of a glossary list. The third item in the list has a regular, unordered list nested within it. Note that the first term (marked by the DT element) does not have a matching description (marked by the DD element). This is perfectly legal. You can also use BR elements to add extra line spacing, where desired -- here it is done after the first DT.
<P>, <ADDRESS>, <Hn>and so on. You should avoid the use of tab characters -- use single blank characters to space text apart.