Generate topic stubs
This procedure generates topics from the elements in a map.
- The map must be locked.
- Navtitle attributes must be assigned to <topicref> elements.
- Type attributes must be assigned to <topicref> elements.
After you have inserted <topicref> elements
                and assigned each element a navtitle and type
                attribute, you are ready to turn these elements into topic stubs. 
        Note: If any of your elements do not have navtitle
                    attributes, you won't be able to start the generation process.