A title is not the same as a heading. A topic, a figure, a table and a section should each have only one title.

The intention of the DITA approach is that the elements most commonly cross-referenced, such as topics, sections, figures and tables, should have a title. In some cases, the title element is mandatory.

Even though the DITA DTD may technically allow multiple titles to exist in one section, you should limit your section content to one title. Do not use titles as though they are headings. If you need multiple headings in a section, chances are that you really need multiple sections.