This is not easy to understand (at least for me :-) but interesting. A new outline level attribute will be introduce for paragraph.

This new attribut will range from 0 to 10, meaning that if a paragraph get the 0 value, it's body text. But if it get the 1 value, what will it be? a heading. This will have an impact on the status bar, the Navigator, the TOC and also on the Master Document creation. For more details and explanations, please read the specs or follow it on issue 70748.