Fix profiling for the vrm element. Use chapter instead of mapref for the perspectives chapter.
Add collection-type="sequence" to all chapters. Remove format="ditamap" on map references (this is the default).
Whitespace changes only.
Group key definitions and add some comments (no content changes).
Indent the installation ditamap and move the uninstall topic to the last position.
Remove empty short description and a couple of small changes.
Remove product descriptions from the subject scheme map - the values are self explanatory.