Main enhancements:
- Much improved DITA map and DITA bookmap configurations.
- The "Document Set" tool, which has been renamed to "Navigation Pane", is now more convenient to use.
- It's now possible to move the text or node selection within a document using drag and drop.
- New CSS extension property
tooltip-contentis used in the XHTML and DocBook CSS stylesheets to display the target of internal and external links.