Oxygen XML Author Eclipse plugin includes a built-in transformation scenario that is designed to convert DocBook content to DITA. This transformation scenario is based upon a DITA Open Toolkit plugin that is available at sourceforge.net.
Apply
Transformation Scenario(s) (Alt + Shift +
T, T (Command + Option + T, T on macOS)) action from
the toolbar or the XML menu.
Configure Transformation Scenario(s) (Alt + Shift +
T, C (Command + Option + T, C on macOS)) action from
the toolbar or the XML menu.Click the Apply associated button to run the transformation.
Step Result: The transformation will convert as many of the DocBook elements into equivalent DITA elements as it can recognize in its mapping process. For elements that cannot be mapped, the transformation will insert XML comments so that you can see which elements could not be converted.