Using an External DITA Open Toolkit in Oxygen XML Editor Eclipse plugin
Oxygen XML Editor Eclipse plugin comes bundled with a DITA Open Toolkit, located in the DITA-OT-DIR directory. If you want to use an external DITA-OT for all transformations and validations, you can open the Preferences dialog box and go to the DITA page, where you can specify the DITA-OT to be used.