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Oxygen XML Editor offers an add-on that installs an external Saxon XSLT and XQuery processor and allows you to validate and transform XSLT and XQuery documents with that external processor. The default add-on update site includes versions for Saxon 9.6, 9.7, 9.8, and 9.9.

To install it the add-on, follow these instructions:
  1. Go to Help > Install new add-ons to open an add-on selection dialog box.
  2. Enter or paste https://www.oxygenxml.com/InstData/Addons/default/updateSite.xml in the Show add-ons from field or select it from the drop-down menu.
  3. Select one of the versions of the Saxon XSLT and XQuery Transformer add-on (9.6, 9.7, 9.8, or 9.9) and click Next.
  4. Select the I accept all terms of the end user license agreement option and click Finish.
  5. Restart the application.
Result: When you configure the validation or transformation scenario, you will now have the option to choose the particular Saxon transformer.
Restriction: Debugging XSLT/XQuery transformations based on this engine is NOT supported.