Any transformer that offers an XQJ API implementation can be used when
validating XQuery or transforming XML documents.
If your XQJ Implementation is native, make sure the directory containing the native
libraries of the engine is added to your system environment variables: to PATH - on
Windows, to LD_LIBRARY_PATH - on Linux, or to DYLD_LIBRARY_PATH - on macOS.
Restart Oxygen XML Author Eclipse plugin after configuring the environment variables.