[oXygen-user] Validate schema programatically?

I have a RelaxNG schema I've created for use in one of my Java projects. The schema works the way I want it to, and I've created a couple of sample documents in oXygen that validate against it nicely. Now, I need to write a unit test to validate a test document. It appears that Java 1.5 does not directly support RelaxNG, so I can't use the method as described at http://java.sun.com/developer/technicalArticles/xml/validationxpath/ . Can I do command line validation of a document with oXygen? I'm assuming maybe a batch file that uses oXygen's libraries? Thanks.