XSL / XSLT Debugger
XSLT Debugging Perspective Oxygen provides a special layout for the debugging mode. It displays the XML source and the XSLT stylesheet side by side, and also offers dedicated XSLT debugging views and toolbars. read more 
Debugging XSLT Stylesheets Oxygen offers XSLT debugging support based on the most commonly used XSLT processors, Xalan and Saxon . The debugging configuration can be re-used through debugging scenarios. read more 
Performance Profiling of XSLT Stylesheet Using the XSLT profiler feature is essential to helping you to save time identifying performance issues, ensuring that the XSLT transformation is more scalable and performs better. read more XSLT Unit Testing Oxygen provides XSLT unit testing support based on XSpec . You can easily create a test case scenario for XSLT stylesheets. read more 
