Stylus Studio provides several tools that allow you to follow XSLT processing and detect errors in your stylesheets. To use these tools, you must use the processors displayed in the Debug and back-mapping enabled section of the Processors page on the Scenario Properties dialog box. These processors include Stylus Studio's XSLT processor, MSXML .Net, and Saxon 6 and 8. If you use the MSXML XSLT processor or some other XSLT processor, you cannot use the Stylus Studio debugging and backmapping tools.