Full stepping capability. New Step-over, Step out of, Step backward, Run to end and Restart capabilities. Stepping into included/imported stylesheets. Infinite recursion detection and maximum limit recursion checking (and debugging up to recursion point). Debug to error position - allows debugging to continue even when some critical errors are encountered. Breakpoints on both XSLT and input XML. Conditional breakpoints. View template call stack. Watch values (including full XPath expression watches). Optional stepping into built-in rules. Uses MSXML3 transformations (so that debugging session behavior matches a real, production environment transformation engine).