Use:

compiledStylesheet = stf.newTemplates(new StreamSource(stylesheetPath));
Executable exec = ((PreparedStylesheet)compiledStylesheet).getExecutable();
IntHashMap map = exec.getCompiledGlobalVariables();
Iterator iter = map.valueIterator();
while (iter.hasNext()) {
Object var = iter.next();
if (var instanceof GlobalParam) {
String name = ((GlobalParam)var).getVariableName();
String value = ((GlobalParam)var).getSelectExpression().toString();

cheers
andrew

Cheers,
Abel