if(parentContentHandler.getNestedContentHandler() != null) {
throw new SmooksException("Illegal use of more than one nested content handler fired on the same element.");
}
SmooksContentHandler nestedContentHandler = new SAXHandler(nestedExecutionContext, element.getWriter(this), parentContentHandler);
DynamicSAXElementVisitorList.propogateDynamicVisitors(executionContext, nestedExecutionContext);
// Attach the XMLReader instance to the nested ExecutionContext and then swap the content handler on
// the XMLReader to be the nested handler created here. All events wll be forwarded to the ..