In FM you can define namespaces to import functions into. Certain frameworks like Struts 2 / WW imports all the JSP tag libs under a given namespace. This pretty much means that you don't really know what variables are actually available to the tag. All attributes of this tag is marked as a warning. I'd assume it'd be hard to resolve all the properties, so an easier solution is to be able to configure somewhere to "Ignore property warnings" for "ww" namespace.