Represents an object with an associated introspectable class.
Used for Ant elements which are matched to some Java class
(e.g. for a task or for a subelement).
Similar in concept to InstanceCookie; however InstanceCookie
requires the cookie to be able to load the actual class and
instantiate it (which is not always possible from these elements)
and also does not provide a way to get the class name without
loading the class (which is useful from these elements).
IntrospectedInfo can be used to look up introspection results from
the resulting class name.