This contains the information for one indexed property in a BeanInfo - IndexedPropertyDescriptor, read method, and write method. This class is necessary because the read/write methods in the IndexedPropertyDescriptor may not be accessible if the bean given to the introspector is not a public class. In this case, a publicly accessible version of the method must be found by searching for a public superclass/interface that declares the method (this searching is done by the BeanInfoManager).