The classes in this package provide a standardized API for, as well as several basic implementations of, the classic Chain of Responsibility pattern that is described (most notably) in the "Gang of Four" design patterns book. For more information, see pages 223-232 of:

Gamma, Helm, Johnson, Vlissides, DESIGN PATTERNS:  ELEMENTS OF
    REUSABLE OBJECT-ORIENTED SOFTWARE, Addison-Wesley, 1995.