An architectural style defines as a family of such systems in terms of a（  ）of structural organization．More specifically， an architectural style defines a vocabulary of （  ）and connector types， and a set of （  ） on how they can be combined. For many styles there may also exist one or more （  ）that specify how to determine a system’s overall properties from the properties of its parts．Many of architectural styles have been developed over the years.
The best-known examples of（  ）architectures are programs written in the Unix shell.