(第1空)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.