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asdf is designed in an object-oriented way from the ground up. Both a
system's structure and the operations that can be performed on systems
follow a protocol. asdf is extensible to new operations and to new
component types. This allows the addition of behaviours: for example,
a new component could be added for Java JAR archives, and methods
specialised on compile-op added for it that would accomplish the
relevant actions.
This chapter deals with components, the building blocks of a system, and operations, the actions that can be performed on a system.