Figure 3.1: Library Development Procedure
The GNU PDF Library is composed by several layers. Each layer is in turn composed by several modules. The combination of the modules provide the functionality to layers. See Top.
The development of the library involves the design of the overall architecture (determination of the layers that composes the library), the development of each layer and the design and implementation of system tests.
The development of each library layer involves the design of the overall architecture of the layer (determination of the modules that composes the layer), the development of each module and the design and implementation of subsystem tests.
The development of each module involves the design of the API offered by the module and the architectural details, the definition of development tasks needed to complete the implementation of the module and the design and implementation of unit tests.
