Managing hierarchies of components

摘要

Described are methods, systems, and apparatus, including computer program products for managing a hierarchy of modules. A user can select a first hierarchy or a second hierarchy, where the first hierarchy includes a module and a first sub-module. The module is associated with a component and the first sub-module is associated with a first sub-component of the component. The module is associated with the first sub-module using a first hierarchical reference of a first type. The second hierarchy includes the module and a second sub-module, where the second sub-module is associated with the first sub-component. The module is associated with the second sub-module using a second hierarchical reference of a second type that is different from the first type.