Rekursion im MAD-Modell: Rekursivmoleküle als Objekte des Datenmodells

The molecule atom data-model (MAD model) supports the management of complex objects in a database. There are operations to retrieve, update, delete, and insert sets of dynamically defined objects. The object definitions may contain direct and indirect recursion. Thus, transitive closure computations are possible. In contrast to many proposals for the integration of recursion in a database system published earlier, the transitive closure together with its structure can be represented within the data model. Path problems can be solved by a choice of various aggregation and concatenation operators, which may be applied to the generalized transitive closure.