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To avoid repeating all the rights each time a new class of $ \frac {F}{\mathcal{R}}$ must be detailed, classes can inherit some rights, eitheir from their parent class (the class $ \overline{\psi\circ\psi_G(x)}$) or from a specified class. (See fig. [*])

Figure: Inheritance of the rights

Biondi Philippe 2000-12-15