Abstract
Selective substitution grammars first introduced by Rozenberg are further investigated. In particular we study `context-free grammars' with selection, since the original model is too general in its generative power. It is shown how the families of context-free, EOL and ETOL languages can be characterized by selective context-free grammars. Further the effect of linguistic restrictions on the family of selection languages is investigated. Finally, the notion of a universal grammar is investigated in this framework, demonstrating the existence of selection universal grammars under weak conditions on the selection family.
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