Abstract
The concept of cooperation and distribution as known from the area of grammar systems is introduced to graph grammars; more precisely, to hyperedge replacement (for short, HR) grammars. This can be seen as a modest approach to controlled HR. Two different derivation modes are considered, the so-called t-mode and the =k-mode. For the t-mode it is shown that the class of hypergraph languages obtained is equal to the class of ET0L HR languages which is a natural generalization of the class of ET0L languages to hypergraphs.
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