e constraint solver ParCon [7]. 2 A graph structure signature is an algebraic signature according to [5] with unary operation symbols. 2 Bardohl, Schultzke, Taentzer The parsing algorithm proposed in =-=[2]-=- (which is based on Contextual Layered Graph Grammars (CLGG) and critical pair analysis) is now implemented using the Agg system, hence we call it Agg graph parser. In GenGEd we integrated the Agg gra