Theory and Application of Graph Transformations : 6th International Workshop TAGT’98 Paderborn Germany November 16 20 1998. Selected Papers This book constitutes the thoroughly refereed post workshop proceedings of the 6th International Workshop on Theory and Applications of Graph Transformations held in Paderborn Germany in November 1998. The 33 revised full papers presented in the book were carefully reviewed and selected from a total of 55 papers presented at the meeting. The book addresses all current aspects in the area. The papers are organized in sections on graph languages graph theory categorical approaches concurrency and distribution artificial intelligence visual languages specification concepts modularity and refinement and software engineering