Relational and Kleene Algebraic Methods in Computer Science : 7th International Seminar on Relational Methods in Computer Science and 2nd International Workshop on Applications of Kleene Algebra Bad Malente Germany May 12 17 2003 Revised Selected Papers This book constitutes the thoroughly refereed joint postproceedings of the 7th International Seminar on Relational Methods in Computer Science and the 2nd International Workshop on Applications of Kleene Algebra held in Bad Malente Germany in May 2003. The 21 revised full papers presented were carefully selected during two rounds of reviewing and improvement. The papers address foundational and methodological aspects of the calculi of relations and Kleene algebra as well as applications of such methods in various areas of computer science and information processing