
## This Seki-Working-Paper Was Internally Reviewed By:

Jörg Siekmann FR Informatik, Universität des Saarlandes, D–66123 Saarbrücken, Germany E-mail: siekmann@ags.uni-sb.de WW: http://ww-ags.dfki.uni-sb.de

## Editor Of Seki Series:

Claus-Peter Wirth Brandenburger Str. 42, D–65582 Diez, Germany E-mail: wirth@logic.at W: http://ww.ags.uni-sb.de/~cp