
## 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** WWW: **http://www-ags.dfki.uni-sb.de**

## Editor Of Seki Series:

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