Abstract of FKI-175-93

Document-Name:  fki-175-93.ps.gz
Title:          Default Reasoning and the Qualitative Representation
                of Spatial Knowledge
Authors:        Daniel Hernandez 
                Kai Zimmermann 
Revision-Date:  1993/04/23
Category:       Technical Report (Forschungsberichte Künstliche Intelligenz)
Abstract:       This paper shows the close relationships between
                qualitative representations and default reasoning.
                These relationships are manifold: On the one hand,
                qualitative representations and defaults can be
                considered as alternate ways to cope with fuzzy or
                incomplete knowledge.  On the other hand, defaults and
                their associated revision mechanisms are also needed
                in the qualitative approach to handle the fact that
                they are inherently under-determined.  Furthermore, in
                the case of spatial representations the structural
                similarity between the representing and the
                represented worlds prevents us from violating
                constraints corresponding to basic properties of the
                represented world, which would otherwise have to be
                restored through revision mechanisms at great cost.
Keywords:       qualitative representation, default reasoning,
                constraint relaxation, topological relations,
                representation of spatial knowledge.
Size:           14 pages
Language:       English
ISSN:           0941-6358
Copyright:      The ``Forschungsberichte Künstliche Intelligenz''
                series includes primarily preliminary publications,
                specialized partial results, and supplementary
                material. In the interest of a subsequent final
                publication these reports should not be copied. All
                rights and the responsability for the contents of the
                report are with the authors, which would appreciate
                critical comments.


Gerhard Weiss