Publications in Scientific Journals:

T. Eiter, W. Faber, N. Leone, G. Pfeifer, A. Polleres:
"A Logic Programming Approach to Knowledge-State Planning, II: The DLVK System";
Artificial Intelligence, 144 (2003), 1; 157 - 211.

English abstract:
In Part I of this series of papers, we have proposed a new
logic-based planning language, called K. This language facilitates
the description of transitions between states of knowledge and it is
well suited for planning under incomplete knowledge. Nonetheless, K
also supports the representation of transitions between states of the
world (i.e., states of complete knowledge) as a special case, proving
to be very flexible. In the present Part II, we describe the DLVK
planning system, which implements Image on top of the disjunctive
logic programming system DLV. This novel planning system allows for
solving hard planning problems, including secure planning under
incomplete initial states (often called conformant planning in the
literature), which cannot be solved at all by other logic-based
planning systems such as traditional satisfiability planners. We
present a detailed comparison of the DLVK system to several
state-of-the-art conformant planning systems, both at the level of
system features and on benchmark problems. Our results indicate that,
thanks to the power of knowledge-state problem encoding, the DLVK
system is competitive even with special purpose conformant planning
systems, and it often supplies a more natural and simple
representation of the planning problems.

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