By João Leite, Andrea Omicini, Paolo Torroni, Pinar Yolum

This ebook constitutes the completely refereed post-proceedings of the second one overseas Workshop on Declarative Agent Languages and applied sciences, DALT 2004, held in ny, long island, united states in July 2004.

The sixteen revised complete papers awarded have been rigorously chosen in the course of rounds of reviewing and development from at the beginning round forty submissions. The papers are equipped in topical sections on reasoning, modeling and engineering, verification, norms and protocols, and interplay and communication.

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Additional info for Declarative Agent Languages and Technologies II: Second International Workshop, DALT 2004, New York, NY, USA, July 19, 2004, Revised Selected Papers

Sample text

The features of the world that undergo change Theories of Intentions in the Framework of Situation Calculus 21 are syntactically captured by fluents. For a fluent p, the successor state axiom Sp is of the form:1 (Sp ) p(do(a, s)) ↔ Υp+ (a, s) ∨ (p(s) ∧ ¬Υp− (a, s)) where Υp+ (a, s) captures exactly the conditions under which p turns from false to true when a is performed in s, and similarly Υp− (a, s) captures exactly the conditions under which p turns from true to false when a is performed in s.

So as a matter of simplification we assume that all the changes in the beliefs are of the type “update”. This assumption allows us to represent the generalised beliefs in terms of present beliefs as follows: Bi p(s , s) ↔ Bi p(s ). Automated reasoning in the situation calculus is based on a regression mechanism that takes advantage of a regression operator. The operator is applied to a regressable formula. Definition 2. A formula W is regressable iff 1. Each situation used as argument in the atoms of W has syntactic form do([α1 , .

This definition of intention, as Cohen and Levesque say, allows relating goals with beliefs and commitments. The action commit(T ) is an example of intentionproducing actions that affect the evolution of intentions. An advantage of this approach is that we can distinguish between a rational intention trigger by condition (1) after analysis of present and future situations, and an impulsive intention trigger by condition (3) after satisfaction of ΥIi+p (a, s) that may not concern any analysis process (for example, running intention after seeing a lion, the agent runs by reflex and not having reasoned about it).

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