Progress in artificial intelligence : 11th Portuguese conference on artificial intelligence, EPIA 2003 : Beja, Portugal, December 4-7, 2003 : proceedings. : ALEA -- workshop on artificial life and evolutionary algorithms : CLPS -- workshop on constraint and logic programming systems : EKDB -- workshop on extraction of knowledge from data bases : MAAII -- multi-agents and AI for the internet : NLTR -- natural language and text retrieval : Dec 2003, Beja, Portugal