Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt|Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt|Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt|Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt|Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt|Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt|Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt|Department of Informatics/CCTC, University of Minho, Braga, Portugal. mrocha@di.uminho.pt