1. Department of Computer SciencesUniversity of SalzburgJakob Haringer Strasse 2 5020SalzburgAustria
2. Department of Computer SciencesFederal University of Tocantins109 Norte, Av. NS 15, ALC NO 14PalmasBrazil
3. IS‐Lab/CAISRHalmstad UniversityBox 823, Halmstad SE 301‐18Sweden