An ontology model for spatio -temporal information in OWL

1. TimeSliceOf Employee Timeslice TimeSliceOf TimeInterval Time Interval After Time Interval TimeInterval string Employee Timeslice Location LocatedAt Location Name www.intelligence.tuc.gr Employee CompanyTimeSlice Company Employs TimeSliceOf Company Name Employee Name int Starts string string int Ends Static properties Dynamic properties • An ontology model for spatio-temporal information in OWL • For quantitative and qualitative information • SOWL is based on the 4-D fluents approach enhanced with reasoning support over qualitative Allen (e.g., “before”, “after”) relations. • RCC-8topological (e.g., “into”) and Directional (e.g., “North of”) qualitative relations • Reasoning rules are embedded into the ontology using SWRL • Temporal Rules apply on Allen relations between time intervals • Spatial Rules apply on RCC-8 topologic and directional spatial relations between locations • Rules apply using standard OWL reasoners supporting SWRL DL-safe rules, e.g. ,Pellet • Example: During( x, y) Meets( y, z) Before( x, z) • Spatiotemporal reasoning is tractable • Representation is decidable • SOWL query language is SQL – like: SELECT <object/class property> FROM <class> WHERE <condition> AT <time point/interval> <spatial operator> <location>