Key objects and relations in SIO. (A) Key SIO entities are objects, processes and their attributes (qualities, capabilities, roles, measurement values). Processes have objects as participants and may realize specific roles and capabilities. (B) Spatial and temporal qualification of SIO entities is captured through a set of relations (is located in, exists at) and sub-relations (e.g. is contained in, is part of, measured at), while (C) information in the form of literals (string, numbers, dates) are captured as instances of information content entities which are associated with their specific objects or processes.