1. A semantic sensing system comprising: a first sensing entity; a semantic engine coupled with the first sensing entity; a memory associated with the semantic engine, the memory storing a plurality of semantics; the memory further storing a plurality of rules comprising: a first semantic inference rule associating data from the first sensing entity with a first semantic; a second semantic inference rule for a composite semantic indicating that the composite semantic is a combination of the first and a second semantic; a plurality of access control rules, each of the plurality of access control rules associating at least one time interval and at least one semantic from among the plurality of semantics stored in the memory with an access control action; the semantic engine being configured to interpret the plurality of rules; the semantic engine further being configured to perform the access control action by: inferring the first semantic based on an input from the first sensing entity at a first time and the first semantic inference rule; determining the second semantic based on an external input; inferring the composite semantic based on the first and the second semantics and the second semantic inference rule; identifying a first access control rule from among the plurality of access control rules applicable to the composite semantic and performing the access control action associated with the first access control rule.