The AGI Common Entity Library is a set of objects designed for modeling high-volume real-time data. It is the base on which the Real-Time Framework and STK Object Broker are built. The two primary objects of the library are AgPointEntity and AgPolylineEntity, which are used to model points and shapes respectively. All other objects in the library are there to support this purpose. These objects have the capability to be extended with arbitrary data to allow for easy customization, so that they can be used for a variety of needs.