A computer-implemented system for facilitating communication between a plurality of building automation subsystems and a plurality of applications includes a first database storing a hierarchical model of a building automation system. The system further includes a messaging engine configured to receive a message from one of the disparate building automation subsystems and for one of the plurality of applications. The messaging engine is configured to use the information in the second database to transform the message into a standard format, to append the projected semantic type string to the transformed message, and to provide the transformed message to one of the plurality of applications.