DogOnt is a novel modeling language for Smart Environments and IoT settings, based on Semantic Web technologies. By adopting well known representations such as ontologies and by providing suitable reasoning facilities, DogOnt is able to face interoperation issues allowing to describe: where a device is located; the set of capabilities of a device; the technology-specific features needed to interface the device; the possible configurations that the device can assume; how the building environment is composed; what kind of architectural elements and furniture are placed inside the environment.