BFO

Top-level Ontology (Continuant vs. Occurrent).

Middle-Level Ontologies

• SOSA

  Sensor, Observation, Sample, and Actuator ontology.

• GeoSPARQL

  Geospatial vocabulary for representing spatial geometry.

• OWL-Time

  Temporal concepts, intervals, instants.

• WoT

  Web of Things metadata and models.

• SAREF

  Smart Applications REFerence ontology for IoT devices and services.

IoDT²

Our core domain ontology for city/administrative areas, building & construction, earthquake modeling, transport systems, sensor observations, advanced relationships, cardinalities, etc.