**3.6 Discussion**

Semantic Web technology is slowly modernizing the application of knowledge technologies, and though they existed before the Semantic Web, the implementation in their fullness is just being realized. Our actual research, materialized by WiDOP project relay on the above mentioned concept and technologies. In fact, this research benefits from the existing OWL languages, the existent inference engines through the inference rules and reasoning engines to reason the knowledge. However, the actual research works moves beyond semantic reasoning and semantic rule processing and attempts to implement new 3D processing and topological rule inference integrating the correspondent processing and topological built-Ins components in its structure to resolve the problem of object detection and annotation in 3D point clouds based on semantic knowledge.
