Ontologies and Semantic Web for the Internet of Things - a survey

The reality of Internet of Things (IoT), with its growing number of devices and their diversity is challenging current approaches and technologies for a smarter integration of their data, applications and services. While the Web is seen as a convenient platform for integrating things, the Semantic Web can further improve its capacity to understand things' data and facilitate their interoperability. In this paper we present an overview of some of the Semantic Web technologies used in IoT systems, as well as some of the well accepted ontologies used to develop applications and services for the IoT. We finally present the Semantic Web Stack for the Internet of Things pointing out some of its shortcomings in the development of an IoT application or service.