  In the field of ubiquitous computing, a class of applications called
context-aware services attracted great interest especially since the emergence
of wireless technologies and mobile devices. Context-aware application can
dynamically capture a range of information from its environment and this
information represents a context, the application adapts its execution
according to this context. An important challenge in ubiquitous computing is
dealing with context. Ontologies presents the most promising instrument for
context modeling and managing due to their high and formal expressiveness and
the possibilities for applying ontology reasoning techniques. In this paper, we
present an ontology based approach for the development of context aware
services.
