The Semantic Web is a machine understandable and processable web. The application of this technology towards improved search is highly desirable aand it is largely supported by semantic and syntactic reasoning capabilities that lies within the framework of the Semantic Web technology. Experts have been working towards technologies for the Semantic Web especially for the construction and execution of support knowledge-based applications. Although the introduction of ontologies and taxonomies provide enough context for search, however no one single ontology can sufficiently support and contain all definitions of a domian of knowledge. This book highlights how ontology mediation can be used to map accross different knowledge domains thus resolving all challenges for data sharing. A process methodology and framework coupled with business rules are introduced in this book which will be definately useful for ontologists or students who are considering to work or are already working in this area currently.