Context data abstraction framework using RDF

Context data in context-aware ubiquitous systems usually have private information for customized services. Although access control systems may be used to prevent unpermitted subjects from accessing private data, it would also stop execution of useful customized services. To solve this problem, this paper suggests a method of abstracting context data which enables data owners to deliver less detailed information to data requesters. With a set of intelligent RDF schema, inference rule and negotiation document, it can avoid providing excessive data and can keep service continuity.