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Content integration of Web data sources is becoming increasingly important for the formation of the next generation information systems. A common performance bottleneck faced by all proposed solutions is the network overhead incurred when contacting the integrated e-sites. With this paper we contribute ongoing work on D.I.C.E. and Co.In.S.; a domain-independent content integration system and its data integration cache engine. DICE constitutes a cache engine utilizing novel techniques for operating as a fully active semantic cache. We show how our contributions can be applied in the field of content integration in order to improve the response time of content integration systems, representative of a large class of e-commerce applications. We have implemented the proposed architecture and are currently developing a number of applications.