John Callahan

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Current Web-based application servers can be complex and monolithic because they must address a myriad of issues, including business logic, security, privacy, data integration, presentation, session management, caching, legacy integration, and database access within an overburdened object model. Component-based approaches (EJBs, etc.) help separate some of these issues, but a traditional firewall model can be used to filter, cache, and redirect digital content at a semantic level before and after processing by a back-end server. I introduce the notion of a content firewall (also known as a semantic firewall) to preprocess requests and postprocess responses at a semantic level using a series of intelligent XML transformations. By intelligent, I mean that a content firewall applies high-level rules to generate and apply XML transformations via dynamically generated XSL... (more)