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Using configurable caching rules, Oracle9iAS Web Cache can cache static, dynamic, and partial pages. Oracle9iAS Web Cache supports the new Edge Side Includes (ESI) standard. ESI and JESI (ESI for Java) are a set of XML and JSP tags that application developers use to identify content fragments for dynamic caching and page assembly in Web servers. ESI uniquely identifies common elements that different, personalized Web pages share, and Oracle9iAS Web Cache only caches or invalidates one copy of each element. This saves resources across all layers of a Web site.