1. A method of addressing a name space mismatch between content servers and content caching systems, comprising steps of: caching one or more content elements in a content caching system, wherein the cached elements are identified using a first identification format; automatically learning mappings between a second identification format and the first identification format; and using the mappings to update one or more selected cached content elements by requesting updated versions of the selected cached content elements from a content server, wherein each request identifies one of the selected cached content elements using the second identification format.