RWTH Aachen University
Dereferencing a URI (Uniform Resource Identifier) returns a representation of the current state of the resource identified by that URI. But, on the Web representations of prior states of a resource are also available, for example, as resource versions in content management systems or archival resources in Web archives such as the Internet archive. This paper introduces a resource versioning mechanism that is fully based on HTTP (HyperText Transfer Protocol) and uses date time as a global version indicator. The approach allows "Follow your nose" style navigation both from the current time-generic resource to associated time-specific version resources as well as among version resources.