PlaceTime.com is intended to be a URI space containing URIs that represent places and times.These URIs can serve as common identifiers for a wide variety of applications such as genealogical research or calendaring.
This paper describes the crisis of identity facing the World Wide Web and, in particular, the RDF community. It shows how that crisis is rooted in a lack of clarity about the nature of "resources" and how concepts developed during the XML Topic Maps effort can provide a solution that works not only for Topic Maps, but also for RDF and semantic web technologies in general.