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.
Subj3ct is a registry and clearinghouse service for subject identifiers for the Semantic Web. Our goal is to provide the functionality that we believe is required to realize the vision of the Semantic Web or Web 3.0. Using the Subj3ct portal and APIs it is possible to register XML feeds that provide information and identifiers for the concepts that you or your applications are interested in and to connect your identifiers with other identifiers created by other people for the same concepts.
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.