You can now retrieve a snapshot in time of the RDF or XSD serialization of a Concept/Scheme/Vocabulary by appending a ‘TimeSlice’ to the URI. For example:
http://metadataregistry.org/uri/NSDLEdLvl/ts/20060422200002.rdforhttp://metadataregistry.org/uri/NSDLEdLvl/ts/20060422200002.xsd
will always and forever retrieve the SKOS/RDF or XML Schema representation of the NSDL Ed Level Vocabulary as it appeared at 2 seconds after 8PM on April 22, 2006 (2006-04-22 […]