The Darwin Core root namespace (http://rs.tdwg.org/dwc/) is currently used only for the latest version. Versions copies are also kept in version namespaces in the event that one would like to bind to a specific version.
http://rs.tdwg.org/dwc/dwcore
http://rs.tdwg.org/dwc/curatorial
http://rs.tdwg.org/dwc/geospatial
http://rs.tdwg.org/dwc/interaction
http://rs.tdwg.org/dwc/pollination