. . . . . "2010-11-08" . . . . "2 June 2017" . "&wdrs;" . . . . . . . . . "POWDER-S Vocabulary" . . . . "This file specifies the set of classes and properties used in the RDF/OWL version of POWDER documents." . . . . . "2017-06-02" . "wdrs" . . "2009-09-01" . .