_:vb50820820 . _:vb50820820 . "PROV-XML: The PROV XML Schema" . "2013-04-30" . _:vb50820817 "Hook Hua" . _:vb50820818 "Curt Tilmes" . _:vb50820819 "Stephan Zednik" . _:vb50820820 . . . _:vb50820819 . _:vb50820818 . _:vb50820818 . _:vb50820819 . _:vb50820817 . . . _:vb50820817 .