. _:vb50821466 "Mark Birbeck" . _:vb50821469 . _:vb50821466 . _:vb50821467 . _:vb50821469 . _:vb50821468 "Ivan Herman" . _:vb50821465 . "RDFa Core 1.1 - Third Edition" . _:vb50821468 . _:vb50821468 . _:vb50821467 . . _:vb50821466 . . _:vb50821465 . "2015-03-17" . . _:vb50821467 "Shane McCarron" . _:vb50821465 "Ben Adida" . . . . _:vb50821469 .