. "building envelope"@en . . _:b1 . _:b1 "2007-05-07" . _:b1 "fo" . _:b2 . _:b2 "fo" . _:b2 "2007-05-07" . "building envelope"@en . _:b4 . _:b4 . _:b4 _:b5 . _:b5 . _:b5 . _:b5 . _:b4 .