(ODA) - 3.1 , DWGdirect DGNdirect. 3.1 DWG, AutoCAD 2010, DWG DGN. (Neil Peterson), ODA, " 3.1 - DWG 2010. - , -. 3.1 ." ODA 3.1 , , . PDF- . (, DWGdirect ODA .) 3.1 ODA www.opendesign.com.