ev_document_class->get_n_pages = dvi_document_get_n_pages;
ev_document_class->get_page_size = dvi_document_get_page_size;
ev_document_class->render = dvi_document_render;
ev_document_class->get_n_pages = dvi_document_get_n_pages;
ev_document_class->get_page_size = dvi_document_get_page_size;
ev_document_class->render = dvi_document_render;