delete from /univ_demo/org with version /** onerror(continue,`not exist`,`not find`,`not found`) **/ ; delete from /univ_demo/person with version /** onerror(continue,`not exist`,`not find`,`not found`) **/ ; drop class if exists /univ_demo/org ; drop class if exists /univ_demo/person ; drop class if exists /univ_demo ; drop edge type univ_demo.person_to_org ;