[ << label_name >> [ << label_name >> ] ...]
{ 
    assignment_statement
  | close_statement
  | execute_immediate_statement
  | exit_statement
  | fetch_statement
  | forall_statement
  | goto_statement
  | if_statement
  | loop_statement
  | null_statement
  | open_statement
  | open_for_statement
  | plsql_block
  | raise_statement
  | return_statement
  | sql_statement
}