1 level-number 2? 2 data-name-1 2 FILLER 3? redefines-clause 4? blank-when-zero-clause 5? external-clause 6? global-clause 7? group-usage-clause 8? justified-clause 9? occurs-clause 10? picture-clause 11? sign-clause 12? synchronized-clause 13? usage-clause 14? value-clause 15? date-format-clause