/// <summary>parent: DATA DIVISION</summary>
 /// <param name="context">WORKING-STORAGE SECTION</param>
 public override void EnterWorkingStorageSection(ProgramClassParser.WorkingStorageSectionContext context)
 {
     var terminal = context.WorkingStorageSectionHeader();
     var header = terminal != null? (WorkingStorageSectionHeader)terminal.Symbol : null;
     Enter(new WorkingStorageSection(header), context);
 }