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Defines possible values for annotations tabs order.
AnnotationsArrayOrder: 3;
Annotations array order. This order refers to the order of annotation in the PdfPage#annotations collection.
ColumnOrder: 1;
Column order.
RowOrder: 0;
Row order.
StructureOrder: 2;
Structure order.
WidgetOrder: 4;
Widget order. This order uses the same ordering as AnnotationsTabsOrder#AnnotationsArrayOrder, but two passes are made, the first only picking the widget annotations and the second picking all other annotations.